identical subs sound different

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Ketel22

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Joined: August 23, 2003

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Posted: October 23, 2003 at 9:33 PM / IP Logged

i have two identical kappa perfect 12.1 and when i play each one alone they have a seperate tone, one is higher than the other. if i play them together the sound is lower and spl is lower than with only one sub, i am running the off of a rockford power 1000a2.

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bberman1

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Posted: October 23, 2003 at 9:40 PM / IP Logged

Are you sure they are in phase?

Ketel22

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Joined: August 23, 2003

Location: United States

Posted: October 23, 2003 at 9:59 PM / IP Logged

how would they be out of phase? im just confused beyond belief right now, ive never had this happen before, the subs are in a shared box with a seperation brace in the trunk of my mothers 03 altima. its a rockford 2channel amp rated and 275x2@4ohm the subs have a rms value of 350 and are svc 4ohm subs. this phase thing is completely new to me, plz help.

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nedgeworth

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Posted: October 23, 2003 at 11:21 PM / IP Logged

What phase reffers to is make sure you have the - of the amp going to the - of the sub and likewise for the + side. Also do you have the same problem when running the sub of the same channel on the amp?

wvsquirrel

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Posted: October 24, 2003 at 12:12 AM / IP Logged

The different tones could come from several things, like manufacturing defects in the sub and/or small differences in the chamber sizes of the enclosure. Are you using a Ported or Sealed enclosure? If you're using a ported enclosure, the ports may be tuned differently.

With phase you have 2 settings, 0 and 180 degrees. With 2 SVC's wire like nedgeworth said: + to + and - to - running 1 sub per channel (stereo).

Squirrel

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Ketel22

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Posted: October 24, 2003 at 2:17 AM / IP Logged

the subs are in seperate chambers of a sealed enclosure. what can i do to trouble shoot this problem? i will try running them off the same channel this weekend.

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wvsquirrel

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Posted: October 24, 2003 at 2:28 AM / IP Logged

try using the same chamber for each sub, as well as the same channel from the amp. When you were only running 1 sub were you just using the right or left channel, or did you bridge the amp?

If you use the same chamber and same amp channel to run each sub (1 at a time), then more than likely any differences would be due to a manufacturer defect or minor difference in the subs.

Squirrel

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Ketel22

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Posted: October 24, 2003 at 2:45 AM / IP Logged

i am using the amp in stereo, so i need to take both and and listen to them in the same chamber on the same channel. is that correct? and if there is a difference, i sould be able to get a new sub yes?

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DYohn

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Posted: October 24, 2003 at 7:28 AM / IP Logged

You are probably hearing the differences beyween the enclosures, possibly aided by differences between the amp channels. Run the speakers in mono - if you can't bridge tha amp because of impedence loading, at least set the gains at the same point - lowest possible setting is best - and be sure you are sending a mono signal to both channels. Is the crossover for both channels set to the same frequency? Send the subs a test tone and see if they both reproduce it properly.

But, the biggest thing that can affect the SQ besides the driver itself is the enclosure. Slight differences in size, damping, porting, speaker mounting, etc. can make a big difference in sound. I'd bet you don't need a new speaker as much as you need to correct problems in the enclosures and/or the amplifier setup. Besides, if you listen to them both and they both work but sound slightly different, which speaker is defective?

wvsquirrel

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Posted: October 24, 2003 at 7:42 AM / IP Logged

Yes, listen to them from the same channel and the same chamber. To isolate an enclosure issue, listen to them both from the same channel and the same chamber, then use that same channel but switch chambers. If the subs sound the same in one chamber but not the other, then you've got some tweaking to do with the enclosure.

Squirrel

"No more Cpt. Kirk chit chat"

If its too loud, then you're too old

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