---
product_id: 510165143
title: "TPT-SP4BT Bluetooth DSP 4 Output Channel- Full Digital Signal DSP Car Audio Processor - Built-in Voltmeter and Remote Relay"
brand: "timpano"
price: "€ 148.32"
currency: EUR
in_stock: true
reviews_count: 9
category: "Timpano"
url: https://www.desertcart.it/products/510165143-tpt-sp4bt-bluetooth-dsp-4-output-channel-full-digital-signal
store_origin: IT
region: Italy
---

# Bluetooth DSP control Built-in voltmeter & remote relay 4 output channels EQ & crossover TPT-SP4BT Bluetooth DSP 4 Output Channel- Full Digital Signal DSP Car Audio Processor - Built-in Voltmeter and Remote Relay

**Brand:** timpano
**Price:** € 148.32
**Availability:** ✅ In Stock

## Summary

> 🎵 Elevate your ride’s sound game — control, clarity, and power in your pocket!

## Quick Answers

- **What is this?** TPT-SP4BT Bluetooth DSP 4 Output Channel- Full Digital Signal DSP Car Audio Processor - Built-in Voltmeter and Remote Relay by timpano
- **How much does it cost?** € 148.32 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.it](https://www.desertcart.it/products/510165143-tpt-sp4bt-bluetooth-dsp-4-output-channel-full-digital-signal)

## Best For

- timpano enthusiasts

## Why This Product

- Trusted timpano brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Low-Noise Differential Inputs:** Experience crystal-clear sound with minimized ground loop noise, even in complex aftermarket or factory setups.
- • **Seamless Bluetooth DSP Control:** Optimize your car audio system wirelessly from your phone or tablet with the dedicated Timpano app for iOS and Android.
- • **Advanced Limiter & Tuning Tools:** Protect your speakers and amps with a half-wave averaging limiter and fine-tune your system using built-in frequency generators and pink noise.
- • **Smart Sequencer Startup & Shutdown:** Automate power management of up to three connected devices remotely, enhancing system integration and convenience.
- • **Precision 4-Channel Audio Processing:** Individually adjust equalization, crossover filters, gain, phase, and routing for a perfectly balanced soundstage.

## Overview

The Timpano TPT-SP4BT is a compact, Bluetooth-enabled 4-channel digital signal processor designed for car audio enthusiasts who demand precise sound tuning. It offers real-time wireless control via a smartphone app, advanced equalization, crossover, gain, and phase adjustments, plus a built-in voltmeter and remote relay for seamless system management. Its low-noise differential inputs and smart sequencer features make it ideal for upgrading factory or aftermarket audio systems, delivering professional-grade sound optimization at a budget-friendly price.

## Description

Product description The processor’s information can be viewed and configured remotely using smartphones with Android or iOS systems. Its digital signal processor allows real-time modification of equalization, crossover filters, alignment, gain control, phase inversion, limiter, input/output routing, and features such as: Battery Voltmeter, Frequency Generator, Frequency Sweep and Pink Noise. The compact TPT-SP4BT is signal processor (DSP) controlled by bluetooth connection direct from your phone or tablet. This powerful tool allows users to optimize the performance of their custom sound system, regardless of whether they are using a aftermarket unit or factory radio. In your device’s app store (Play store) or (Apple Store), search for our Timpano TPT-SP4BT app. Once installed, open the app to configure and use your audio processor. Our crossovers are designed to provide the perfect frequency distribution to ensure the clarity and peak efficiency throughout your custom system. Bluetooth Car Audio Signal Processor DSP – TPT-SP4BT

