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For audiophiles looking for uncompromising accuracy in bass, upper bass, and higher crossover frequencies up to 250Hz, our FM8 subwoofer is the ultimate choice. It features two low mass 8" drivers with our Direct Servo technology to ensure accuracy and definition.
The Low-music and Low-HT positions on the extension filter allows the FM8 to be used as a regular subwoofer. The "high" position implements a 4th order LR filter to allow FM8 to only play down to 50Hz and crossover to low bass subwoofer unit at 50Hz.
For upper end extension, this sub is will effortlessly play up to 250Hz. FM8 can cover more than a decade of frequency range from below 20Hz to 250Hz.
Direct Servo Technology
All our subwoofers use our patented Direct Servo technology, providing high end performance at an affordable price. It allows us to use lighter and more efficient drivers and still achieve deep bass without using excessive amounts of power. The servo reduces memory effects, counteracts thermal compression and various forms of driver non linearities.
HX585 Amplifier and DS800 Driver
FM8 uses two Hypex Ucd class D modules in the power amplifier with each module independently driving an 8" driver. Hypex Ucd modules are considered as one of the best sound quality class D modules available. The standard amplifer is HX585 (300WRMS x 2 for a total of 600WRMS), It has two RCA inputs and one highpass filter output. Three different finishes are available: piano black, black matte vinyl, and black oak vinyl.
FM8 is particularly suitable for pairing with front speakers with small woofer or planar/ribbon speakers with limited extension. Customers are tempted to use them as speaker stands. This usage method severely limits the placement choice and hence also hinders the efficiency. For front speakers with 8" or larger woofers, we recommend other 12" or larger models such as F12.
Features & Options
Product features include:
All our subwoofers feature our Direct Servo technology, which is our secret to achieving tight and accurate bass. The benefits are far more than simply achieving low distortion.
Learn more in our technology articles
Dual 8" cast frame paper cone high excursion drivers
Driver features include:
Our enclosures are very solid and well braced to minimize any cabinet resonance or coloration. The enclosure is heavily braced and the sub has a net weight of 53 lbs.
We also provide a range of finishes. Our range of attractive and excellent value vinyl finishes including:
Black piano gloss finish is also available in our signature edition.
FM8 features a unique bass extension control, shown below.
|The bass extension control enables the user to customize the frequency response of the low end for the best trade-off between output and extension. If set to low music, bass below 18 Hz will be filtered. The damping factor of this mode is 0.5 for the best time domain response. However, the disadvantage is slower attenuation of subsonic signals. For HT application, we recommend low-HT mode which incorporates a 3rd order highpass filter to filter out subsonic signals below 20hz. 50hz/24 setting implements a 50hz 24db L-R filter, recommended when using FM-8 as a midbass module to work with larger low bass subwoofer crossovered at 50hz 24db slope.|
To suit different setups, we provide a 12 db and 24 db/octave crossover (as shown in the above photo) with adjustable range from 50hz to 200hz.
FM8 accepts two RCA inputs and one channel RCA HPF @150hz output. The HPF is derived from L input only. Plugging same signal to both L and R inputs increase the gain by 6db.
PEQ in FM8 is similar to those in our models except the frequency has doubled. Room modes between 50hz and 150hz is very common because of ceiling height. Using FM8 to cover that frequency band with PEQ can affectively alleviate the problem.
120V-240 Switchable Voltage Selection
Correct voltage must be selected before use. Voltage switch is shown below.
The bass extension switch allows the user to customize the deep bass extension and the rumble filter to control cone excursion. For HT application, one can set the extension to Low-HT or High for higher SPL output. For music one may prefer a lower cut off such as Low-Music setting. Changing the settings can also result in a better integration with the acoustic gain of the room.
|Driver||dual 8" high excursion with custom sensing coil|
|Driver materials||paper cone with lightweight foam surround|
|Cast aluminum basket|
|Aluminum flux de-modulation shorting rings|
|Amplifier||600WRMS class D (dual Hypex Ucd modules) patented servo controlled|
|Dimensions||11-1/2"(W) x 20" (H )x 15-1/2" (D) with grille and amplifier knobs|
|Shipping Weight||68 lbs|
|Frequency Response||18 - 250 Hz (-3 dB @ 20Hz) 50-250hz (at "HIGH" bass extension setting)|
|Crossover slope||Selectable 12 or 24 dB / octave|
|Crossover range (Low pass)||50 - 200 Hz|
|Rumble Filter (High pass )||20 Hz 18 dB / octave|
|Phase response||120 degrees phase shift at 20 Hz|
|Phase adjustment||0 - 180 degrees continuously variable|
|Bass damping factor||Low music (Q=0.5), Low-HT(Q=0.9), and high (Q=0.8)|
|Standy power||7W (standby, red light), 13W(ON,green light)|
|Finishes||Available in black matte vinyl or black oak vinyl|
|(Piano Gloss available in signature edition only)|
|Warranty||5 years warranty on driver and 3 years on electronics|
|45 day satisfaction guarantee|
In the chart below, with bass extension controls set to Low Music, the response is 3 db down at 20Hz. The response is flat and extended.
FM8 features bass extension switch similar to F8, allowing users to select among 3 different modes: Low Music (Q=0.5), Low HT (with a 18db/oct rumble filter at 20hz), and High (24db L-R filter at 50hz). In the following, we plot the FR of HIGH position (also known as the midbass module position).
FM8 provides a 12/24 db/oct switchable low pass filter to so that it can easily integrate with any front speakers.
Another aspect of getting a correct integration is phase alignment between the front speakers and the sub. We have written a guide on how to achieve a phase aligned subwoofer. F8 has a phase/delay adjustment knob. More
Many of our customers marvel that we are able to produce such exceptional subwoofers at such a low price. Our Direct Servo technology makes it possible, allowing us to get the most out of an 8" driver without the need for kilowatts of power. Don't be fooled into thinking that other more expensive subwoofers with much more powerful amplifiers will offer more output. The output of a subwoofer is determined by how much air the driver can displace, not the power rating of the amplifier. We could supply a more powerful amplifier, but there would be no increase in output, only extra cost.
These are some of the finest subwoofers ever manufactured and the difference in sound quality between these subwoofers and the typical big-box ported subwoofer is surprising. You will hear the difference the very first time you listen and as so many have said, you will never go back to a non-servo subwoofer.