Am I loosing my mind

shon35us · 25th September 2012, 04:25 PM

Hi, group. I'm having a blonde moment, I'm looking to build a full range speaker with 2 15" speakers, similar to GSM-3250, or Peavey PV 215 Dual 15" 2-Way Speaker Cabinet. If put power amp for 15" woofer separately I with get more out put correct.

amp 1 amp 2 amp 3
15" @ 200w + 15" @ 200w + 100w tweeter = 500w?

kevinkr · 25th September 2012, 05:04 PM

Commercially speaking they would be additive, technically speaking not exactly. Certainly you can claim 400W power to the woofers and 100W to the tweeter.

There's no particular reason IMO to use a separate amplifier for each woofer - I'd probably go with a 400 - 500W amp designed to drive the parallel impedance of your woofers, and I would probably choose 8 ohm woofers for this reason.

You will need to make sure that the tweeter can keep up with the woofers and with a 100W amplifier should be at least 6dB more efficient (assuming 400W woofer amp) than the combined efficiency of your woofers. Make sure that it can handle the required power around the cross-over point as it is likely to be working pretty hard at the low end of its response range.

Others will probably have a lot more insightful comments to add, mine are simplistic and probably just part of the story..

shon35us · 25th September 2012, 05:40 PM

Thank you!

I thought this was the case, FYI the rms value for the tweeter in question 175w, 250 watt max, but I don't see a need to drive that much high frequency output.

AuroraB · 25th September 2012, 06:09 PM

The wattage of your amp/speakers are of less concern than the sensitivity of the speakers...

The Woodworker · 25th September 2012, 08:14 PM

A question about speakers:
I would like to know if I can use a 60W house speaker with my car radio in my home.
No external amplifier. Just the one speaker. I presently am running a car speaker rated at 91dB, but it seems to run rather hot.
Thanks.

25th September 2012, 04:25 PM	#1
shon35us diyAudio Member Join Date: Oct 2005	Am I loosing my mind Hi, group. I'm having a blonde moment, I'm looking to build a full range speaker with 2 15" speakers, similar to GSM-3250, or Peavey PV 215 Dual 15" 2-Way Speaker Cabinet. If put power amp for 15" woofer separately I with get more out put correct. amp 1 amp 2 amp 3 15" @ 200w + 15" @ 200w + 100w tweeter = 500w?

25th September 2012, 05:04 PM	#2
kevinkr diyAudio Moderator Join Date: Sep 2004 Location: Boston, Massachusetts Blog Entries: 6	Commercially speaking they would be additive, technically speaking not exactly. Certainly you can claim 400W power to the woofers and 100W to the tweeter. There's no particular reason IMO to use a separate amplifier for each woofer - I'd probably go with a 400 - 500W amp designed to drive the parallel impedance of your woofers, and I would probably choose 8 ohm woofers for this reason. You will need to make sure that the tweeter can keep up with the woofers and with a 100W amplifier should be at least 6dB more efficient (assuming 400W woofer amp) than the combined efficiency of your woofers. Make sure that it can handle the required power around the cross-over point as it is likely to be working pretty hard at the low end of its response range. Others will probably have a lot more insightful comments to add, mine are simplistic and probably just part of the story.. __________________ "Extraordinary claims require extraordinary evidence." - Carl Sagan

25th September 2012, 06:09 PM	#4
AuroraB diyAudio Member Join Date: May 2001 Location: Norway, -north of the moral circle..	The wattage of your amp/speakers are of less concern than the sensitivity of the speakers... __________________ While the Lie leapt from Bagdad to Constantinopel, the Truth was still looking for it's sandals!

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25th September 2012, 05:40 PM	#3
shon35us diyAudio Member Join Date: Oct 2005	Thank you! I thought this was the case, FYI the rms value for the tweeter in question 175w, 250 watt max, but I don't see a need to drive that much high frequency output.

25th September 2012, 08:14 PM	#5
The Woodworker diyAudio Member Join Date: Sep 2012	A question about speakers: I would like to know if I can use a 60W house speaker with my car radio in my home. No external amplifier. Just the one speaker. I presently am running a car speaker rated at 91dB, but it seems to run rather hot. Thanks.

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