ESB Harmony HR 11 SW Review: Spare-Wheel Active Subwoofer, Specs and Price
The ESB Harmony HR 11 SW is an active spare-wheel subwoofer: a built-in Class D amplifier rated 200 W RMS / 400 W max drives a dual voice coil woofer in a die-cast aluminium housing, and our listing says it fits inside the rim of the spare tyre. Its MRP is ₹44,990, the highest of the four Harmony models we list and ₹20,000 above the HR 10 US under-seat sub. It suits a buyer who wants a dedicated bass unit without giving up boot space and will have it fitted professionally. See it on our ESB Harmony HR 11 SW product page; our Harmony Hard Rock series overview covers the whole range.
Quick summary
Built-in Class D amplifier, 200 W RMS / 400 W max, driving a dual voice coil woofer in a die-cast aluminium housing.
Fits inside the rim of the spare tyre, per the listing. It measures 360 × 360 × 126 mm and no rim sizes or vehicles are named, so measure first.
Remote included for volume, phase (0°/180°), crossover (50–150 Hz) and bass boost (up to 12 dB).
Input types are not listed and we found no independent owner reviews, so get the inputs confirmed before pairing it with a factory head unit.
ESB Harmony HR 11 SW specifications
Specification | ESB Harmony HR 11 SW |
|---|---|
Type | Active spare-wheel subwoofer |
Amplifier | Class D, 200 W RMS / 400 W max |
Woofer | Dual voice coil (diameter not listed) |
Housing | Die-cast aluminium |
Frequency response | 30 Hz – 160 Hz |
Sensitivity | 92 dB (1 W / 1 m) |
Crossover | 50 – 150 Hz, adjustable |
Bass boost | 0 – 12 dB |
Remote control | Included: volume, phase (0°/180°), crossover, bass boost |
Inputs | Not listed |
Dimensions | 360 × 360 × 126 mm |
Warranty | Terms and duration set by ESB Audio; confirm India terms with us |
MRP on our store | ₹44,990 |
All figures come from our store listing; we could not open a maker's datasheet to cross-check them in October 2026. Treat not listed as unconfirmed, not absent.
Spare-wheel fit: what the listing says and what to measure
Our listing describes the fit simply: the HR 11 SW sits inside the rim of the spare tyre. It gives the unit's size, 360 × 360 × 126 mm, but names no rim sizes or vehicles and does not say how the unit is secured. Measure the inside diameter and depth of your own spare's rim against those dimensions, and ask us to check fitment before ordering.
The listing's selling point is bass without giving up boot space. One practical point: the spare exists for punctures, so before anything is fitted, work out with your installer how you would get to the spare on the roadside with the unit in place.
Class D amplifier, power and remote controls
The amplifier is Class D, a design that turns less of the power it draws into heat than Class AB. The listing gives 200 W RMS and 400 W max. Plan around the RMS figure, the continuous rating, and read 400 W as a maximum rather than output the unit holds.
The remote covers volume, phase (0°/180°), crossover (50–150 Hz) and bass boost (up to 12 dB); the listing does not say whether it is wired or wireless. A sensible start is a crossover near 80 Hz, then flip the phase on a familiar bass-heavy track and keep the setting that sounds fuller from the driver's seat. Use the boost sparingly, because clipped bass sounds worse than less bass.
Inputs are the open question: the listing does not say whether the unit takes low-level (RCA) signals, speaker-level signals or both. Our Harmony series overview describes low and high inputs and a wired remote for the active subs, but the listing does not name the input types or say whether the remote is wired, so ask us to confirm both. With a factory touchscreen that has no RCA outputs, make sure the input type is confirmed before you buy. Our guide to the need for an amplifier in car sound systems is useful background.
What owners and reviewers say about the ESB Harmony HR 11 SW
When we checked in October 2026, we did not find independent owner reviews or published tests of the HR 11 SW that we could read and link to. This post is not based on our own testing either, so the figures above are the listing's claims, not measured results.
