Deaf Bonce M8-DSP Review: 8-Channel Processor for Factory Head Unit Systems
Updated: Oct 6
The Deaf Bonce M8-DSP is an eight-channel digital signal processor from the Machete range, built to sit between a head unit, factory or aftermarket, and your amplifiers. It takes four high-level (speaker-level) input channels or two pairs of RCA inputs, processes at 24-bit/48 kHz with a quoted signal-to-noise ratio above 115 dB, and feeds eight RCA output channels at line level, so it needs separate amplifiers. In India it carries an MRP of ₹39,990, well above Deaf Bonce's simple M6C converter. It suits owners who want to keep a factory touchscreen but build a properly tuned multi-amplifier system. Details and pricing are on our Deaf Bonce M8-DSP product page.
Key points
Four high-level input channels for a factory head unit, plus two pairs of RCA inputs, feeding eight RCA outputs.
Set up from a PC over USB or with Android software; Deaf Bonce's product page offers version 1.3 of both.
Ports for an external Bluetooth module and a remote control, though neither appears in the box contents list.
No owner reviews or independent tests turned up, and the manual doesn't document EQ bands or time-delay range.
Deaf Bonce M8-DSP specifications
Specification | Deaf Bonce M8-DSP |
|---|---|
Type | 8-channel DSP processor, line-level outputs |
High-level inputs | 4 channels, via harness |
RCA inputs | 2 pairs, 0.2–6 V signal |
RCA outputs | 4 pairs (8 channels) |
Input impedance | More than 20 kOhm (high-level and RCA) |
Sampling | 24-bit / 48 kHz |
Frequency response | 20 Hz – 20 kHz |
Signal-to-noise ratio | More than 115 dB |
Auto power-on modes | REM, speaker signal or RCA signal |
Connections | USB (PC), Bluetooth module port, remote port, REM in and out |
Software | Windows and Android, version 1.3 |
Operating voltage | 9–17 V |
Installation temperature | 0 °C to 55 °C |
Packed weight | 0.92 kg |
India MRP | ₹39,990 |
Figures come from Deaf Bonce's M8-DSP product page, which hosts the software downloads, and the M8-DSP owner's manual. Neither lists dimensions.
Inputs, outputs and the default channel plan
The high-level inputs arrive on a single harness with positive and negative wires for channels 1 to 4, plus +12 V, ground, REM IN and REM OUT. That suits a typical factory system's front and rear speaker feeds. The two RCA pairs accept 0.2–6 V, so an aftermarket head unit or another line-level source can feed the processor instead.
The manual's default settings show what Deaf Bonce has in mind. Channels 1 and 2 drive front tweeters with a 3500 Hz high-pass; channels 3 and 4 drive the front woofers from 80 Hz to 3500 Hz; channels 5 and 6 cover the rear speakers above 80 Hz; channel 7 is a centre channel from 120 Hz to 5500 Hz; and channel 8 is a subwoofer from 30 Hz to 80 Hz. All the defaults use 12 dB slopes. In other words, it's laid out for an active two-way front stage, rear fill, a centre and a sub.
Software, Bluetooth and the gaps in the paperwork
Tuning happens in Deaf Bonce's software, offered for Windows and Android on the product page, with a USB cable included. What the manual doesn't do is describe the software. It lists no count of EQ bands, no time-delay range and no choice of filter slopes beyond the 12 dB defaults, so we can't tell you exactly how fine the adjustments go. If a particular feature matters to you, ask us to check it in the software before you buy.
The unit has a port for an external Bluetooth module and a connector for a remote control, but the box contents list only the processor, manual, warranty card, USB cable, harness connector, mounting feet and screws. Budget for either accessory separately if you want it, and confirm availability with us. If you're new to processors, our guide to setting up a DSP in your car explains the basic steps.
What owners and reviewers say about the Deaf Bonce M8-DSP
When we checked in October 2026, we couldn't find owner reviews, forum threads or independent tests of the M8-DSP. Deaf Bonce's product page offers only downloads and basic details, Alphard's Russian store page lists only basic details and no reviews, and the big retailer and forum sites we tried had nothing on it or blocked our access.
