Deaf Bonce MF-15S Review: 800 W, a 28 Hz Fs and the 100-Litre Box It Asks For
Updated: Oct 6
The Deaf Bonce MF-15S is a 15-inch Machete subwoofer driver rated at 800 W RMS (1,600 W max), with a 2.5-inch copper voice coil, 14 mm of linear excursion and a free-air resonance of just 28.0 Hz in its dual 2 Ω (D2) form; a dual 4 Ω (D4) version is also offered. Its India MRP is ₹26,990, the highest of the three 800 W Machete MF subs we list and just below the 1,200 W MF-12R and MF-15R. It suits SUV and MPV owners who have the space for a big box and want deep bass. See today's offer on our Deaf Bonce MF-15S product page.
Quick summary
A 15-inch cone, 800 W RMS and a 28.0 Hz Fs (29.0 Hz for the D4), well below the 35.0 Hz of the 12-inch MF-12S.
Deaf Bonce's manual recommends a 100-litre ported box with a 300 cm² port, tuned to 32 Hz, so boot space is the deciding factor.
The D2 wired to 1 Ω suits the MLA-800 (790 W); the D4 wired to 2 Ω suits the MLA-1000 (680 W).
No owner or press reviews were available to us, so this review uses Deaf Bonce's published figures.
Deaf Bonce MF-15S specifications
Specification | Machete MF-15S |
|---|---|
Type | 15-inch (381 mm) subwoofer driver |
Voice coils | Dual 2 Ω (D2) or dual 4 Ω (D4) |
Voice coil | 2.5-inch, copper wire |
Power handling | 800 W RMS, 1,600 W max |
SPL | D2 85.8 dB; D4 85.1 dB |
Fs | D2 28.0 Hz; D4 29.0 Hz |
Qts | D2 0.68; D4 0.79 |
BL | D2 16.1 T·m; D4 21.5 T·m |
Vas | D2 86.2 litres; D4 78.6 litres |
Xmax / Xmech | 14 mm / 28 mm |
Construction | Paper cone, foam surround, ferrite magnet, steel frame |
Mounting depth | 179.3 mm |
Cut-out diameter | 354.0 mm |
Gross weight (packed) | 9.15 kg |
Recommended box (manual) | Ported, 100 litres, 300 cm² port 70 cm long, tuned to 32 Hz |
India MRP | ₹26,990 |
Driver figures for both versions are from Deaf Bonce's MF-15S D2/D4 page and match our listing. The box recommendation is from the MF-series manual linked on that page.
Reading the parameters: deep, compliant and high-Q
Three figures stand out. The Fs of 28.0 Hz means the driver resonates low in free air. The Vas of 86.2 litres (78.6 for the D4) describes a very compliant suspension. And the Qts of 0.68 for the D2, rising to 0.79 for the D4, is high. Drivers with figures like these generally want a lot of air behind them: forced into a small box, their in-box resonance and Q climb, and the bass turns boomy rather than deep.
The two versions also differ noticeably. The D4 has a much stronger BL (21.5 against 16.1), a higher Qts and a smaller Vas, so any box designed from scratch should use the parameters of the version you actually buy.
The 100-litre box Deaf Bonce recommends
Deaf Bonce's manual for the MF-series gives the MF-15S a ported enclosure of 100 litres (3.5 cubic feet) with a 300 cm² port 70 cm long, tuned to 32 Hz. That is double the 50 litres it suggests for the MF-12S. The manual pairs it with a subsonic filter 5 Hz below the tuning, about 27 Hz here, a low-pass between 63 and 80 Hz and no bass boost, plus about 40 hours of running-in at medium power.
A box that size, with a long port inside it, is a serious piece of furniture. Have it designed for your vehicle so the port fits and the box doesn't block seats or the spare wheel.
Wiring and amplifier pairing
The D2 gives 4 Ω with its coils in series or 1 Ω in parallel; the D4 gives 8 Ω or 2 Ω. Always connect both coils. Using Deaf Bonce's 14.4 V ratings:
One D2 at 1 Ω on the MLA-800: 790 W, practically the full 800 W rating, with the amp at its 1 Ω minimum.
One D4 at 2 Ω on the MLA-1000: 680 W, 85 per cent of the rating, with the amp running at the easier 2 Ω load.
One D2 at 4 Ω on the MLA-1500: 540 W, conservative. The same amp would give a D4 at 2 Ω 920 W, more than the rating.