Review: Great Device at this Price - I bought the Timpano DSP mostly as a limiter because I was not satisfied with a competing product. The Timpano has a lower input noise and wider dynamic range. It should do a great job for most applications if you understand how it works. Adjusting it is not really for beginners, so for those new to this please keep an open mind that you may discover things you didn't know and may need to seek out an expert or do some research. You need some supporting tools to do this and even with tools, expect to take some time to optimize things. You don't want to "wing" it or tune by ear or you won't get everything that your system is capable of and you could waste a lot of time. Before going through the tuning process here are some important features of the Timpano: Low cost Light plastic case with simple 2-fastener mounting. Low profile and small size Free Bluetooth app which worked perfectly with my Samsung Android phone The RCA inputs are semi-floating, low noise, differential inputs (nice!) The "high" or Spr input is also differential and attenuated by 20dB and has a 1K impedance. Up to 15dB gain Limiter threshold is based on signal's 1/2-wave rectified average value, referenced to the full output. Full output (0dB) is about 5.6vpp or +8dB VU. There was a gradual drop in output above 12KHz but this can be managed with the EQ. Power supply rejection is as good as most other equipment but be sure to feed it clean power. The "auto" settting of the limter is 100mS attack and "1600mS" release - but please see below. The EQ is applied at the input and affects all outputs There are separate adjustable parametric filters for the individual ouputs, before the limiter. The unit's best feature is the low noise differential input which the mfr does not mention. All gear with RCA inputs should be made this way. This design breaks any ground loop on the input, making it easier to interconnect this with other devices without having ground currents flow and picking up noise in the process. This makes the unit perform well even with the plastic case. I found no extra noise resulting from the unshielded case. I'm not sure I would use this device for recording just in principle, but the noise figures look great actually. Setting the maximum input level reaching the Timpano is important because the Timpano inputs clip at around 5.6vpp or +8dB. Some gear powered by 120V can generate an output significantly greater. I have a mixer/preamp which generates more than +18dB which would be a huge overload. In order for things to interoperate properly, I built a -11dB resistive divider to permit the full output from my preamp to be fed to the Timpano. To offset this the 15dB of internal gain on the Timpano was needed. The noise performance was impacted slightly but was still completely acceptable. Some customers mentioned the flimsy RCA jacks. At this price I'm not concerned but be smart. I would not under any circumstance plug a "monster" cable into this. Monster cables are for looks only, waste money, and damage fragile jacks. Use only soft, thin RCA cables whose connectors are neither loose or tight. You don't need to spend a lot of money on RCA cables. The power terminals are well-made if you treat them properly with wire that is not stiff and you do not overtorque the terminals. They are recessed and have square washers for a secure fit. They depend on the circuit board for support so don't abuse them. My only "complaint" is the release time of the limiter is shorter than advertised. The "attack" time works properly at up to 100mS. The release time is actually about 1/4 of the advertised 1600mS or 400mS. The limiter lamps don't turn off until about 1200mS but by then the audible effects of the release have long decayed. 400mS is a short release time and will give a pumping effect if the limiter is hard-driven on music with a pulsing bassline. For "normal" use the decay is OK but there isn't extra room to adjust it. It should be advertised as a smaller number. The limiter threshold tends to work a little differently on devices from different manufacturers. This is not a peak limiter or RMS limiter, but approximately a half-wave averaging limiter and the threshold needs to be adjusted based on that. A threshold of around -18dB (1/2-wave rectified, averaged, with respect to the peak output) is good. This allows a sin wave to generate a peak VU output of around -6dB. With this setting, music or white noise will peak at about +3dB VU. The Timpano output clips at about +8dB VU so there is still 5dB headroom within the limiter and the musical output can remain unclipped or nearly so, depending on the musical attack. I would not recommend increasing the threshold above -13dB or music may be clipped if you drive the system hard. The above paragraph gives hints on how your amp should be adjusted. I would suggest a VU meter that handles the full amp output. Wear hearing protection and play a sin wave and increase the amp gain until clipping, then back off by 6dB. Final adjustment would be with your ears, being careful if you need protection. With the limiter driven hard, increase the amp gain until you can just hear the distortion, then back it off until you can't. With this setting the amp will still be clipping slightly on the attacks which are already exaggerated by the 100mS response of the "auto" setting on the limiter. The effect of the exaggerated attacks will be offset by them being clipped and the result is the effects largely cancel. This is the loudest your amp could play and sound fairly clean using the limiter's "auto" setting. It should be slightly "fatter" and clearer than what you get without the limiter and should have no distortion "crunch" unless that's what you tuned for. You should also be able to increase your input volume all the way and it will not get louder or sound much different. I haven't even mentioned the EQ. An inexpensive but amazing RTA tool was used for tuning the EQ. I used a Dayton Audio iMM-6 (older generation) calibrated mic with Bofinit "Audiotool" app installed on an old unused Android phone. I also used a white noise test file. Full volume is not required so save your ears and play the white noise at medium volume without the limiter kicking in. After calibrating the mic by downloading and installing the Dayton Audio calibration file, play the white noise and record the speaker's profile with the audiotool RTA app at full resolution. My speakers were EV SX100+ and the profile I recorded using the RTA matched the engineering data sheet from the mfr almost exactly. I made two tweaks, using the parametric EQ to tame down a ringing of the tweeters at 18K, and using the graphic EQ to push down the response at around 6K. The speakers sound smoother and I'm very satisfied with the DSP doing its job. The additional tools I used for tuning were absolutely necessary but not expensive. I used an old PC with embedded line in and out jacks. The software was Cool edit 96, Audacity, and VLC media player. I also needed a peak VU meter which was the most expensive tool. A cheap AC voltmeter can work instead of the VU but skills are needed to understand the reading. If it's an averaging or true RMS meter the reading will continue to increase even during clipping and the results can be misleading. Resistors were needed to give the VU meter enough range to handle the maximum voltage from the power amp, making the peak output fall into the middle of the VU meter range. Resistors were also needed to level shift between my preamp and the Timpano. To sum up, a limiter should be used to complete just about any audio system big or small. To me the graphic EQ of this product is just a free bonus. Together these features make the Timpano a great product. If adjusted properly you will be able to hear the difference and your system will be more forgiving and enjoyable.
Review: Great DSP at a budget price - Purchased this because I wanted to retain my stock head unit but I was having some gain balance issues and couldn't get the sound stage centered like I was used to with aftermarket head units using time alignment. This is going to a 4ch amp powering my door and dash speakers on the front channel (factory wired as 4ohms) and a bridged 10in subwoofer After working with the time alignment I am a lot more satisfied with the imaging. Because of the way the speakers are wired I'm still dialing in the time alignment but I've got the band singing to me from the hood. I also had some balance issues with the head unit making my left side quite a bit louder than the right. Using the individual channel gain controls I've got that issue under control. The included crossover points are infinitely adjustable so my front speakers are better matched to what they can actually play. The preset EQs are a great start and with some more fine tuning I should have this dialed in. If you're amping a factory head unit I STRONGLY suggest buying this so you can overcome the factory tuned EQ curve and bass rolloff Very easy to connect inbetween my amp and head unit, just run a bridge wire over to your amp +/- and remote. If you're using speaker level inputs and your converter voltage is turned up you MAY have issues with the unit not powering off as I do. At this point it's a small draw and I probably need to tap a different line on my converter's remote wire but that isn't a fault of the unit, but it is something to watch out for as idk how many amps it's pulling. At the moment it may just be the blue led, time will tell.