That means no independent word yet on the software's ease of use or the processor's noise floor in a real car. If you've tuned a system with one, we'd welcome your experience, especially with a factory head unit.
How it compares with the Zapco HB 68 II and the M6C
A comparable processor-only rival we sell is the Zapco HB 68 II (₹24,990 MRP). Zapco lists eight channels with 31-band EQ per output, six high-level input channels, a two-channel RCA input, built-in Bluetooth 5.1 streaming, a USB music player, and PC, Android and iOS control, with a quoted signal-to-noise ratio above 100 dB. On paper it offers more documented features for ₹15,000 less. The M8-DSP's advantages are its higher quoted signal-to-noise ratio and its second pair of RCA inputs.
If you don't need processing at all, the Deaf Bonce M6C (₹6,990) simply converts a factory head unit's speaker-level signal for six channels. Either way, you still need amplifiers: the five-channel MFA-5.1000, rated at 4 × 80 W plus 300 W at 4 ohm, could run the front, rear and subwoofer, or you could split duties between the four-channel MFA-4.80 and a monoblock such as the MFA-1.800.
Who should buy it, and who shouldn't
Consider it if you're keeping a factory head unit, plan an active front stage with separate amplifier channels, and like the idea of a matched Deaf Bonce processor and amplifier set. The REM, speaker and RCA turn-on modes make factory integration simpler.
Look elsewhere if you want Bluetooth, an iOS app or a documented EQ in the box at this price, where the Zapco HB 68 II lists more for less, or if you only need to add a subwoofer, where the M6C costs a fraction as much.
Installation notes for Indian cars
Deaf Bonce says to install the processor where the temperature stays between 0 °C and 55 °C, so keep it off the parcel shelf and away from the hottest parts of the boot; under a front seat or behind the glovebox are common choices, if there's room. Use the speaker-signal turn-on mode if you'd rather not hunt for a switched wire, and run REM OUT to the amplifiers. Keep the harness connections secure, since dust and vibration on rough roads loosen poor joints.
Plan the tuning time too. A DSP only sounds as good as its set-up, and a factory system's signal may need its own corrections. VA3 Car Studio in Ghaziabad offers professional installation and can tune the DSP; read why a DSP helps in car audio if you're still deciding.
Price and where to buy
The Deaf Bonce M8-DSP has an MRP of ₹39,990. We often sell below MRP, so check the current price on our M8-DSP product page. We sell genuine Deaf Bonce stock and can quote the processor and amplifiers together.
The bottom line
The M8-DSP gives a factory head unit a route into an eight-channel, actively filtered system, with flexible turn-on options and a strong quoted noise figure. Its paperwork is thin, though: no published EQ or delay details, no dimensions, and the Bluetooth module and remote aren't in the box. With no independent reviews yet, it's worth checking the software first, and comparing it with the better-documented Zapco HB 68 II.
Deaf Bonce M8-DSP FAQ
Can the Deaf Bonce M8-DSP connect to a factory head unit?
Yes. It has four high-level input channels on its harness, so it can take a factory head unit's speaker outputs directly, and it can switch itself on from the speaker signal. It also has two pairs of RCA inputs for line-level sources.
Does the M8-DSP have Bluetooth?
It has a port for an external Bluetooth module, but the manual's box contents list doesn't include one. Plan to buy the module separately if you want Bluetooth, and check availability with us first.
Does the M8-DSP include amplifiers?
No. Its outputs are eight RCA line-level channels, so it needs separate amplifiers, such as a four-channel amplifier for the speakers and a monoblock for the subwoofer.
Buy Deaf Bonce DSP Processors in India
You can buy the Deaf Bonce Machete M8-DSP 8-Channel DSP Processor with High-Level online from VA3 Car Studio with pan-India shipping. See more Deaf Bonce DSP processors, compare other car DSP processors, or book DSP installation and tuning in Ghaziabad.
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