Zapco DAC Kit B Review: The AK4490 Output Upgrade for HDSP Processors
Updated: Oct 7
The Zapco DAC Kit B is the first of two optional output-converter upgrades Zapco offers for its HDSP-Z16 V processors, and it uses the AK4490 chip. The 2026 Indian catalogue rates it at 32-bit, 784 kHz and 120 dB dynamic range in eight-channel form, against 115 dB for the AK4458 fitted as standard, and each kit handles eight channels. It suits HDSP owners whose system is otherwise sorted and who want to improve the one converter every source passes through. The catalogue prints no MRP and the kit isn't in our online store yet, but the processors it upgrades, the HDSP-Z16 V AD-16A and HDSP-Z16 V AD-8A, are listed with prices.
At a glance
Replaces the standard AK4458 output converter with an AK4490: 120 dB dynamic range in the catalogue, against 115 dB.
Zapco's own kit page quotes different figures, up to 768 kHz and 129 dB, so its sources don't agree.
The DAC sits after all the processing, so the upgrade applies to every source: analogue inputs, digital inputs and the USB player.
No MRP, no store listing and no independent reviews yet; the only performance claims are Zapco's.
Zapco DAC Kit B specifications
Specification | DAC Kit B (DAC KIT B14 V) |
|---|---|
Type | Optional DAC (digital-to-analogue converter) module |
Converter chip | AK4490 |
Resolution | 32-bit |
Rated sampling capability | 784 kHz (catalogue); up to 768 kHz (kit page) |
Dynamic range | 120 dB in 8-channel form (catalogue); up to 129 dB (kit page) |
THD+N | −112 dB (kit page) |
Channels per kit | 8 |
Standard DAC on AD-16A and AD-8A | AK4458: 32-bit, 115 dB, THD+N −107 dB |
Compatibility (Zapco's wording) | DSP-Z16V and the other fifth-generation Zapco digital processors |
India MRP | Not printed in the 2026 catalogue |
The catalogue figures match the option listing on Zapco's AD-16A and AD-8A product pages, while Zapco's dedicated DAC Kit B14 V page quotes up to 768 kHz and up to 129 dB. We lead with the catalogue numbers and show both, since we found no explanation for the gap. The kit page gives no price, installation method or kit count for a 16-channel processor.
Why the output converter matters most
Music reaches an HDSP-Z16 V in one of two forms. Analogue signals are digitised by the ADC, while digital ones, from the USB player, the optical, coaxial and I2S inputs or the optional HD-BT II-D Bluetooth module, arrive as data. After EQ, crossovers and time alignment, though, everything leaves the same way: through the DAC, which turns the processed numbers back into the analogue voltages on the RCA outputs that feed your amplifiers. Both HDSP-Z16 V models list only analogue RCA outputs, so there is no route around it.
That makes a DAC kit the one converter upgrade that touches every source. If you listen to digital sources as well as analogue ones, it is the only kit of the two that applies to all of them; the ADC Kit B helps analogue inputs alone.
What 120 dB means next to 115 dB
On the catalogue figures, Kit B lowers the converter's noise floor by 5 dB relative to its maximum output; take the kit page's 129 dB at face value and the gap becomes 14 dB. In principle, that shows up as a quieter background between tracks and at low listening levels, where converter noise is most exposed.
In a car, other noise sources usually dominate. Hiss from amplifier gains set too high and whine from ground loops or the alternator are far more common than DAC noise, and road noise covers fine detail once you're moving. Zapco's catalogue says users heard a clearly audible improvement once the AK4490 was fitted, and its kit page repeats the claim; that is the manufacturer speaking, and no independent listening report backs or contradicts it. Get the gain structure right first, and the converter upgrade has a chance to be heard.
How many kits, and which processors
Each DAC Kit B covers eight channels. On the eight-output AD-8A, one kit matches the output count. Zapco doesn't say how many the 16-channel AD-16A needs; for reference, its factory-equipped AD-16G carries two of the eight-channel DAC Kit A modules. Ask us to confirm the count, and the price, before planning a full upgrade.
Zapco's kit page words compatibility as the DSP-Z16V and the other fifth-generation Zapco digital processors, and its accessories page labels the kit an AK4490 DAC module for HDSP-V. In our range, that means the AD-16A and AD-8A.
