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I hate to be one of those guys who always comes to you for questions But I have this amp Kenwood KAC 729S and these subs MTX Thunder 4000 12" Now I have it in a Bandpass box. Now I have 3 questions

1. Bandpass, Sealed or sealed/ported?

2. On the Amp shoud i have mono- or stereo what is the difference?

3. On the amp should i use the crossover and what is the diffrece?

 
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with those subs most definately bandpass. The cones vibrate and distort like crazy so the Bandpass enclosure will greatly reduce cone breakup on those. If you plan on upgrading though...either sealed or ported would sound quite a bit better. Go ported for a little more SPL with better low end extension. Go sealed for best possible sound quality (as a general rule, some subs sound better ported)

ampwise.. a mono or stereo would to fine.. Seeing as in recordings anything below 90HZ is not in stereo anyhow there would be no differences.

You should most definately use the amps built in crossover and set anywhere between 70-90HZ depending on what sounds best to you. (the lower you set it the better for imaging. Because around 85-90hz bass becomes directional and you can hear where it's coming from.

Cheers
Mohawk

 
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Thanks a lot For your help. Now does the size of the sealed box make a diffrence because i am trying to get my trunk space back!!

 
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the size of the box makes ALL the difference.. too small a selaed enclosure will yield you high SPL at higher frequencies but you'll REALLY lose alot of low end bass and it will sound generally not too great. Too big an enclosure you'll have loose sounding bass that seems almost hollow, but have good low end extention.

Regards
Donald
SIA