A pair of MF-15S subs would need two 100-litre boxes, which many cars cannot accommodate, so most owners will run one. Output falls at idle with the AC on, so judge the system with the engine running at normal speed.
What owners and reviewers say about the Deaf Bonce MF-15S
When we checked in October 2026, we found no owner reviews, forum threads or press tests of the MF-15S that we could read and verify. Deaf Bonce's product page and manual are manufacturer material, and the marketplaces and car audio forums we tried either had nothing on this model or blocked access to their review pages.
Without real owner reports, we won't summarise a reputation it hasn't been given. If you've installed an MF-15S, we'd value your feedback.
MF-15S vs MF-12S and MF-15R
The MF-12S (₹23,990 MRP) shares the 800 W rating, 2.5-inch coil and 14 mm Xmax, with a slightly higher 86.0 dB SPL figure and a 50-litre recommended box. For most cars it is the more practical choice; the MF-15S makes sense when you have the space and want the lower resonance of the bigger cone.
The MF-15R (₹29,990 MRP) is the 1,200 W, 3-inch CCAW version of the same size, with 15 mm Xmax and a 182.0 mm mounting depth. Its manual also recommends a 100-litre, 32 Hz box, so the decision is mostly about how much amplifier power you plan to buy. For the budget 10-inch end of the range, see the ML-10S.
Who should buy it, and who shouldn't
Buy the MF-15S if you drive an SUV or MPV that can give up around 100 litres to a box, you want deep bass from an 800 W-class amplifier rather than a 1,200 W one, and you're willing to have the enclosure properly designed.
Look elsewhere if you drive a hatchback or a typical sedan, or need the boot for luggage. The MF-12S or MF-10S need half the recommended box volume or less, at the same 800 W rating.
Installation notes for Indian cars
The MF-15S needs a 354.0 mm cut-out and 179.3 mm of mounting depth, and at 9.15 kg packed it makes for a heavy enclosure. A 100-litre box with its port usually lives against the seat backs of a large SUV or in the cargo area behind the last row, so measure carefully and check that rear seats can still fold or recline.
Anchor the box with proper brackets or straps; on rough roads a loose 15-inch enclosure is dangerous. Run fused, heavy-gauge power cable sized to the amplifier, ventilate the amp, and treat the tailgate and rear panels, which a 15-inch will find quickly; our sound damping guide explains the approach. VA3 Car Studio in Ghaziabad can design and build the box and install the system.
Price and where to buy
The MF-15S has an MRP of ₹26,990 for either version. We often sell below MRP; choose D2 or D4 and check today's price on the Machete MF-15S D2/D4 listing. Ask us to quote the box and amplifier alongside it.
The bottom line
The MF-15S is the space-hungry, low-resonance member of the 800 W Machete MF subs we list: a 28.0 Hz Fs, high Qts and a 100-litre recommended box. In the right SUV, matched with an MLA-800 or MLA-1000, it is built for the low bass its parameters suggest; in most other cars, the MF-12S is the easier fit. Owner feedback is still missing, and we'd welcome it.
Deaf Bonce MF-15S FAQ
How big a box does the Deaf Bonce MF-15S need?
Deaf Bonce's manual recommends a ported box of 100 litres with a 300 cm² port 70 cm long, tuned to 32 Hz. That is twice the box it suggests for the 12-inch MF-12S, so it suits large SUVs and MPVs.
Should I buy the D2 or D4 MF-15S?
Choose by amplifier. A D2 wired to 1 ohm gets 790 W from a Deaf Bonce MLA-800; a D4 wired to 2 ohms gets 680 W from an MLA-1000. The two versions have different parameters, so design any custom box for the one you buy.
Is the MF-15S better than the MF-12S?
Not for every car. Both are rated at 800 W RMS, but the MF-15S has a lower Fs of 28.0 Hz and needs a 100-litre box, while the MF-12S has a 35.0 Hz Fs, a 50-litre box and a slightly higher SPL figure. Choose by the space you have.
Buy Deaf Bonce Subwoofers in India
Check the Deaf Bonce Machete MF-15S D2/D4 15-Inch Subwoofer 800W RMS price in India, browse more Deaf Bonce subwoofers or compare all car subwoofers in India. Want it fitted properly? Book subwoofer installation at our Ghaziabad studio.
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