Zapco Z-150.6 II Review: One Class AB Amp for Front, Rear and Subwoofer
Updated: Oct 6
The Zapco Z-150.6 II is a six-channel Class AB amplifier that can run a complete car system on its own: front speakers, rear speakers and a subwoofer, each pair with its own filtering. Zapco rates it at 6 x 165 W into 4 Ω and 6 x 275 W into 2 Ω, or 3 x 550 W bridged into 4 Ω, and gives channels five and six subsonic and low-pass controls for bass duty. Its Indian MRP is ₹1,49,990, which is ₹30,000 above the four-channel Z-150.4 II and just over half the price of the six-channel Z-150.6 AP. It suits a buyer who wants one amplifier, one set of power cables and one mounting position for the whole system. See our Z-150.6 II product page for the current price.
Quick summary
Six Class AB channels at 165 W (4 Ω) or 275 W (2 Ω) each, or three bridged channels at 550 W into 4 Ω.
Filters on every pair, with subsonic and low-pass controls on channels five and six for a subwoofer.
An input selector accepts two, four or six RCA inputs, so a head unit with one pair of pre-outs can drive all six channels.
Two forum threads discuss it, but we couldn't verify any owner opinion as of October 2026.
Zapco Z-150.6 II specifications
Specification | Zapco Z-150.6 II |
|---|---|
Type | 6-channel Class AB sound-quality amplifier |
Power, 4 Ω stereo | 6 x 165 W |
Power, 2 Ω stereo | 6 x 275 W |
Power, 4 Ω bridged | 3 x 550 W |
Minimum load | 2 Ω stereo, 4 Ω bridged |
THD at rated power | Less than 0.05% (product page); less than 0.1% (manual) |
Signal-to-noise ratio | More than 100 dB |
Frequency response | 10 Hz – 30 kHz (±1 dB) |
Input sensitivity | 0.5 – 8 V |
Inputs | 6 x RCA; 2, 4 or 6-channel input mode |
Filters | Variable full / high-pass / low-pass crossover; subsonic filter on channels 5 and 6 |
Bass boost | 0 – 12 dB, variable |
Dimensions | 573 x 190 x 62 mm (614 mm overall length) |
India MRP | ₹1,49,990 |
Specifications are from Zapco's Z-150.6 II page and the 2026 Indian catalogue. Zapco's product page and owner's manual disagree slightly: THD below 0.05% against below 0.1%, and a 10 Hz – 30 kHz (±1 dB) response against 15 Hz – 30 kHz, the figure the catalogue also prints. The catalogue and our listing show six RCA inputs and no outputs, and the fuse rating isn't in our data.
One amplifier, a whole system
The owner's manual lays the channels out for exactly this job. Channels one and two have their own gain, a high-pass filter and a crossover-mode switch, which suits a front component set. Channels three and four add a low-pass filter to the high-pass, so they can run rear speakers or be band-limited for another role. Channels five and six carry a subsonic filter and a low-pass bass crossover: bridge them into a 4 Ω subwoofer and you have 550 W of Class AB bass with its own filtering.
The subsonic filter matters more than it sounds. It strips out content below the subwoofer's useful range, which keeps a ported enclosure from unloading and stops the amplifier spending power on frequencies nobody hears. Use the 0–12 dB bass boost sparingly; an optional dash remote, connected through its own port, puts bass level within the driver's reach.
The input selector completes the picture. Set it to two channels and a head unit with a single pair of pre-outs feeds all six; switch to four or six when your source supplies more signals. With a 0.5–8 V input range, even modest head-unit outputs can drive it fully.
Adding a DSP later
Because every pair has its own inputs, the amplifier also slots neatly behind a processor. Set its crossovers to full range and the bass boost to zero, and let the DSP handle filtering, time alignment and EQ. A common layout uses channels one to four for an active two-way front stage, with tweeters and mid-bass drivers on separate channels, and bridges five and six to the subwoofer. That needs up to six processor outputs, which the eight-output Zapco DSP-Z8 IV AT or HDSP-Z16 V AD-8A cover with room to spare, and both accept speaker-level inputs from a factory touchscreen. Our explainer on how to set up a DSP in your car covers the tuning steps.
What owners and reviewers say about the Zapco Z-150.6 II
Owner discussion exists, but we couldn't verify what it says. When we checked in October 2026, DIYMobileAudio carried a thread collecting feedback and opinions on the Z-150.6 II and another asking whether the Z-150.6 II is worth it. The forum blocked our attempts to open them, so we can't tell you whether members liked it, and we won't guess.
The retailer listings we checked, at World Wide Stereo, Woofers Etc and Target, had no customer reviews. One other store showed a review widget, but its reviews covered the store in general rather than this amplifier, so we left it out. There is, in short, no verified owner feedback on this model yet. If you run a Z-150.6 II, we would welcome your experience.
Z-150.6 II vs Z-150.6 AP, REF 150.6 and Z-150.4 II
The Zapco Z-150.6 AP is the purist alternative at ₹2,69,990. It drops every filter and the input selector, quotes a signal-to-noise ratio above 110 dB against above 100 dB here, and adds 1 Ω ratings for music signal. Per channel it is rated slightly lower at 4 Ω (150 W against 165 W) and the same at 2 Ω, and bridged it manages 3 x 500 W against 3 x 550 W. It is meant to be used with a DSP.
The Zapco REF 150.6 (₹2,39,990) is also control-free, rated by Zapco at 6 x 150 W into 4 Ω, 6 x 220 W into 2 Ω and 3 x 450 W bridged, with lower rated distortion (under 0.02%) and socketed op-amps; at 480 mm it is shorter but 20 mm wider. If four channels are enough, the Zapco Z-150.4 II saves ₹30,000 and is 135 mm shorter overall, but loses the dedicated subwoofer pair.
Who should buy it, and who should look elsewhere
Buy it if you want front, rear and subwoofer amplification from one Class AB chassis, plan to run it from a head unit now with the option of a processor later, and have a mounting spot for a 614 mm amplifier.
Look elsewhere if you are building a fully active, DSP-tuned system from day one, where the control-free AP or REF six-channels may fit better, or if your subwoofer needs far more than 550 W. Buyers who want other owners' experience first should know that none is verifiable yet.
Installing it in an Indian car
Length is the first hurdle. At 614 mm overall and 190 mm wide, it needs a dedicated board across the boot floor, a ventilated false floor or the back of a rear seat, and larger SUVs offer more room than hatchbacks or compact SUVs. Measure before you buy, and leave clearance at both ends for wiring.
Heat is the second. Six Class AB channels idling together produce warmth even when the music is quiet, so give the fins open air and never bury the amplifier under carpet. After the car has been parked through a Delhi afternoon, hold off on long full-volume sessions until the cabin has cooled.
Zapco quotes its ratings at 14.4 V, and an idling engine with the AC on supplies less, so expect a little less headroom in traffic. Size the power cable and main fuse from the owner's manual, and recheck the terminals after a few weeks of rough roads. VA3 Car Studio in Ghaziabad installs single-amplifier systems like this and can set the crossovers and gains for you.
Price and where to buy
The Z-150.6 II is listed at ₹1,49,990 MRP in the 2026 Indian catalogue. We often sell below MRP, so see our Zapco Z-150.6 II store page for the current price. It is a genuine Zapco amplifier, distributed in India by Supreme Audiotek Pvt. Ltd.
The bottom line
The Z-150.6 II is the most self-sufficient of Zapco's Z-II, AP and REF Class AB amplifiers: six channels, filtering on every pair, a subwoofer-ready third pair and an input selector that copes with simple head units. It gives up the AP's noise rating, and owner feedback is still unverified. For a buyer who wants a full Class AB system from one box, with or without a DSP, it is the obvious Zapco to shortlist.
Zapco Z-150.6 II FAQ
Can the Zapco Z-150.6 II run speakers and a subwoofer at the same time?
Yes. Channels one to four can drive front and rear speakers, and channels five and six can be bridged into a 4 Ω subwoofer at 550 W, using their subsonic and low-pass controls. That covers a complete system from one amplifier.
Does the Z-150.6 II need a DSP?
No. Its onboard filters and input selector let it run straight from a head unit's pre-outs. A DSP adds time alignment and detailed EQ, and if you add one later, set the amplifier's crossovers to full range so the two don't overlap.
How is the Z-150.6 II different from the Z-150.6 AP?
The Z-II has crossovers, bass boost, a subsonic filter and an input selector, is rated at 165 W rather than 150 W per channel at 4 Ω, and costs ₹1,20,000 less. The AP has gain only, quotes a higher signal-to-noise ratio and adds 1 Ω ratings for music signal.
Buy the Zapco Z-150.6 II in India
Check the Zapco Z-150.6 II price in India, browse more Zapco amplifiers or compare all car amplifiers in India. Want it fitted properly? Book amplifier installation at our Ghaziabad studio.
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