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<blockquote data-quote="Chromatic" data-source="post: 8228008" data-attributes="member: 659121">I can only speak for my Bass Knob -- It isn&#039;t called a &quot;bass boost&quot;.. But when I turn it all the way down NOTHING comes from the sub.. all power is cut at all frequencies going to that sub channel,.. So it&#039;s not just one frequency, it could only be a gain remote of some sort.. or some serious attenuation of all frequencies, which has the same effect as a gain adjustment knob.This is on a PPI 900.5 Amp,.. Maybe I got lucky with the architecture of this amp and the remote knob,..&nbsp;&nbsp; Any &quot;bass boost/enhancement&quot; I have would be through my headunit.. which I don&#039;t use,.. I use Level increases in the headunit to get the full voltage from the pre-outs on the Sub channel.. but other than that there&#039;s no &quot;boost&quot; at X frequency going on.I believe I have my Rears and fronts tuned at 80hz Highpass.. and Sub at 80hz lowpass.. (I may have it a little different for a touch of overlap.. but I can&#039;t recall specifics off hand).But a Bass knobs with a frequency selector on one end, and the &quot;gain&quot; on the other for the frequency you have selected would be VERY handy for tuning.. Then a setting on the knob to &quot;all&quot; where it would simply gain up and down all the frequencies you have your low pass set to allow for your sub.&nbsp; But, With my amp&#039;s hpf and lpf (bandpass) and the Headunit also having triple crossovers (for Front, Rears, and Sub) I have sort of a &quot;double protection&quot; going on.. with the precise X-over points dialed in the amp,.. and the general ones for safeguards on the headunit, as I noticed my headunit doesn&#039;t attenuate nearly as much as the amp as it approaches the cutoff frequencies.</blockquote>

[QUOTE="Chromatic, post: 8228008, member: 659121"] I can only speak for my Bass Knob -- It isn't called a "bass boost".. But when I turn it all the way down NOTHING comes from the sub.. all power is cut at all frequencies going to that sub channel,.. So it's not just one frequency, it could only be a gain remote of some sort.. or some serious attenuation of all frequencies, which has the same effect as a gain adjustment knob. This is on a PPI 900.5 Amp,.. Maybe I got lucky with the architecture of this amp and the remote knob,.. Any "bass boost/enhancement" I have would be through my headunit.. which I don't use,.. I use Level increases in the headunit to get the full voltage from the pre-outs on the Sub channel.. but other than that there's no "boost" at X frequency going on. I believe I have my Rears and fronts tuned at 80hz Highpass.. and Sub at 80hz lowpass.. (I may have it a little different for a touch of overlap.. but I can't recall specifics off hand). But a Bass knobs with a frequency selector on one end, and the "gain" on the other for the frequency you have selected would be VERY handy for tuning.. Then a setting on the knob to "all" where it would simply gain up and down all the frequencies you have your low pass set to allow for your sub. But, With my amp's hpf and lpf (bandpass) and the Headunit also having triple crossovers (for Front, Rears, and Sub) I have sort of a "double protection" going on.. with the precise X-over points dialed in the amp,.. and the general ones for safeguards on the headunit, as I noticed my headunit doesn't attenuate nearly as much as the amp as it approaches the cutoff frequencies. [/QUOTE]

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