The one brand-side page we could open was a YouTube channel named ESB Audio, which describes the brand as an Italian tradition since 1969. It has no product detail for this model, and as brand material it is promotional, not a review.
Please do not read the lack of reviews as a verdict. If you own an HR 11 SW, tell us which rim and car you fitted it to and how it behaves at idle with the AC on.
ESB Harmony HR 11 SW vs the HR 10 US and other ESB options
The nearest sibling is the ESB Harmony HR 10 US, the other active sub in the Harmony range we list: a Class AB amplifier rated 130 W RMS / 260 W max in a 78.5 mm-high chassis that the listing describes as designed to fit under a front seat, at ₹24,990. The HR 11 SW lists 70 W more RMS and costs ₹20,000 more. Their frequency figures differ on paper, 30–160 Hz against 10–150 Hz, but neither listing gives a tolerance, so treat them as listing figures, not measured output. The HR 10 US lists low-level and high-level inputs; for the HR 11 SW they are not listed.
If you can spare boot space for a box, ESB's Tremila range includes the 3.WB8, an 8-inch active subwoofer box; see our ESB 3.WB8 review and the Tremila subwoofer overview.
Who should buy it, and who shouldn't
Buy the HR 11 SW if you want a powered sub that leaves the boot floor free, your spare's rim has room for a 360 × 360 × 126 mm unit, and you want remote control of the settings.
Look elsewhere if your car has no spare wheel or the rim cannot take the unit, if you need confirmed speaker-level inputs for a factory stereo, or if you want owner reviews before spending ₹44,990. On inputs, the under-seat HR 10 US, whose listing names both types, is worth a look.
Installation notes for Indian cars
Heat comes first. A sub working hard in summer traffic, then baking in a parked car, needs clear space around its housing. The listing says die-cast aluminium but not whether it doubles as the amplifier's heatsink, so keep luggage and cable bundles off it.
Dust and water come next. The spare-wheel area sits low in the car, where water and dust can collect, and the listing gives no ingress-protection rating. Check for standing water after rain or a car wash, and keep connectors off the floor.
Then power. No fuse rating or current draw is listed, so follow the maker's instructions for cable size and fuse value; as a rule, fuse close to the battery and ground to bare body metal. An older battery idling in traffic with the AC on can pull system voltage down, and bass output can suffer. Bass also finds loose trim, so see our guide to applying sound damping in a car. VA3 Car Studio in Ghaziabad offers professional installation.
Price and where to buy
The ESB Harmony HR 11 SW has an MRP of ₹44,990 on our store. VA3 Car Studio often sells below MRP, so check the current offer on the HR 11 SW product page. We list it as a genuine ESB Audio product. Warranty terms and duration are set by ESB Audio, so confirm the India details with us before ordering.
The bottom line
The ESB Harmony HR 11 SW is a niche answer to a common problem: bass without a box in the boot. On paper it offers a 200 W RMS Class D amplifier, a remote and a housing the listing says fits inside the spare's rim. In practice you are buying on the listing's word, since we found no independent reviews, and fit depends on your rim and car. Measure first, get the inputs confirmed and have it fitted professionally.
ESB Harmony HR 11 SW FAQ
Does the ESB Harmony HR 11 SW need a separate amplifier?
No. The listing describes a built-in Class D amplifier rated 200 W RMS / 400 W max, so the unit is active. It still needs a fused power feed, a ground and a signal source, and its input types are not listed.
Will the ESB Harmony HR 11 SW fit my spare wheel?
The listing says it fits inside the rim of the spare tyre and gives its size as 360 × 360 × 126 mm, but names no rim sizes or vehicles. Measure your spare's rim and ask us to check fitment before ordering.
How much does the ESB Harmony HR 11 SW cost in India?
The MRP on our store is ₹44,990. We often sell below MRP, so check the product page for the current offer.
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