01-29-2013 07:47 PM
My built in (crown) amplifier DSP has a "pre EQ" and "post eq" available and both are similar or same looking PEQ. What is the difference and which should I use for speaker tunings?
You sure it's not pre x-over and post x-over eq?
01-30-2013 03:41 AM
Pretty much as stated.
Pre. crossover. There is a eq section that is before the crossover which , in the electronic realm , effects freq. before the crossover. As an example if you have a 100hz crossover point and you do some eq changes "around' 100hz "depending on Q. related to freq." it still will be heard both in the 100hz and below crossover out as well as the 100hz and above crossover freq. out.
Post Crossover Eq. changes will be effected in just the crossovers output band selected in the electronic realm. Each crossover bandpass out has a eq secton in it. For an example if a sub out pandpass is set 40 to 100 hz and you boost 100 hz in your sub bandpass eq. out it will not change 100hz in the electronic out in the next bandpass. An example would be if your subwoofer, in its acoustic output response , has a peak in its response at 100 hz you could tame that area just in the sub bandpass eq section while at the same time if your next bandpass low mid box has a drop in response at 100 hz you can boost this area in its output without effecting the subs acoustic output.
Most people setup a multiway speaker system using Post Crossovers eq,delay,all pass filter (if available) section to get the system as a whole to work together for the best possible response. Then use the Pre. Crossover eq section for over all room for room tweeking.
I haven't worked with your amp or its DSP section so these examples are just for a general idea as to Pre crossover , Post crossover eq useage.
01-30-2013 01:40 PM
with the dsp built in the amp both pre and post will only effect speaker components driven by that particular amp channel. does this make them essentially the same?
Depends on what Mode the input section is setup as.
It could be setup so channel A is feeding the crossover. After the crossover the low freq from channel A is fed to 1 amp channel the High pass is sent to another amp channel. This gives channels A Pre Crossover eq to do Room for Room tweeking for both High Pass amp Channel and Low Pass amp channel. The Post Crossover Eq available on each amp channel can be used for Bandpass eq,delay etc.
If the amp is setup for Stereo input then yes the Pre Crossover eq and Post crossover eq effects each Bandpass pretty much the same way. This does give you more filters to use per output.
Depends on how the amp is setup and of course if the amp can be setup that way.
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