## Features

- The compact TPT-SP4BT is signal processor ( DSP ) controlled by bluetooth connection direct from your phone or tablet. This powerful tool allows users to optimize the performance of their custom sound system, regardless of whether they are using a aftermarket unit or factory radio.
- The processor’s information can be viewed and configured remotely using smartphones with Android or iOS systems. In your device’s app store (Play store) Or (Apple Store), search for our TIMPANO TPT-SP4BT app.
- Its exclusive sequencer feature (SEQUENCER) makes it possible to configure the programmed startup and shutdown of up to three products from the remote startup connections (S1, S2, and S3).
- ts digital signal processor allows real-time modification of equalization, crossover filters, alignment, gain control, phase inversion, limiter, input/output routing, and features such as: Battery Voltmeter, Frequency Generator, Frequency Sweep and Pink Noise.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B0BT68NQ87 |
| Best Sellers Rank | #18,494 in Electronics ( See Top 100 in Electronics ) #20 in Car Amplifier Equalizers |
| Brand Name | Timpano |
| Customer Reviews | 4.6 out of 5 stars 158 Reviews |
| Included Components | Timpano TPT-SP4BT Bluetooth Car Audio Signal Processor |
| Item Dimensions | 3.15 x 2.36 x 0.5 inches |
| Item Weight | 0.4 Pounds |
| Item dimensions L x W x H | 3.15 x 2.36 x 0.5 inches |
| Manufacturer | Timpano |
| Maximum Supply Voltage | 15 Volts (DC) |
| Minimum Supply Voltage | 10 Volts (DC) |
| Model | TPT-SP4BT |
| Mounting Type | Surface Mount |
| Number of Channels | 4 |
| Package Type Name | Retail Box |
| Part Number | TPT-SP4BT |
| Specification Met | FCC |
| UPC | 810075522129 |
| Unit Count | 1.0 Count |
| Voltage | 15 Volts (DC) |

