OK,
I have an Alpine CDA-7892 HU. I'll list what it can do, then the 3 questions that I have at the end:
It has Bass control which allows you to set the center frequency to 60-70-80-90-100-130-150-180hz, and a Bass band width which allows you to select a wide or narrow band width of whatever frequency you happened to choose.
Treble center freq control which allows you to select 10-12.5-15-17.5Khz.
High pass and low pass filters which can be set to Flat-80-120-160hz.
Time correction that delays the audio signal to the speakers by milliseconds to allow the speakers to sound like they're the same distance away, for better sound staging.
OK, if your'e still with me, my questions are...
1)How do I know where to select a center frequency, and how large of a bandwidth?
I tend to play with these a lot, and worry about not letting my speakers sound their best.
2)HPFs and LPFs should never overlap right?
Both my front speakers (CDTs) and subs (infinity perfect 10")s can handle a lot of the same frequencies, and I want to optimize them all with the best possible sound (already got some advice on this to set them both at 80hz).
3) When I install my CDTs should I put my sony 5 1/4" speakers in the back (dodge dakota) without any crossing over, hooked up just to the HU (for rear fill)?
any and all suggestions will be appreciated SMILE
Replies (2)
cplkittle on 02/11/2004 18:56:05
not sure about q # 1
q# 2, Setting the LPF and HPF at the same frequency, IMO, would be ideal since both usually have a 12-18dB/octave cutoff.. There will be minimal overlapping, but enough to blend / fade nicely. As far as what frequency to set it at, that is up to your ears. If the CDTs reproduce 80Hz cleanly, then that would be a good suggestion. On the other hand setting it too high will make your subs sound too boomy ie 150-180Hz. I would suggest starting at 80Hz on both, and trying a sine sweep (found on most bass / stereo test CDs)...adjust until the transition is smooth from front to rear as the sweep approaches and passes the crossover frequency.
3) again this is something that I would test.. putting the sonys in the rear is a good idea, but don't let them cloud the clarity of your front stage. maybe turn the gain down a little on the rear fill, and let the CDTs do the majority of the work.
ttocs on 02/12/2004 23:40:25
they are toys........ We cannot really tell you where to put them. They are made accessable through the deck so that they can be easily, and often changed.
x-over freqs are ok to over lap....
If you have the speakers, I would use them, or at least try them.
I have an Alpine CDA-7892 HU. I'll list what it can do, then the 3 questions that I have at the end:
It has Bass control which allows you to set the center frequency to 60-70-80-90-100-130-150-180hz, and a Bass band width which allows you to select a wide or narrow band width of whatever frequency you happened to choose.
Treble center freq control which allows you to select 10-12.5-15-17.5Khz.
High pass and low pass filters which can be set to Flat-80-120-160hz.
Time correction that delays the audio signal to the speakers by milliseconds to allow the speakers to sound like they're the same distance away, for better sound staging.
OK, if your'e still with me, my questions are...
1)How do I know where to select a center frequency, and how large of a bandwidth?
I tend to play with these a lot, and worry about not letting my speakers sound their best.
2)HPFs and LPFs should never overlap right?
Both my front speakers (CDTs) and subs (infinity perfect 10")s can handle a lot of the same frequencies, and I want to optimize them all with the best possible sound (already got some advice on this to set them both at 80hz).
3) When I install my CDTs should I put my sony 5 1/4" speakers in the back (dodge dakota) without any crossing over, hooked up just to the HU (for rear fill)?
any and all suggestions will be appreciated SMILE
Replies (2)
cplkittle on 02/11/2004 18:56:05
not sure about q # 1
q# 2, Setting the LPF and HPF at the same frequency, IMO, would be ideal since both usually have a 12-18dB/octave cutoff.. There will be minimal overlapping, but enough to blend / fade nicely. As far as what frequency to set it at, that is up to your ears. If the CDTs reproduce 80Hz cleanly, then that would be a good suggestion. On the other hand setting it too high will make your subs sound too boomy ie 150-180Hz. I would suggest starting at 80Hz on both, and trying a sine sweep (found on most bass / stereo test CDs)...adjust until the transition is smooth from front to rear as the sweep approaches and passes the crossover frequency.
3) again this is something that I would test.. putting the sonys in the rear is a good idea, but don't let them cloud the clarity of your front stage. maybe turn the gain down a little on the rear fill, and let the CDTs do the majority of the work.
ttocs on 02/12/2004 23:40:25
they are toys........ We cannot really tell you where to put them. They are made accessable through the deck so that they can be easily, and often changed.
x-over freqs are ok to over lap....
If you have the speakers, I would use them, or at least try them.
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