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What's more efficient |
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SamV 
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Joined: 21 October 2008 Location: London Status: Online Points: 5021 |
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 Topic: What's more efficientPosted: 22 January 2012 at 12:06am |
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Which is the more efficient way to run amp? At 4x 8r stereo or 2x 4r bridged?
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Radiance Audio http://www.radianceaudio.co.uk | Bikeology http://www.bikeology.net
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infrasound
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Posted: 22 January 2012 at 12:24am |
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Which amplifier are you talking about?
A few rules of thumb with class D amps: Higher impedances are more efficient than lower. Idle losses make up a massive proportion of the consumed power. System efficiency is generally highest at full power, with an 8 ohm load.
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infrasound
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Posted: 22 January 2012 at 12:26am |
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Best way to do this is to buy one of these http://www.hobbyhot.com/hobbyhot-p0-high-voltage-and-precision-wattmeter-pr-2633.html
And measure the power consumption of your system at 90db pink noise and full power pink noise to find the most efficient way. You'll need an SPL meter to keep the measure the level accurately!
Edited by infrasound - 22 January 2012 at 12:26am |
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SamV
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Posted: 22 January 2012 at 12:45am |
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The amp is a car amp, a Vibe Litebox 4.
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infrasound
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Posted: 22 January 2012 at 12:49am |
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4*8 ohms should be more efficient.
I advise buying one of those little power-meters though. You'll learn alot about how best to run your system
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SamV
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Posted: 22 January 2012 at 12:54am |
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Well for one it won't fit my 4awg cables :) Easy enough to modify?
Edited by SamV - 22 January 2012 at 12:54am |
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infrasound
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Posted: 22 January 2012 at 12:58am |
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Well, they can take up to 130A if you need them to
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slaz
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Posted: 22 January 2012 at 3:19am |
I have the 2-channel version of that .... working well with 2 x 8R PA-type speakers paralleled across the bridged o/p. Stable/sweet-sounding when driven quite hard .... gets a bit warm ... so need to get around to modding it with a fan. Yours should drive 4 x 8R peakers in this way well .... BTW this is not a class D design - calls itself class GH. More efficient than class AB though. |
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REMEMBER....POLITICIANS AND DIAPERS SHOULD BE CHANGED OFTEN AND FOR THE SAME REASON
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SamV
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Posted: 22 January 2012 at 3:28am |
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What sorta run times you getting of which battery?
I'll be high passing around 80hz and will have a 110ah battery. |
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slaz
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Posted: 22 January 2012 at 3:38am |
Generally was getting about 5 hours from a well-used 45Ah car battery - no HPF other than the built-in subsonic - playing reggae. Would have thought you'd get at least 6-7 hours with a good 110Ah leisure battery .... should be a fair bit more if you HPF at 80. |
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REMEMBER....POLITICIANS AND DIAPERS SHOULD BE CHANGED OFTEN AND FOR THE SAME REASON
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SamV
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Posted: 22 January 2012 at 3:45am |
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Thought as much :) You're gonna love and laugh at the new system lol.
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Saturnus
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Posted: 22 January 2012 at 7:37am |
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That entirely depend on what impedance the amp is designed for. A typical car audio amp is more efficient with a 4 ohm load than a 8 ohm load. If we're talking class D amp that is. For almost all other amp types like class AB and class G/H, those are generally more efficient the higher the impedance. Edited by Saturnus - 22 January 2012 at 7:40am |
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SamV wrote: