---
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: "C$10957"
currency: NIO
in_stock: true
reviews_count: 8
category: "Timpano"
url: https://www.desertcart.ni/products/510165143-tpt-sp4bt-bluetooth-dsp-4-output-channel-full-digital-signal
store_origin: NI
region: Nicaragua
---

# 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:** C$10957
**Availability:** ✅ In Stock

## Summary

> 🎵 Elevate your ride’s sound with pro-grade DSP control — because your car deserves to sound as sharp as you do.

## 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?** C$10957 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.ni](https://www.desertcart.ni/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

- • **Smart Sequencer Startup:** Automate startup/shutdown of up to 3 connected devices remotely for hassle-free system management.
- • **Integrated Battery Voltmeter:** Monitor your car’s battery health in real-time to avoid unexpected power drops during your drive.
- • **Low-Noise Differential Inputs:** Experience crystal-clear sound with minimized ground loop noise, even with factory or aftermarket head units.
- • **Seamless Bluetooth DSP Control:** Tune your car audio wirelessly from any iOS or Android device with the dedicated Timpano app.
- • **Precision 4-Channel Audio Processing:** Customize 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. Compatible with both factory and aftermarket systems, it offers real-time EQ, crossover, gain, phase, and limiter adjustments via a smartphone app. Additional features include a built-in battery voltmeter, remote relay control, and a unique sequencer for managing multiple devices. Its low-noise differential inputs ensure clean audio performance, making it a top choice for millennial professionals seeking to upgrade their in-car audio experience with smart, wireless convenience.

## Description

Buy Timpano TPT-SP4BT Bluetooth DSP 4 Output Channel- Full Digital Signal DSP Car Audio Processor - Built-in Voltmeter and Remote Relay: Equalizers - desertcart.com ✓ FREE DELIVERY possible on eligible purchases

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 | #12,584 in Electronics ( See Top 100 in Electronics ) #11 in Car Amplifier Equalizers |
| Brand | Timpano |
| Color | Black |
| Customer Reviews | 4.6 4.6 out of 5 stars (144) |
| Date First Available | January 26, 2023 |
| Item Weight | 6.4 ounces |
| Item dimensions L x W x H | 3.15 x 2.36 x 0.5 inches |
| Item model number | TPT-SP4BT |
| Manufacturer | Timpano |
| Maximum Supply Voltage | 15 Volts (DC) |
| Minimum Supply Voltage | 10 Volts (DC) |
| Mounting Type | Surface Mount |
| Number of Channels | 4 |
| Other display features | Wireless |
| Package Type Name | Retail Box |
| Product Dimensions | 3.15 x 2.36 x 0.5 inches |
| Specification Met | FCC |
| UPC | 810075522129 |
| Voltage | 15 Volts (DC) |
| Whats in the box | Timpano TPT-SP4BT Bluetooth Car Audio Signal Processor |

## 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)

## 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.

### ⭐⭐⭐⭐⭐ Low cost DSP for your vehicle.
*by S***N on December 29, 2025*

Functions very well and very easy to program. Very nice to operate also and reliable.

## Frequently Bought Together

- Timpano TPT-SP4BT Bluetooth DSP 4 Output Channel- Full Digital Signal DSP Car Audio Processor - Built-in Voltmeter and Remote Relay
- RECOIL RCI23 100% Oxygen Free Copper 3ft 2-Channel RCA Audio Cable, Twisted Pair with Noise Reduction
- Timpano TPT-1000.4 Compact 4 Channel Car Audio Amplifier – 4 x 260 Watts at 2 Ohms – High Power Stereo 12 Volts Full Range Class D Amp Bridgeable

---

## Why Shop on Desertcart?

- 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016
- 🌍 **Shop Globally** — Access 737+ million products across 21 categories
- 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price
- 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members)
- 🔒 **Secure Payments** — Trusted payment options with buyer protection
- ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews

**Shop now:** [https://www.desertcart.ni/products/510165143-tpt-sp4bt-bluetooth-dsp-4-output-channel-full-digital-signal](https://www.desertcart.ni/products/510165143-tpt-sp4bt-bluetooth-dsp-4-output-channel-full-digital-signal)

---

*Product available on Desertcart Nicaragua*
*Store origin: NI*
*Last updated: 2026-02-23*