Zapco HB 68 II Review: 8-Channel DSP for Factory System Upgrades
Updated: Oct 6
The Zapco HB 68 II is an eight-channel digital sound processor with no amplifier inside: six channels of speaker-level input, two RCA inputs, eight RCA outputs and a 31-band equaliser on every output. At ₹24,990 MRP in the 2026 Indian catalogue it sits between the HB 46 II 4A and HB 48 II 4A DSP amplifiers, and it is the only model in Zapco's HB II DSP family without built-in amplification. It suits buyers who want to keep a factory touchscreen and choose their own amplifiers. Today's offer is on our Zapco HB 68 II product page.
At a glance
A pure processor: all eight outputs are line-level RCA feeds, so every speaker needs an external amplifier channel.
Six speaker-level inputs, two more than the HB 46 II 4A and HB 48 II 4A, which helps with factory systems that spread the signal across several channels.
Tuned from a PC or the Android and iOS apps, with 6–48 dB/octave crossovers, delay and 31 bands of graphic or parametric EQ per output.
A 2025 model with almost no owner feedback yet: one five-star rating, without comments, at a European retailer.
Zapco HB 68 II specifications
Specification | Zapco HB 68 II |
|---|---|
Type | 8-channel DSP (no built-in amplifier) |
Equaliser | 31 bands per output, graphic or parametric |
Crossover filters | Butterworth, Bessel, Linkwitz-Riley; 6–48 dB/octave |
Other processing | Input/output matrix, delay, level, polarity |
High-level inputs | 6 channels |
RCA inputs / outputs | 2 in / 8 out |
Other sources | Bluetooth 5.1 streaming, USB music player, OTG input |
Signal-to-noise ratio | More than 100 dB |
THD | Less than 0.05% |
Frequency response | 20 Hz – 20 kHz |
Supply voltage | 12–14.4 V |
Control | PC software, Android and iOS apps, optional HB DSP II-R remote |
Dimensions | 160 x 126 x 45.5 mm |
Warranty | Not stated by Zapco |
India MRP | ₹24,990 |
Figures come from Zapco's official HB 68 II page and its 2025 Quick Guide, checked against the 2026 Indian catalogue. The catalogue prints Bluetooth 5.2 and THD under 1%, while Zapco gives 5.1 and under 0.05%; we have used Zapco's numbers.
Six speaker-level inputs and the factory touchscreen
Most factory touchscreen head units in Indian cars have no RCA pre-outs. Speaker-level (high-level) inputs get round that: the head unit's speaker wires connect straight to the processor, which converts the signal to line level. You keep the steering-wheel buttons, reversing camera, phone mirroring and stock dashboard.
The number of inputs matters more than it first appears. Some factory systems, especially those with their own amplifier, feed tweeters, front woofers and rear speakers from separate channels, sometimes with filtering already applied. Six inputs let the HB 68 II take in all of those feeds, and its input/output matrix decides which input reaches which output. The 4A models stop at four, which can leave a car with separate factory tweeter channels short.
With an aftermarket head unit that has pre-outs, use the RCA inputs instead. The USB player handles FLAC, WAV and APE files as well as MP3.
Eight outputs and no amplifier: planning the system
Because every output is a line-level feed, the HB 68 II makes no sound until amplifiers are connected. A common layout puts four channels on an active front two-way, each tweeter and woofer on its own channel with the DSP doing the crossover, two on rear fill and one or two on a subwoofer amplifier. Keeping passive component crossovers uses fewer outputs and leaves spares for later.
Zapco's own HB II Class D four-channels are the obvious partners: the HB 104D II is rated at 4 x 100 W RMS into 4 Ω and the HB 154D II at 4 x 150 W RMS, and both are the same 45.5 mm tall as the processor. For a subwoofer, the mono HB 501D II is rated at 300 W RMS into 4 Ω, though it isn't in our online store yet. An amplifier you already own works just as well.
Tuning: crossovers, delay and EQ in plain words
Setup runs through Zapco's PC software or the mobile app (HB II DSP on iOS, plus an Android version), which connects over the built-in Bluetooth module. Zapco says the interface is designed to be intuitive for everyone; that's the maker's claim, and a first tune still goes better with a measurement microphone. Our guide on how to set up a DSP in your car walks through the order of work.
Crossovers send each speaker only the frequencies it handles well, using Butterworth, Bessel or Linkwitz-Riley filters. Delay deals with the fact that you sit much closer to one door than the other: holding back the nearer speakers by a millisecond or two (each millisecond is about 34 cm of path) lets both sides arrive together, so the stage centres on the dashboard instead of your shoulder. The 31-band EQ, graphic or fully parametric with frequency, gain and Q per band, then smooths the peaks and dips that glass, seats and door cavities add.
