About the real power of an amplifier.

dex13 · 17th August 2007, 10:01 AM

Hi all,

Some time ago I bought a subwoofer speaker – Hertz HX 200, 4ohm, 8". It was stated 300W continuous power, 600W peak. I measured it at 50Hz and I don't think it can handle more than 25 Volts RMS (35V peak), which is about 150W RMS.

Now I look at the amplifiers and the cheapest one (Blaupunkt GTA-280) offers "RMS power (4 ohms) 1 x 210 W". Hm... what should I expect from this amplifier? Will it be too much for this speaker or these 210W RMS are not RMS calculated in this way?

Please excuse my bad English, and thanks in advance for your advices.
Regards.

richie00boy · 17th August 2007, 10:33 AM

Look if it's continuous rating at 20-20kHz and what battery voltage. Being Blaupunkt it's probably quite accurate rating.

dex13 · 17th August 2007, 11:44 AM

I found only this in the manual: RMS power in accordance with CEA-2006 (< 1% dist. / +14.4V)

richie00boy · 17th August 2007, 12:15 PM

That is a good sign.

acid_k2 · 17th August 2007, 12:23 PM

An ampli rated 210W RMS at 14.4V can drive a 8" 300W speaker.

For "quality" audio listening, trim ampli output at normal-low level....
For "boom boom" audio listening, trim ampli output at more high level, and pray your subwoofer doesn't fire...

17th August 2007, 10:01 AM	#1
dex13 diyAudio Member Join Date: Aug 2007	About the real power of an amplifier. Hi all, Some time ago I bought a subwoofer speaker – Hertz HX 200, 4ohm, 8". It was stated 300W continuous power, 600W peak. I measured it at 50Hz and I don't think it can handle more than 25 Volts RMS (35V peak), which is about 150W RMS. Now I look at the amplifiers and the cheapest one (Blaupunkt GTA-280) offers "RMS power (4 ohms) 1 x 210 W". Hm... what should I expect from this amplifier? Will it be too much for this speaker or these 210W RMS are not RMS calculated in this way? Please excuse my bad English, and thanks in advance for your advices. Regards.

17th August 2007, 10:33 AM	#2
richie00boy Did it Himself diyAudio Member Join Date: Nov 2003 Location: Gloucestershire, England, UK	Look if it's continuous rating at 20-20kHz and what battery voltage. Being Blaupunkt it's probably quite accurate rating. __________________ www.readresearch.co.uk my website for UK diy audio people - designs, PCBs, kits and more

17th August 2007, 12:15 PM	#4
richie00boy Did it Himself diyAudio Member Join Date: Nov 2003 Location: Gloucestershire, England, UK	That is a good sign. __________________ www.readresearch.co.uk my website for UK diy audio people - designs, PCBs, kits and more

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17th August 2007, 11:44 AM	#3
dex13 diyAudio Member Join Date: Aug 2007	I found only this in the manual: RMS power in accordance with CEA-2006 (< 1% dist. / +14.4V)

17th August 2007, 12:23 PM	#5
acid_k2 diyAudio Member Join Date: Oct 2006	An ampli rated 210W RMS at 14.4V can drive a 8" 300W speaker. For "quality" audio listening, trim ampli output at normal-low level.... For "boom boom" audio listening, trim ampli output at more high level, and pray your subwoofer doesn't fire...

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