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#1
06-09-2006, 03:23 PM
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quick question
if an amp is rated at 75w x 4 RMS,
how many watts would that produce at 2 channels 2 Ohms? 300W x 2 RMS @ 2 Ohm??
__________________
R.I.P.: My Thunderbird "Ricks 96".. 2/08/96 - 1/14/05.  
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#3
06-09-2006, 09:19 PM
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Re: quick question
Well it would have to be 1ohm stereo stable, but anywhere between 150 and 600 x 2
__________________
'01 Black Sentra SE Weapon-R intake, HS header, HKS catback, ES motor mounts, B&M short shifter, Tein coilovers Alpine 9835, Adire Koda 6.1, Adire Brahma 15, Arc 2100cxl, Linear Power 2.2hv, Cadence ZRS-8 '05 Silver WRX STi Injen SES Downpipe, HKS Carbon-Ti catback, Cobb Stage 2 Tune, TiC Super Shifter, TiC Klunk Killer, Tein springs, Nitto NT555R Drag Radials
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#5
06-12-2006, 11:36 AM
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Re: quick question
this is one thing I never really understood. How do you calculate wattage when you bridge an amp? Other than just what the box says.
I don't understand why the amp would have to be 1ohm stereo stable.
__________________
R.I.P.: My Thunderbird "Ricks 96".. 2/08/96 - 1/14/05.
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#6
06-12-2006, 01:34 PM
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Re: quick question
because each channel of the amp will only be seing a 1 ohm load when the total resistance is 2 ohms.
__________________
2001 Ford ZX-2 Alpine CDA-9855 SAX 100.4 Rainbow CMX 265 front stage Stock 5X7 rear fill Hifonics BX1505D TC-5200
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#7
06-12-2006, 06:57 PM
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Re: quick question
Quote:
Say an amp does 25x2 @ 4ohm and 50x2 @ 2ohm. That amp would have to put out sqrt(25*4)=10Vrms per channel before clipping to pull that off. If it's only 2ohm stereo stable, then the maximum current the amp can support is 10/2=5 amps. When you bridge, the voltage from the L and R channels add together, so your bridged channel is putting out 20Vrms. If it's putting out 20V, and can only support 5 amps, then the minimum impedance it can safely run at when bridged is 20/5=4ohm.
__________________
'01 Black Sentra SE Weapon-R intake, HS header, HKS catback, ES motor mounts, B&M short shifter, Tein coilovers Alpine 9835, Adire Koda 6.1, Adire Brahma 15, Arc 2100cxl, Linear Power 2.2hv, Cadence ZRS-8 '05 Silver WRX STi Injen SES Downpipe, HKS Carbon-Ti catback, Cobb Stage 2 Tune, TiC Super Shifter, TiC Klunk Killer, Tein springs, Nitto NT555R Drag Radials
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#8
06-13-2006, 03:54 PM
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Re: quick question
that was really hard to understand, but I get it. I never would have figured that out myself. Thanks.
__________________
R.I.P.: My Thunderbird "Ricks 96".. 2/08/96 - 1/14/05.
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