For daily control without the phone, the optional HB DSP II-R remote handles volume, subwoofer level, presets and source. If you're still weighing whether a processor is worth it, our explainer on why car audio systems need a DSP covers the basics.
What owners and reviewers say about the Zapco HB 68 II
Independent reviews are scarce. When we checked in October 2026, we found no written owner, forum or press review of the HB 68 II that we could verify. It is a 2025 model, so the silence isn't surprising, but there is no track record to point to yet.
The only customer signal sits on the product page of European retailer Ahifi: a single five-star rating with no written comments, which tells you very little. The same listing gives an optical input and 160 x 115 x 45 mm dimensions, neither of which matches Zapco's specification, so rely on the official figures.
Everything else is manufacturer material and should be read as promotional, such as Zapco's description of the unit as plug-and-play ready. If you own an HB 68 II, tell us how it has worked in your car.
How it compares with the HB II DSP amplifiers
The closest alternative is the HB 48 II 4A at ₹26,990 MRP. It has the same eight processed channels and eight RCA outputs and adds a four-channel Class AB amplifier rated at 4 x 23 W RMS into 4 Ω, but it accepts only four speaker-level inputs. Choose the 48 for a single box that can run a front stage by itself; choose the 68 if your factory system needs more inputs or all your power will come from separate amplifiers.
The HB 46 II 4A (₹21,990) trims the processor to six channels with the same small amplifier. Further up the range, the HB 810 II 8AD (₹54,990) has a ten-channel DSP, eight speaker-level inputs and eight amplifier channels split between Class AB and bridgeable Class D.
Who should buy it, and who shouldn't
Buy the HB 68 II if you want to keep the factory head unit, plan to run separate amplifiers (or already have them), and want real control over crossovers, delay and EQ.
Look elsewhere if you want one box that powers the speakers too; a 4A model makes more sense then. Skip it, too, if you need an optical input, since Zapco lists none, or want a processor with years of owner feedback. And a DSP left on default settings can sound worse than none, so budget for a proper tune.
Installation notes for Indian cars
At 160 x 126 x 45.5 mm, the HB 68 II will fit under a front seat or behind a glovebox in many cars, but measure first. Keep it away from damp footwells and heater ducting; a parked cabin in May gets far hotter than the air outside. If you'll use the app or Bluetooth streaming, don't bury it behind metal, which shortens Bluetooth range.
Zapco's Quick Guide asks for a fuse or circuit breaker within 18 inches (about 45 cm) of the battery but gives no fuse rating, so size it to the wire. The remote turn-on goes to the head unit's turn-on output or, with most factory units, to an ignition-switched (ACC) supply. Its 12–14.4 V supply rating makes a healthy battery and alternator important, especially at idle with the AC on. VA3 Car Studio in Ghaziabad offers professional installation if you'd rather not tap the factory wiring yourself.
Price and where to buy the HB 68 II
The Zapco HB 68 II has an MRP of ₹24,990 in the 2026 Indian price list. VA3 Car Studio often sells it below MRP; the current figure is on the HB 68 II page in our store. Zapco is distributed in India by Supreme Audiotek Pvt. Ltd., New Delhi, and every unit we sell is genuine.
The bottom line
The HB 68 II suits one plan well: keep the factory touchscreen, add separate amplifiers and tune the car properly. Six speaker-level inputs, eight outputs and full crossover, delay and EQ control cover many factory-system upgrades, and the price leaves money for amplifiers. The catches are the missing owner history and the fact that all your power is bought separately.
Zapco HB 68 II FAQ
Can the Zapco HB 68 II work with a factory touchscreen head unit?
Yes. It accepts up to six channels of speaker-level input, so it can take its signal from the factory unit's speaker wires without RCA pre-outs. The remote turn-on can go to an ignition-switched supply when the head unit has no turn-on output.
Does the HB 68 II have a built-in amplifier?
No. All eight outputs are RCA line-level feeds, so every speaker needs an external amplifier channel. For an eight-channel processor with a small four-channel amplifier inside, look at the HB 48 II 4A, which has four speaker-level inputs instead of six.
Does the HB 68 II have an optical input?
Zapco's specification lists no optical input, only speaker-level, RCA, Bluetooth, USB player and OTG sources. At least one European retailer lists an optical input, but we would go by Zapco's own data.
Buy the Zapco HB 68 II in India
Check the Zapco HB 68 II price in India, browse more Zapco 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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