Recoil SL1708 Review: Round 8-Inch Under-Seat Subwoofer With a 20 Hz Subsonic Filter
The Recoil SL1708 is an amplified 8-inch subwoofer in a round die-cast aluminium housing just 80 mm (3.1 inches) high, rated 120 W RMS and 500 W peak. It takes RCA or high-level inputs, adds a 20 Hz subsonic filter, and comes with a remote and an OFC wiring kit. The Indian MRP is ₹27,000. It suits a buyer with a small boot or a tight under-seat gap who wants a self-contained unit and would like to see its working voltage and fuse rating on paper before wiring it. The unit is on our SL1708 product page.
Key takeaways
The built-in amplifier is rated 120 W RMS and 500 W peak. Recoil's own title leads with the 500 W max figure, so read the RMS line.
Working voltage, fuse rating, subsonic filter, input sensitivity and THD are all listed. The working voltage and fuse rating appear for none of the other four powered Recoil subwoofers we list.
The housing is round, 245 mm across and 80 mm high, and a wiring kit is in the box.
We found no owner reviews to summarise.
Recoil SL1708 specifications
Specification | Recoil SL1708 |
|---|---|
Type | Amplified under-seat subwoofer, 8 in |
Amplifier | 120 W RMS / 500 W peak, PWM MOSFET power supply |
Inputs | RCA low level; high level with auto turn-on |
Input sensitivity | Adjustable, 5 V to 0.1 V |
Low-pass filter | 40 – 150 Hz |
Bass boost | 0 – 12 dB at 50 Hz |
Subsonic filter | 20 Hz |
Phase | 0° / 180° |
THD | Less than 1.0% |
Working voltage | 9 – 16 V DC |
Fuse | Single 25 A |
Protection | Thermal, short circuit, overload |
Housing | Die-cast aluminium, 245 x 80 mm (9.6 x 3.1 in) |
Included | Level remote, mounting brackets, OFC wiring kit |
India MRP | ₹27,000 |
Figures come from Recoil's SL1708 page, which is promotional material, and our listing. Neither gives an impedance or a frequency response. Recoil's additional-information table also prints a weight and a 10.6 x 15.8 x 8 in size without saying what they measure, so we use the 245 x 80 mm figure from its specification table, which our listing repeats.
A round case for small spaces
Recoil describes the SL1708 as a round, wheel-shaped enclosure that fits under seats, behind truck seats or in small boots. A round housing has no corners to catch on a seat frame, and its 245 mm diameter is the footprint you have to find room for.
An 8-inch driver in a case this size is a way to add low-end weight to a stock system, not to match a 12-inch box, so set your expectations on the 120 W RMS rating and not the 500 W peak. Recoil lists heavy-duty mounting brackets and a die-cast aluminium housing.
Voltage, fuse and the subsonic filter
This is where the SL1708 gives you more to work with. Its working voltage is published as 9 V to 16 V DC, which matters in Indian stop-start traffic where the system voltage can sag with the AC and headlights on. Recoil lists a single 25 A fuse rating for the unit. Whatever the rating, fit the fuse holder close to the battery.
The 20 Hz subsonic filter trims signal below the range an 8-inch driver can usefully reproduce, so the amplifier does not spend power on it. Alongside the 40 to 150 Hz low-pass and the phase switch, the adjustable input sensitivity, from 5 V down to 0.1 V, lets the unit work from a weak RCA signal or a stronger speaker-level one.
What owners and reviewers say about the Recoil SL1708
When we checked in October 2026, Recoil's SL1708 page showed no customer reviews. We found no owner thread, retailer review or published test that we could open and read, and several large retailer and video sites would not load for our research. That limits what we can verify; it does not mean nobody has one fitted.
We prefer to say that than to guess at a consensus. If you own an SL1708, leave a comment and share how it works in your car.
SL1708 vs RLS10 and LAS10
The Recoil RLS10 is about the same thickness at 75 mm, with a 10-inch driver, 150 W RMS and a lower MRP of ₹20,000, but a larger rectangular footprint and no published peak, fuse or filter ranges. The Recoil LAS10 lists 200 W RMS and 600 W peak at the same ₹27,000, and gives no dimensions.
Of the three Recoil powered under-seat units we list, the SL1708 is the one whose listed contents include a wiring kit, and the one with a published fuse rating and voltage range. It has the lowest RMS rating of the three.
Who should buy it, and who shouldn't
Buy it if you need bass from a small, round case, want the electrical figures on paper before you wire it, and would like the cable kit included. It suits a hatchback or sedan where boot space is precious and expectations are modest.
Look elsewhere if you want the most output you can get, since 120 W RMS is the lowest of the five powered Recoil subwoofers we list, or if you need the impedance and frequency response published. The Recoil SW10P needs boot space but is rated at 300 W RMS, more than double.
Installation notes for Indian cars
Choose the spot first: under a seat with enough height for 80 mm plus the brackets, or flat in a corner of the boot. Bolt it down through the brackets so it cannot roll or slide on rough roads, and keep it clear of seat rails and any wiring under the seat.
Use the OFC kit for the power run, ground to bare metal, and put the remote where you can reach it. Confirm fitment for your car with the maker if the space is tight. VA3 Car Studio in Ghaziabad offers professional installation.
Price and where to buy
The Recoil SL1708 has an MRP of ₹27,000 in our listing. VA3 Car Studio often sells below MRP, so check the current offer on the SL1708 product page. We list it as a genuine Recoil product.
The bottom line
The Recoil SL1708 is a small powered subwoofer that publishes its voltage range and fuse rating: 120 W RMS, a 20 Hz subsonic filter, and a wiring kit in the box. It is a modest bass add-on for tight spaces, not a loud one, and there are no owner reviews to say more. Judge it on the RMS rating and the space you have.
Recoil SL1708 FAQ
What does the 500 W in the Recoil SL1708 title mean?
It is the peak figure. Recoil's own title says 500 Watts Max, and the built-in amplifier is rated 120 W RMS and 500 W peak. Compare subwoofers on the RMS rating.
Does the SL1708 work with a factory radio?
Recoil lists high-level inputs with auto turn-on for factory OEM radios, plus an RCA input for aftermarket head units. Whether your car offers a suitable tap depends on the car, so confirm fitment for your car with the maker before ordering.
What does the SL1708's 20 Hz subsonic filter do?
It trims signal below 20 Hz, which an 8-inch driver cannot usefully reproduce, so the amplifier does not spend power on it. It works alongside the 40 to 150 Hz low-pass filter.
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