I'm ready for a sub now, but before I go and buy all I need I'd like to make sure everything will work out in the end. I've gotten help from a couple of you already on this subject, but now I'm ready for my final decision.
Currently I have a Profile AP740 amp
http://www.crutchfield.com/S-QV1wPw5mgYl/cgi-bin/ProdView.asp?g=120&I=489AP740
It's connected to all four of my speakers and I'd like to run a sub off it too. For this, I believe I need a tri-way crossover.
http://www.crutchfield.com/S-EhnlX7vUmz7/cgi-bin/ProdView.asp?i=127TM100
The sub I was planning on using was the Rockford Fosgate P210S4 50-200W rms 400W max.
http://www.crutchfield.com/S-EhnlX7vUmz7/cgi-bin/ProdView.asp?g=67600&I=575P210S4
For the enclosure I'll probably go with a sealed .65 vol. I'm looking for overall good bass.
http://www.crutchfield.com/S-EhnlX7vUmz7/cgi-bin/prodview.asp?wm=fa&I=044H6510SE
My only concerns are whether my amp will be able to give enough power to this sub along with my other four speakers and how is the sound quality when using a tri-way crossover?
Replies (3)
uochronos on 01/1/2005 15:56:26
umm you cant run all 4 speakers plus the sub off this amp without ending with a funny sounding system let me explain. the onyl way to run this woulod be to run all 4 speakers off the front 2 channels. then you have no fade control though the rear and front speakers well not be able to be adjusted like you should be able to.
then run just the sub off both rear channels bridged that well get you 180watts rms at 4ohm. so you well need a 4ohm sub or a sub with dual 2ohm voice coils...
remember that you well have to run all 4 speakers off the front channels of the amp so you well not have any fade control. also you well be running them at 2ohm which increases distortion a bit.
really another mono sub amp 200watts rms or so would probaly be a better choice here IMO. a 200watt mono amp can be had pretty cheap its a relativly small amp..
Chronos
Intrigue on 01/1/2005 16:09:46
Makes sense. I too was thinking about running all the speakers of channels one and two, but when I thought about it some more it didn't seem right. Well, looks like I have a little more work ahead of me, but it'll be worth it in the end. I was worried I'd be trying to make my amp do more than it should so another amp will have to be added. Thanks.
swez on 01/1/2005 18:43:03
Agreed! Tri-Mode can be very awkward to work with. Need a passive crossover for the sub (wastes power) and balancing ohmic loads can be difficult too.
Have played with a few ideas like this too and found that the sub often gets short changed on power needs in tri-mode applications. Especially if the full range speakers are very efficient and the sub is low efficiency. Starves the sub for needed RMS power to balance out with other speakers.
As Chronos mentioned, better off with a separate sub amp. Won't need much here. A Class D amp and a 2 ohm sub (4+4 dvc) are the best combo for efficiency here.
Swez
Currently I have a Profile AP740 amp
http://www.crutchfield.com/S-QV1wPw5mgYl/cgi-bin/ProdView.asp?g=120&I=489AP740
It's connected to all four of my speakers and I'd like to run a sub off it too. For this, I believe I need a tri-way crossover.
http://www.crutchfield.com/S-EhnlX7vUmz7/cgi-bin/ProdView.asp?i=127TM100
The sub I was planning on using was the Rockford Fosgate P210S4 50-200W rms 400W max.
http://www.crutchfield.com/S-EhnlX7vUmz7/cgi-bin/ProdView.asp?g=67600&I=575P210S4
For the enclosure I'll probably go with a sealed .65 vol. I'm looking for overall good bass.
http://www.crutchfield.com/S-EhnlX7vUmz7/cgi-bin/prodview.asp?wm=fa&I=044H6510SE
My only concerns are whether my amp will be able to give enough power to this sub along with my other four speakers and how is the sound quality when using a tri-way crossover?
Replies (3)
uochronos on 01/1/2005 15:56:26
umm you cant run all 4 speakers plus the sub off this amp without ending with a funny sounding system let me explain. the onyl way to run this woulod be to run all 4 speakers off the front 2 channels. then you have no fade control though the rear and front speakers well not be able to be adjusted like you should be able to.
then run just the sub off both rear channels bridged that well get you 180watts rms at 4ohm. so you well need a 4ohm sub or a sub with dual 2ohm voice coils...
remember that you well have to run all 4 speakers off the front channels of the amp so you well not have any fade control. also you well be running them at 2ohm which increases distortion a bit.
really another mono sub amp 200watts rms or so would probaly be a better choice here IMO. a 200watt mono amp can be had pretty cheap its a relativly small amp..
Chronos
Intrigue on 01/1/2005 16:09:46
Makes sense. I too was thinking about running all the speakers of channels one and two, but when I thought about it some more it didn't seem right. Well, looks like I have a little more work ahead of me, but it'll be worth it in the end. I was worried I'd be trying to make my amp do more than it should so another amp will have to be added. Thanks.
swez on 01/1/2005 18:43:03
Agreed! Tri-Mode can be very awkward to work with. Need a passive crossover for the sub (wastes power) and balancing ohmic loads can be difficult too.
Have played with a few ideas like this too and found that the sub often gets short changed on power needs in tri-mode applications. Especially if the full range speakers are very efficient and the sub is low efficiency. Starves the sub for needed RMS power to balance out with other speakers.
As Chronos mentioned, better off with a separate sub amp. Won't need much here. A Class D amp and a 2 ohm sub (4+4 dvc) are the best combo for efficiency here.
Swez
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