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I'm looking at buying a more versitile subwoofer plate amp. But call me stupid, I don't understand what GAIN, BANDWIDTH and level mean. I understand the basic frequency cutoff. But not how these two interact with the volume and rolloff control???
charles
Follow Ups:
Gain is the volume of the sub, bandwidth is for the parametric EQ, level is for the amoont of EQ applied.
At least it was there on my O-Audio plate amp.In other words, it's something like "increase by 5 dB loudness of everything that lies within +/- 5 Hz of 33 Hz".
Edits: 07/23/12
It's right next to the bandwith control (where you would expect it to be).
Might be some semantics involved.
Does this new plate amp have both a "gain" and "level" adjustment? I would find that odd... Typically, amps are voltage amplifiers (not current amplifiers). Amps increase the voltage a specific amount with a predefined "gain". The level control reduces the input level to the gain stage so the *net* voltage gain is controllable. These level controls are also known as attenuators.
As for bandwidth, subs can have 1 or 2 selectable rolloff regions. All subs will have what is called a low-pass filter, with slopes that are commonly 12 or 18db/octave, with some as steep as 24db/octave. This keeps the high frequences out of the sub. A 2nd filter is a high-pass filter which prevents super-low subsonic frequencies from eating up amp power and causing needless excursion of the woofer. When used with subs, high-pass filters are referred to as "infrasonic" or "subsonic" or "rumble" filters. The "bandwidth" of the sub is based on the highpass and lowpass filter settings. Most subs would operate from about 15 or 20Hz to anywhere from 60 to 180 Hertz, depending on application and placement. Without a high-pass filter, the low-end of the subs rolloff is determined by subwoofer driver parameters (such as Fs, Vas, Qts, etc.) and enclosure parameters (such as enclosure type, volume, port lengths, port mouth area, etc. etc.)
But all semantics aside, what sub are you buying this amp for? What driver? What enclosure? And what sub amps are you looking at?
Cheers,
Presto
I was looking into Rythimic, but the cost may knock it out of the running. Then I was looking into Dayton. Later I will look into a driver and build an enclosure myself. Or just look into one of Parts Express's kits.
This is for my Marantz PM8004 integrated amp and Monitor RX-2 speakers. The RX2's have an 8" woofer and do a nice job of getting down cleanly into a solid 70-80hz range. I find many speakers claiming to go down to 60hz but in real life listening - they don't!
Thank you for a very nice explaination.
charles
The section on the left handles relative output level and low pass frequency. The right section controls equalization if you choose to use it. There "level" is amount of boost or cut.
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