FM8, when used as a subwoofer, can cover more than a decade of frequency range of servo control from below 20hz to 250hz." While there are already many subwoofers on the market which can play deep bass, their sound quality and transient response degrade as the frequency goes up above 120hz. Customers should note signals above 80hz can be localized and therefore placement is important if FM8 is used above 80hz. For upper end extension, this sub is designed to effortlessly play up to 250hz. The "high" position implements a 4th LR filter to allow FM8 only play down to 50hz and crossover to low bass subwoofer unit at 50hz (for instance, the 50hz/24 setting of our larger subwoofers). The Low-music and Low-HT positions on the extension filter allows FM8 to be used as a regular subwoofer. ![]() FM8 is a variant of F8 subwoofer with a slightly different extension filter arrangement. It features two light cone weight 8" drivers with our Direct Servo technology to ensure accuracy and definition. Here is more on the FM8s from their site: "The subwoofer for audiophiles with the need to play up to upper bassįor audiophiles looking for uncompromising accuracy in both bass and upper bass frequency range and higher crossover frequency up to 250hz, our F8 subwoofer is the ultimate choice. Rhythmic could've just enabled speaker level in and all would've been so much easier. This will undoubtedly also introduce a lot of timing issues. Total of 3 stereo cables (2xRCA + 1 speaker level) to each speaker-sub combo. That means that without speaker level, there needs to be a set of RCAs going from the pre-amp to the FM8 to power the sub (which have their own amp), and then another set of RCAs to feed back the amp with the crossed over signal which then goes to the speakers via the speaker wire. Those are not plain subwoofers: one driver can act as a sub, while the other can be crossed over higher, above 80Hz (thus the need for two FM8s). ![]() Click to expand.I was thinking a setup bit more complicated to take advantage of the intent for which the FM8s are designed.
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