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Old 27th July 2010, 11:25 PM   #1
ul9601 is offline ul9601  New Zealand
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Default noob question re: crossover

Hi all,
I have a Pioneer KPX-9000 HU and I'm leaning towards getting an equalizer with a built-in amplifer for now, and upgrade to an equalizer with a preamp out later on when fund allows.
If my understanding putting together a system is any good (doubt it), I have three possibilities for 4 speakers and a sub configuration.

1) HU->Crossover->Equalizer->Speakers
& Sub Amp->Sub from the crossover

2) HU->Equalizer->Crossover->Speakers
& Sub from the crossover

3) HU->Equalizer->Crossover->Speakers
& Sub Amp with High Level Input->Sub from the crossover

Do any of the above make (practical) sense?
Cheers,
Sam
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Old 28th July 2010, 03:15 AM   #2
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Option 2 seems like your best bet. That being said a lot of crossovers also split the mids from the tweets (where you mention speakers).
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Old 28th July 2010, 11:01 AM   #3
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Some (maybe all) of the KPX head units had very low output signal (~70mv?) so they'll only work well with the old Pioneer component system components. This will limit your options.
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Old 28th July 2010, 10:27 PM   #4
ul9601 is offline ul9601  New Zealand
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ok - what is the typical preamp output voltage for modern headunits?
so it's not simple as turning up the amp, then? - sorry about all these noob questions.
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Old 28th July 2010, 10:32 PM   #5
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My headunit has 5V or 6V preouts (Pioneer Premier DEH-P980BT). I think most are in the range of 1-7V. This would mean your headunit is up to 2 orders of magnitude below the required range.
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Old 28th July 2010, 10:35 PM   #6
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Typical maximum preamp voltage for a normal/common head unit is between 2 volts and 4 volts. Most amplifiers can produce full power with input as low as 200mv but there aren't many that can produce full power with 70mv. Does your head unit have the output voltage printed on the label with the model number?
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Old 28th July 2010, 11:05 PM   #7
ul9601 is offline ul9601  New Zealand
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Most of the texts on the label are not really legible. I consider myself lucky to have decyphered the model number to be honest...
I'll have a look though when I get home.
Thanks guys.
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Old 29th July 2010, 07:16 AM   #8
ul9601 is offline ul9601  New Zealand
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nope - i can't read any other info on the label than 12VDC -ve ground...
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