Resolut A-IN Review: Connecting a Resolut Processor to Analogue and Factory Sources
Updated: Oct 6
The Resolut A-IN is the plug-in analogue input module for Resolut's standalone processors. It adds up to eight input channels, each of which accepts either line level (RCA, up to 4 V RMS) or speaker level (up to 45 V RMS), and converts them with a quoted 112 dB dynamic range. Its India MRP is ₹44,990, and Resolut lists it for the A-DSP, T-DSP mk2, H-DSP and M-DSP. It's the module Resolut offers for connecting those processors to a factory head unit, an aftermarket head unit's RCA outputs or a factory amplifier. See today's price on our A-IN product page.
Quick summary
Eight analogue input channels, each usable at line level or speaker level.
Made for the A-DSP, T-DSPmk2, H-DSP and M-DSP; the X8-DSP and X12-DSP have analogue inputs built in.
Supplied with connectors for line-level and speaker-level wiring; its input settings appear in Resolut DSP Tool once it's installed.
Resolut's page gives 4 V RMS as the line-input maximum; some dealer listings, ours included at the time of writing, show 3 V.
Resolut A-IN specifications
Specification | Resolut A-IN |
|---|---|
Type | Plug-in analogue input module |
Inputs | 8, each line-level (RCA) or high-level (speaker) |
Maximum line-level input | 4 V RMS |
Maximum high-level input | 45 V RMS |
Conversion dynamic range | 112 dB |
Dimensions | 64 x 44 x 24 mm |
In the box | Module, plus connectors for line-level and high-level inputs |
Compatible processors | A-DSP, T-DSP mk2, H-DSP, M-DSP |
India MRP | ₹44,990 |
Figures come from Resolut's A-IN page. Resolut also publishes a separate installation guide for the module, which we haven't read.
Why a Resolut processor may need the A-IN
Resolut's standalone processors come with coaxial and optical digital inputs, and everything else is modular. Its older A-DSP and T-DSP manual shows the analogue input settings only when the analogue input module is installed, and its current DSP Tool manual says the presence of analogue inputs depends on the plug-in, not just the model name. Our listings for these four processors show eight analogue inputs as standard, but Resolut treats the analogue input as an optional plug-in, so if your source is analogue, plan on the A-IN and ask us to confirm what your processor ships with.
If you're keeping a factory touchscreen for CarPlay, Android Auto and cameras and it sends speaker-level analogue signals to the speakers, the A-IN is how a Resolut processor receives them.
Line level or speaker level
Each of the eight channels can be wired either way. Line-level inputs take RCA signals from an aftermarket head unit's pre-outs, up to 4 V RMS. High-level inputs take speaker wires directly from a head unit or factory amplifier, up to 45 V RMS. Resolut says the A-IN works independently of the processor's other sources, so a digital source can stay connected alongside it.
Rebuilding a factory signal
Factory systems often split music across separate tweeter and woofer feeds, each with its own filtering. The processor can mix several inputs into one output, which is how the original full-range signal is put back together before you build your own crossovers.
Know what the module may not do yet. Resolut's T-DSP mk2 page carries no date and lists the plug-in analogue module as available without frequency-response correction, delays or band grouping, with a software update adding those functions listed as in development; we couldn't confirm whether it has shipped, so ask us before you plan around it. The page also describes a summing mode for factory systems that compensates for their delays and phase shifts. A careful tune with a measurement microphone remains essential.
Fitting and setting up
The A-IN is an internal plug-in module rather than a separate box, and it comes with its own connectors for line-level and speaker-level wiring. Resolut's release notes for DSP Tool 1.3.11 describe a plug-in installation menu where you choose the installed module from a list, with the processor updating itself automatically, and a separate tab for the analogue inputs; we didn't find that menu in the current 3.2.1 manual, so ask us how your software version handles it. Our guide to setting up a DSP in your car explains the tuning that follows.
What owners and reviewers say about the Resolut A-IN
We found no owner reviews of the A-IN when we checked in October 2026. The Moscow dealer Magnitolkin's A-IN page says there are no reviews yet, the SoundDrive Resolut listing shows no ratings, and Drive2, where Russian installers post build logs, blocked our access. What we can say comes from Resolut's specifications. If you've used an A-IN, tell us how it worked with your factory system.
A-IN vs the alternatives
If you'd rather not add a module, Resolut's processor amplifiers have analogue inputs built in: the X8-DSP has eight and the X12-DSP twelve, and Resolut's manual describes HI LEVEL inputs for speaker-level sources on both.
It's also worth seeing the price in context. The A-IN alone costs more than half as much as Zapco's DSP-Z8 IV AT (₹72,990), a complete eight-channel processor with eight speaker-level inputs built in, and more than Deaf Bonce's M8-DSP (₹39,990), which has four pairs of high-level inputs. For a factory-system upgrade on a smaller budget, those are cheaper routes with speaker-level inputs built in. Our article on whether your car needs an amplifier helps with the wider plan.
Who should buy it, and who shouldn't
Buy the A-IN if you own or are buying an A-DSP, T-DSPmk2, H-DSP or M-DSP and your music arrives as an analogue signal, from a factory head unit, an aftermarket head unit's RCA outputs or a factory amplifier.
Skip it if you have an X8-DSP or X12-DSP, or if every source reaches the processor digitally: coaxial or optical from a head unit, or Resolut's USB-IN HQ, BT-IN or M25-IN modules.
Installation notes for Indian cars
For a factory touchscreen, take the speaker-level signal with a plug-in harness adapter where one is available rather than cutting the factory wiring; it keeps the job reversible. Identify each factory output with a test tone before you connect it, especially in cars with separate tweeter feeds or a factory amplifier. Keep high-level input wiring away from power cables to avoid noise, and make sure the processor housing the module stays ventilated in a hot boot. VA3 Car Studio in Ghaziabad can fit the A-IN with the processor as part of a professional installation.
Price and where to buy
The Resolut A-IN has an MRP of ₹44,990. Check today's price on our A-IN listing, and tell us which processor and source you have so we can confirm what you need.
The bottom line
The A-IN is a simple but essential part for anyone feeding analogue signals into a Resolut standalone processor: eight channels, each at line or speaker level, with Resolut's quoted limits of 4 V RMS at line level and 45 V RMS at speaker level. It adds ₹44,990 to an already expensive system, and Resolut's undated T-DSP mk2 page lists frequency-response and delay correction for the module as in development, but for a Resolut build behind a factory head unit it's the part that makes the connection.
Resolut A-IN FAQ
Which processors does the Resolut A-IN work with?
Resolut lists the A-DSP, T-DSP mk2, H-DSP and M-DSP. The X8-DSP and X12-DSP processor amplifiers have their own analogue inputs and don't need it.
Can the A-IN take a factory head unit's speaker outputs?
Yes. Each of its eight channels can be used as a high-level input for speaker wires, rated up to 45 V RMS, or as a line-level RCA input up to 4 V RMS on Resolut's figures (our listing shows 3 V).
Do I need the A-IN if my source is digital?
No. If your source connects by coaxial or optical cable, or through Resolut's USB-IN HQ, BT-IN or M25-IN modules, the A-IN isn't needed. It's only for analogue sources.
Buy the Resolut A-IN 8-Channel Analogue Input Module in India
Check the Resolut A-IN 8-Channel Analogue Input Module price in India, browse more Resolut DSP processors or compare all car DSP processors in India. Want it fitted properly? Book DSP installation and tuning at our Ghaziabad studio.
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