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How much power do speakers actually consume? (normal listening)
How much power do speakers actually consume? (normal listening)
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Old 11th October 2017, 12:51 PM   #1
youandme is offline youandme
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Default How much power do speakers actually consume? (normal listening)

Not far ago I attend a hifi presentation there's a room having the Wilson Alexx driven by some CH Precision mono amps. The amps rated 1400W at 4ohm, but there're some UV stuff on the amps' panel, usually appears 2W or 3W, rarely climax raises to 20W but immediately drops to normal. So with smaller speakers (simpler xos than the ones in those big boys'), is it ok to use a good 30W amp? And smaller rooms even requires less power than those big public rooms.
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Old 11th October 2017, 01:20 PM   #2
kaputt is offline kaputt  Germany
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Maybe that's helpful: A Test. How much Voltage (power) do your speakers need?
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Old 11th October 2017, 01:23 PM   #3
KatieandDad is offline KatieandDad  United Kingdom
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You'll be surprised how little RMS power you actually need. The extra power is used to give you headroom for dynamic range.
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Old 11th October 2017, 01:27 PM   #4
indianajo is offline indianajo  United States
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I use my Peavey SP2-XT at about 1.5 Vpp base level in my 14'x33'x11' music room. That is about 1/6 W into 8 ohms. Those speakers are 101 db @ 1 w 1 m. That is very sensitive.
Recorded classical music such as 1812 overture has about a 55 or at the outside 70 db dynamic range. 1/6 w doubled 5 times would be ~ 5 watts.
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Old 13th October 2017, 12:07 PM   #5
AndrewT is offline AndrewT  Scotland
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Quote:
How many power do speakers actually consume?
from post 1 header.

The speaker consumes about 99% of the power delivered to it.
The remaining 1% comes out as audio, unless it is a high efficiency speaker where you may get 2% as audio or a very high efficiency speaker where maybe 5% comes out as audio.
Extreme efficiency horns can get upto 30% to 50% as audio power, meaning that only 70% to 50% of the input is consumed and thus they run quite a bit cooler and can be driven harder than low efficiency speakers.
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Old 13th October 2017, 12:53 PM   #6
adason is offline adason  United States
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this has been discussed ad nauseam
no need to open another thread
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Old 13th October 2017, 01:41 PM   #7
nigelwright7557 is offline nigelwright7557  United Kingdom
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I found out quite early on I needed an amp with a high voltage power supply, at least +/- 55 volts.
With lower voltages the transients get clipped too soon.
Unless it is compressed, music can have a large dynamic range.
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Old 13th October 2017, 09:08 PM   #8
wg_ski is offline wg_ski  United States
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If VU meters are hitting "20 watts" you're probably using up all of a +/-55 volt supply.
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