What owners and reviewers say about the Zapco DAC Kit B
Independent owner reviews of this kit are scarce: we found none we could verify as of October 2026. Zapco's official Facebook page carries a post titled as an announcement of optional DAC upgrades for the HDSP-Z16 and HDSP-Z8, which names this AK4490 kit and the ES9038PRO-based Kit A as shipping. We could only see it as a search preview, and as a manufacturer post it is promotional.
For independent context on the processors themselves, a January 2020 CarMus test of the HDSP-Z16 V praised the modular design that lets owners choose or upgrade the converters. It covers the processors, not this kit, and gives no listening impressions. If you've installed a DAC Kit B, we'd like to hear what you noticed.
DAC Kit B vs DAC Kit A
The Zapco DAC Kit A is the other DAC choice, built on ESS's ES9038PRO and rated at 132 dB in the catalogue (up to 140 dB on its kit page), against Kit B's 120 dB. It is the converter Zapco fits as standard in its G versions, and Zapco's language for it is stronger still. Neither kit has a published Indian price, so the decision will come down to the quote: if Kit A costs little more, it's the obvious pick for a no-compromise build; if the gap is large, Kit B is the more affordable step, delivering 5 dB of the 17 dB that Kit A promises over the standard chip on catalogue figures.
Who should consider it
Consider DAC Kit B if you run an HDSP-Z16 V in a well-sorted system, you use a mix of digital and analogue sources, and you want an upgrade that applies to all of them without paying for the flagship chip, assuming the quote bears that out.
Look elsewhere if your system still has audible hiss, whine or tuning problems; fix those first, because a better DAC won't. If you want the highest published figures, Kit A is the one Zapco positions at the top. And if you haven't bought the processor yet, our explainer on the need for DSP in car audio systems is a better starting point than converter upgrades.
Installation and tuning notes
DAC modules appear to go inside the processor, and we found no installation instructions for this kit. The catalogue page covering the HDSP kits shows a blue plug-in board being inserted into an open HDSP chassis, which points to a board-level job rather than anything you plug in from outside. Have an experienced installer do it with proper static precautions, and ask about warranty implications first.
Afterwards, check the level at the RCA outputs and re-set amplifier gains, since a new converter may not deliver exactly the same voltage as the old one. Re-check the tune as well, because small level differences between channels upset the stereo image. In a hot Indian boot, make sure the processor goes back where it can shed heat, away from amplifier heat sinks. VA3 Car Studio in Ghaziabad installs and tunes Zapco processors.
Price and where to buy
There is no MRP for the DAC Kit B in the 2026 Indian catalogue, and it isn't listed in our online store yet. Ask VA3 Car Studio to order it, and we'll confirm the price and the number of kits your processor needs. The processors themselves are on our AD-16A product page and AD-8A product page, and anything we supply is a genuine Zapco product.
The bottom line
The Zapco DAC Kit B is the measured step up from the HDSP-Z16 V's standard converter: AK4490 in place of AK4458, 120 dB against 115 dB on catalogue figures, eight channels per kit, and an effect on every source. Zapco's claims for it are confident, but nobody independent has reported on it yet. Treat it as a finishing upgrade for a system that's otherwise right, and get a firm quote first.
Zapco DAC Kit B FAQ
What chip does the Zapco DAC Kit B use?
It uses the AK4490 digital-to-analogue converter. The 2026 catalogue rates it at 32-bit, 784 kHz and 120 dB dynamic range in eight-channel form, while Zapco's kit page quotes up to 768 kHz and 129 dB.
Does a DAC upgrade affect every source?
Yes. Every signal leaves the HDSP-Z16 V through its DAC on the way to the RCA outputs, so the upgrade applies to analogue inputs, digital inputs, the USB player and Bluetooth alike.
How many DAC Kit B modules does the AD-16A need?
Zapco doesn't say. Each kit covers eight channels, so one matches the AD-8A's outputs, and Zapco's 16-channel AD-16G carries two of the eight-channel Kit A modules; ask us to confirm before ordering.
Where to Buy the Zapco DAC Kit B in India
We don't list the DAC Kit B online right now, so WhatsApp us to check availability. Zapco's HDSP-Z16 V AD-16A processor is listed along with other car DSP processors, or you can book DSP installation and tuning at our Ghaziabad studio.
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