coozer
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| posted on 28/6/15 at 02:53 PM |
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Speaker watt add up?
My amp gives out 2 x 750w @ 4 ohms.
I want to get some 6x9s and a couple sub's.
At the moment I have a dual coil 1200w sub using both channels off the amp.
So, if I go for a 6x9 and a sub on each side how do I work out the size of speaker?
Is it as simple as 250w 6x9 and a 500w sub to total 750w??
Or, can I use 750w 6x9 and 750w sub??
1972 V8 Jago
1980 Z750
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Slimy38
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| posted on 28/6/15 at 03:30 PM |
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Depending on how you wire it, you'll either end up with 2 ohms (parallel) or 8 ohms (series). That will change the power available.
You'll need something to protect the 6x9 as well, wiring them with a sub will push them to their limits before the sub is even troubled.
Personally I'd go for the amp powering the subs on their own, and something like a 100w second amp for the top end. Then you can balance the
two.
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coozer
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| posted on 28/6/15 at 03:34 PM |
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Was thinking of in series with a low pass filter to the subs.
At 8 ohms the amp is 500w per channel..
1972 V8 Jago
1980 Z750
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tegwin
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| posted on 28/6/15 at 03:34 PM |
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If you need a second amp I have a brand new one kicking around in its box. Yours for not very much
------------------------------------------------------------------------------------------------------------------------
Would the last person who leaves the country please switch off the lights and close the door!
www.verticalhorizonsmedia.tv
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bi22le
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| posted on 28/6/15 at 07:27 PM |
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Ohms are added when in series. Most speakers are 4 ohm. Subs are often 2 ohm or even 1.
I would not recommend running 8 ohm. Unheard of in my day. the proper way to drive a pair of 6 X9 and sub is off a 4 channel amp. Bridge two channels
for the sub. 6X9 can be run very successfully off of the head unit. Dont be fooled by the max watts, the RMS will be half or quarter that.
Hope this helps.
Track days ARE the best thing since sliced bread, until I get a supercharger that is!
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http://www.locostbuilders.co.uk/forum/13/viewthread.php?tid=139152&page=1
Me doing a sub 56sec lap around Brands Indy. I need a geo set up! http://www.youtube.com/watch?v=EHksfvIGB3I
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MikeRJ
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| posted on 29/6/15 at 06:55 AM |
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quote:
Originally posted by coozer
Was thinking of in series with a low pass filter to the subs.
At 8 ohms the amp is 500w per channel..
You can't run a full range speaker and a sub in series and get anything like good results. The impedance of the sub+crossover will vary
significantly across the band, which means drive to the 6x9s will also vary. As others have said, use a separate amp for the full range speakers.
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dubzter
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| posted on 29/6/15 at 11:08 AM |
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quote:
Originally posted by bi22le
Ohms are added when in series. Most speakers are 4 ohm. Subs are often 2 ohm or even 1.
I would not recommend running 8 ohm. Unheard of in my day. the proper way to drive a pair of 6 X9 and sub is off a 4 channel amp. Bridge two channels
for the sub. 6X9 can be run very successfully off of the head unit. Dont be fooled by the max watts, the RMS will be half or quarter that.
Hope this helps.
What he said  4 channel amp is the way to go.
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