## Product Details

- **Item dimensions L x W x H:** 3.15 x 2.36 x 0.5 inches
- **Manufacturer:** Timpano
- **Maximum Supply Voltage:** 15 Volts (DC)
- **Minimum Supply Voltage:** 10 Volts (DC)
- **Voltage:** 15 Volts (DC)

## Images

![TPT-SP4BT Bluetooth DSP 4 Output Channel- Full Digital Signal DSP Car Audio Processor - Built-in Voltmeter and Remote Relay - Image 1](https://m.media-amazon.com/images/I/61se0lD6NQL.jpg)
![TPT-SP4BT Bluetooth DSP 4 Output Channel- Full Digital Signal DSP Car Audio Processor - Built-in Voltmeter and Remote Relay - Image 2](https://m.media-amazon.com/images/I/71qxGynXKML.jpg)
![TPT-SP4BT Bluetooth DSP 4 Output Channel- Full Digital Signal DSP Car Audio Processor - Built-in Voltmeter and Remote Relay - Image 3](https://m.media-amazon.com/images/I/61J++OH77FL.jpg)
![TPT-SP4BT Bluetooth DSP 4 Output Channel- Full Digital Signal DSP Car Audio Processor - Built-in Voltmeter and Remote Relay - Image 4](https://m.media-amazon.com/images/I/61VooI4bXXL.jpg)
![TPT-SP4BT Bluetooth DSP 4 Output Channel- Full Digital Signal DSP Car Audio Processor - Built-in Voltmeter and Remote Relay - Image 5](https://m.media-amazon.com/images/I/61HqTCfpj3L.jpg)

## Questions & Answers

**Q: Are the settings saved while disconnected from the battery for an extended time, like months?**
A: The settings are retained forever, even if power is disconnected.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Great Device at this Price
*by C***D on September 17, 2023*

