hmmm, so is the whole 3db efficiency boost effective with the drivers i have??? if so, it doesnt really matter if i do use normal amps that are suited to 4 ohm, cos the drivers are more effficeint...
interesting... i think ill go the clarion anyway, i like the look, and four wont be too hard to hide, they are small....
1
getting power at 8 ohm....
Started by Shreknos, Nov 04 2009 09:32 PM
25 replies to this topic
#16
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Posted 05 November 2009 - 05:32 PM
RS Sport "SQ Edition"
Clarion HXD2
Crescendo Opus 8.6
Fi Audio Q 12"
JL Audio 300/4
JL Audio 500/1
Clarion HXD2
Crescendo Opus 8.6
Fi Audio Q 12"
JL Audio 300/4
JL Audio 500/1
#17
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Posted 05 November 2009 - 05:39 PM
Maybe you've chosen the wrong drivers for your application then?
There are some decent midbass drivers that are 94-5 db efficient, which would give you more output.
There are some decent midbass drivers that are 94-5 db efficient, which would give you more output.
#18
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Posted 05 November 2009 - 05:42 PM
Get some pro drivers. The ones im putting in the torana are 96db and are 4 ohm. and they are 10 inch. Dont restrict yourself to car audio drivers.
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#19
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Posted 05 November 2009 - 05:57 PM
i got the sls, cos i got them at a great price, there excursion, distortion and look is what im after...
the exclusives are the same, i traded off eficiency for super low distortion and and responce...
bit late now, i probably should have looked in the pro audio stuff, but i dont regret my decision... ill just power em up...
the exclusives are the same, i traded off eficiency for super low distortion and and responce...
bit late now, i probably should have looked in the pro audio stuff, but i dont regret my decision... ill just power em up...
RS Sport "SQ Edition"
Clarion HXD2
Crescendo Opus 8.6
Fi Audio Q 12"
JL Audio 300/4
JL Audio 500/1
Clarion HXD2
Crescendo Opus 8.6
Fi Audio Q 12"
JL Audio 300/4
JL Audio 500/1
#20
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Posted 05 November 2009 - 06:07 PM
OK, thats fair enough. The sls are great drivers and with that much power even at 8 ohm will be plenty loud.
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#21
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Posted 05 November 2009 - 06:14 PM
Sorry to hijack, but I think its slightly relevant, what happens with amps with regulated power supplies? Do they continue to make rated maximum power into 8ohm speakers?
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Posted 05 November 2009 - 07:29 PM
Gonadman2, on Nov 5 2009, 06:14 PM, said:
Sorry to hijack, but I think its slightly relevant, what happens with amps with regulated power supplies? Do they continue to make rated maximum power into 8ohm speakers?
No, the correct definition for a regulated power is the same output power across a large voltage range, and they should double power for every halving in load impedence, so 200w @ 4 ohm from 10.5v to 14.4v for example and 400w @ 2 ohm from 10.5v to 14.4v. The example you have given is something similar to the RIPS system JL uses which just manipulates rail voltage to control output power.
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#23
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Posted 05 November 2009 - 09:14 PM
^^^ Yes the JL was what I was thinking of as I have the JL amps and 8 ohm speakers. I am curious as to what would happen in this case?
Would maximum rail voltage occur at 4 ohms, and therefore maximum power into 8 ohms would be exactly half?
Would maximum rail voltage occur at 4 ohms, and therefore maximum power into 8 ohms would be exactly half?
#24
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Posted 05 November 2009 - 09:22 PM
The JL HD750/1 are 750RMS at 4 ohm, so about 375RMS at 8 ohm, up to 2kHz or so IIRC
otherwise the HD 600/4 is 2x300RMS at 8 ohm - could be an option there maybe, or a couple of 450/4 - one for left @ 150x1 + 300x1 per amp @ 8 ohms...
and the 300/2 is 300x1 bridged at 8 ohms.
otherwise the HD 600/4 is 2x300RMS at 8 ohm - could be an option there maybe, or a couple of 450/4 - one for left @ 150x1 + 300x1 per amp @ 8 ohms...
and the 300/2 is 300x1 bridged at 8 ohms.
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#25
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Posted 06 November 2009 - 10:39 AM
Go to jaycar and buy three 2x150 amps and one 4x100 amp. Thats only $1000 and gives you the power you are after.
Bridge a 2x150 to each 8inch woofer giving 340wrms to each 8inch.
Bridged the 4x100 to each midrange to give 260wrms to each 4inch.
Run a single 2x150 for the tweeters giving 150wrms to each tweeter.
That power is spot on. The tweeters are more sensitive so you dont need as much power.
Bridge a 2x150 to each 8inch woofer giving 340wrms to each 8inch.
Bridged the 4x100 to each midrange to give 260wrms to each 4inch.
Run a single 2x150 for the tweeters giving 150wrms to each tweeter.
That power is spot on. The tweeters are more sensitive so you dont need as much power.
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#26
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Posted 06 November 2009 - 11:39 AM
if your budget is 2500k, then call marty from fhrx. He has a few zapco reference amps still in boxes. They will definately do the job. maybee not 400rms, but they won't let you down.
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