I bought the Timpano DSP mostly as a limiter because I was not satisfied with a competing product. The Timpano has a lower input noise and wider dynamic range. It should do a great job for most applications if you understand how it works. Adjusting it is not really for beginners, so for those new to this please keep an open mind that you may discover things you didn't know and may need to seek out an expert or do some research. You need some supporting tools to do this and even with tools, expect to take some time to optimize things. You don't want to "wing" it or tune by ear or you won't get everything that your system is capable of and you could waste a lot of time. Before going through the tuning process here are some important features of the Timpano: Low cost Light plastic case with simple 2-fastener mounting. Low profile and small size Free Bluetooth app which worked perfectly with my Samsung Android phone The RCA inputs are semi-floating, low noise, differential inputs (nice!) The "high" or Spr input is also differential and attenuated by 20dB and has a 1K impedance. Up to 15dB gain Limiter threshold is based on signal's 1/2-wave rectified average value, referenced to the full output. Full output (0dB) is about 5.6vpp or +8dB VU. There was a gradual drop in output above 12KHz but this can be managed with the EQ. Power supply rejection is as good as most other equipment but be sure to feed it clean power. The "auto" settting of the limter is 100mS attack and "1600mS" release - but please see below. The EQ is applied at the input and affects all outputs There are separate adjustable parametric filters for the individual ouputs, before the limiter. The unit's best feature is the low noise differential input which the mfr does not mention. All gear with RCA inputs should be made this way. This design breaks any ground loop on the input, making it easier to interconnect this with other devices without having ground currents flow and picking up noise in the process. This makes the unit perform well even with the plastic case. I found no extra noise resulting from the unshielded case. I'm not sure I would use this device for recording just in principle, but the noise figures look great actually. Setting the maximum input level reaching the Timpano is important because the Timpano inputs clip at around 5.6vpp or +8dB. Some gear powered by 120V can generate an output significantly greater. I have a mixer/preamp which generates more than +18dB which would be a huge overload. In order for things to interoperate properly, I built a -11dB resistive divider to permit the full output from my preamp to be fed to the Timpano. To offset this the 15dB of internal gain on the Timpano was needed. The noise performance was impacted slightly but was still completely acceptable. Some customers mentioned the flimsy RCA jacks. At this price I'm not concerned but be smart. I would not under any circumstance plug a "monster" cable into this. Monster cables are for looks only, waste money, and damage fragile jacks. Use only soft, thin RCA cables whose connectors are neither loose or tight. You don't need to spend a lot of money on RCA cables. The power terminals are well-made if you treat them properly with wire that is not stiff and you do not overtorque the terminals. They are recessed and have square washers for a secure fit. They depend on the circuit board for support so don't abuse them. My only "complaint" is the release time of the limiter is shorter than advertised. The "attack" time works properly at up to 100mS. The release time is actually about 1/4 of the advertised 1600mS or 400mS. The limiter lamps don't turn off until about 1200mS but by then the audible effects of the release have long decayed. 400mS is a short release time and will give a pumping effect if the limiter is hard-driven on music with a pulsing bassline. For "normal" use the decay is OK but there isn't extra room to adjust it. It should be advertised as a smaller number. The limiter threshold tends to work a little differently on devices from different manufacturers. This is not a peak limiter or RMS limiter, but approximately a half-wave averaging limiter and the threshold needs to be adjusted based on that. A threshold of around -18dB (1/2-wave rectified, averaged, with respect to the peak output) is good. This allows a sin wave to generate a peak VU output of around -6dB. With this setting, music or white noise will peak at about +3dB VU. The Timpano output clips at about +8dB VU so there is still 5dB headroom within the limiter and the musical output can remain unclipped or nearly so, depending on the musical attack. I would not recommend increasing the threshold above -13dB or music may be clipped if you drive the system hard. The above paragraph gives hints on how your amp should be adjusted. I would suggest a VU meter that handles the full amp output. Wear hearing protection and play a sin wave and increase the amp gain until clipping, then back off by 6dB. Final adjustment would be with your ears, being careful if you need protection. With the limiter driven hard, increase the amp gain until you can just hear the distortion, then back it off until you can't. With this setting the amp will still be clipping slightly on the attacks which are already exaggerated by the 100mS response of the "auto" setting on the limiter. The effect of the exaggerated attacks will be offset by them being clipped and the result is the effects largely cancel. This is the loudest your amp could play and sound fairly clean using the limiter's "auto" setting. It should be slightly "fatter" and clearer than what you get without the limiter and should have no distortion "crunch" unless that's what you tuned for. You should also be able to increase your input volume all the way and it will not get louder or sound much different. I haven't even mentioned the EQ. An inexpensive but amazing RTA tool was used for tuning the EQ. I used a Dayton Audio iMM-6 (older generation) calibrated mic with Bofinit "Audiotool" app installed on an old unused Android phone. I also used a white noise test file. Full volume is not required so save your ears and play the white noise at medium volume without the limiter kicking in. After calibrating the mic by downloading and installing the Dayton Audio calibration file, play the white noise and record the speaker's profile with the audiotool RTA app at full resolution. My speakers were EV SX100+ and the profile I recorded using the RTA matched the engineering data sheet from the mfr almost exactly. I made two tweaks, using the parametric EQ to tame down a ringing of the tweeters at 18K, and using the graphic EQ to push down the response at around 6K. The speakers sound smoother and I'm very satisfied with the DSP doing its job. The additional tools I used for tuning were absolutely necessary but not expensive. I used an old PC with embedded line in and out jacks. The software was Cool edit 96, Audacity, and VLC media player. I also needed a peak VU meter which was the most expensive tool. A cheap AC voltmeter can work instead of the VU but skills are needed to understand the reading. If it's an averaging or true RMS meter the reading will continue to increase even during clipping and the results can be misleading. Resistors were needed to give the VU meter enough range to handle the maximum voltage from the power amp, making the peak output fall into the middle of the VU meter range. Resistors were also needed to level shift between my preamp and the Timpano. To sum up, a limiter should be used to complete just about any audio system big or small. To me the graphic EQ of this product is just a free bonus. Together these features make the Timpano a great product. If adjusted properly you will be able to hear the difference and your system will be more forgiving and enjoyable.

### ⭐⭐⭐⭐⭐ Great DSP at a budget price
*by J***A on August 8, 2025*

Purchased this because I wanted to retain my stock head unit but I was having some gain balance issues and couldn't get the sound stage centered like I was used to with aftermarket head units using time alignment. This is going to a 4ch amp powering my door and dash speakers on the front channel (factory wired as 4ohms) and a bridged 10in subwoofer After working with the time alignment I am a lot more satisfied with the imaging. Because of the way the speakers are wired I'm still dialing in the time alignment but I've got the band singing to me from the hood. I also had some balance issues with the head unit making my left side quite a bit louder than the right. Using the individual channel gain controls I've got that issue under control. The included crossover points are infinitely adjustable so my front speakers are better matched to what they can actually play. The preset EQs are a great start and with some more fine tuning I should have this dialed in. If you're amping a factory head unit I STRONGLY suggest buying this so you can overcome the factory tuned EQ curve and bass rolloff Very easy to connect inbetween my amp and head unit, just run a bridge wire over to your amp +/- and remote. If you're using speaker level inputs and your converter voltage is turned up you MAY have issues with the unit not powering off as I do. At this point it's a small draw and I probably need to tap a different line on my converter's remote wire but that isn't a fault of the unit, but it is something to watch out for as idk how many amps it's pulling. At the moment it may just be the blue led, time will tell.

### ⭐⭐⭐⭐⭐ Wish it was better quality and ability to always tie 2 channels together, I would pay more
*by D***. on August 26, 2023*

At first when installing I am like WHY WONT THIS POS connect....... Then I realized the instructions aren't 100% correct. The unit was booting up so fast that it was already showing up in the app. I thought the line where the device is shown was just saying what it was expecting to find and then I would see the Bluetooth ID under that. Nope that IS the device, so just click right on that spot. You can 1 time copy settings between channels which is good for initial setup but if you have and want stereo sound going to your amp then you will need to manually copy the settings each time or use the copy button each time which is in a completely different section. It sucks when tweaking settings and say you're trying to find where you want that extra punch in the EQ and how much Q to apply, you can either unplug one RCA or change all the settings, go into the other channel and do again and back and forth. The High input is a total bummer and looks like sht in a nice install but the cheap box kind of does in general. The RCA inputs are ultra sketch when using higher end RCA's that really grip the jacks, I feel like I am going to tear then out of the board when plugging and unplugging them, thankfully that's not often. I would have paid $50 more for a better housing and Allen screw high inputs. Something like any $50-$100 crossover on the market, I know this does more than that, but I am saying if a $50 crossover can have a nice housing and better inputs then it must not cost that much, and I would have gladly paid $50 more. Overall, for the money and if you don't already have a DSP on your subs or anything you have an AMP for, well simply put... that's dumb. Its LOUDER and CLEANER period, don't care how good your head unit or amps are, without a DSP you are missing out big time,

## Frequently Bought Together

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- RECOIL RCI23 100% Oxygen Free Copper 3ft 2-Channel RCA Audio Cable, Twisted Pair with Noise Reduction
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*Product available on Desertcart Italy*
*Store origin: IT*
*Last updated: 2026-05-09*