selecting drivers

iceblueorbitz · 15th June 2006, 05:53 AM

i've actually got two questions.

#1. if i used two 75watt rms 8 ohm subs in parallel versus one 150watt rms 4 ohm sub, would there be any benifit? or just more money and hassle?

#2. if i use say a 150watt rms sub in a three way speaker, how would i know how powerful of a mid and tweeter to get so i don't blow them up while operating the speaker at the subs max volume. my amp outputs 2590watts rms at 4 ohm.

sreten · 15th June 2006, 01:58 PM

1) more expensive, but you can cancel 3rd harmonic distortion
and arrange the drivers for dynamic force cancelling.

2) 2.6KW ? The question depends on relative efficiencies.

/sreten.

preiter · 15th June 2006, 05:25 PM

Your amplifier puts out over 25 amps? How do you power that thing?

planet10 · 15th June 2006, 05:33 PM

Power has little to do with your question.

2 12" woofers push-push or push-pull with out perform 1 (the same). 2 cheaper 12s may or may not outperform a better 12"

dave

iceblueorbitz · 16th June 2006, 10:45 AM

i meant that my amp outputs 250W rms/channel at 4 ohm, not 2590 hahah. and i guess i'll just go with a single driver. we are looking at the RE subs from reaudio, but idk if they will work, because can you get their full power by only using one of the voice coils? and is their power handling half as much?

and about the midranges and tweeters, do most tell their handling in a 3way speaker? such as this...

Model PCM-85 Midrange open face closed back. Polymica cone, Rolled foam surround. Rated 60 watts direct RMS 150watts in system. 5.25" diameter (4-3/4" across mounting holes). Resp. 500 to 15KHz. Produces 96 db@ 1w/ 1m. 8 ohms. 12 oz. Magnet. Aluminum Voice coil.

15th June 2006, 05:33 PM	#4
planet10 frugal-phile(tm) diyAudio Moderator Join Date: Oct 2001 Location: Victoria, BC, NA, Sol III Blog Entries: 4	Power has little to do with your question. 2 12" woofers push-push or push-pull with out perform 1 (the same). 2 cheaper 12s may or may not outperform a better 12" dave __________________ community sites t-linespeakers.org, frugal-horn.com ........ commercial site planet10-HiFi p10-hifi forum here at diyA

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15th June 2006, 05:53 AM	#1
iceblueorbitz diyAudio Member Join Date: Jun 2006	selecting drivers i've actually got two questions. #1. if i used two 75watt rms 8 ohm subs in parallel versus one 150watt rms 4 ohm sub, would there be any benifit? or just more money and hassle? #2. if i use say a 150watt rms sub in a three way speaker, how would i know how powerful of a mid and tweeter to get so i don't blow them up while operating the speaker at the subs max volume. my amp outputs 2590watts rms at 4 ohm.

15th June 2006, 01:58 PM	#2
sreten diyAudio Member Join Date: Nov 2003 Location: Brighton UK	1) more expensive, but you can cancel 3rd harmonic distortion and arrange the drivers for dynamic force cancelling. 2) 2.6KW ? The question depends on relative efficiencies. /sreten.

15th June 2006, 05:25 PM	#3
preiter diyAudio Member Join Date: May 2006	Your amplifier puts out over 25 amps? How do you power that thing?

16th June 2006, 10:45 AM	#5
iceblueorbitz diyAudio Member Join Date: Jun 2006	i meant that my amp outputs 250W rms/channel at 4 ohm, not 2590 hahah. and i guess i'll just go with a single driver. we are looking at the RE subs from reaudio, but idk if they will work, because can you get their full power by only using one of the voice coils? and is their power handling half as much? and about the midranges and tweeters, do most tell their handling in a 3way speaker? such as this... Model PCM-85 Midrange open face closed back. Polymica cone, Rolled foam surround. Rated 60 watts direct RMS 150watts in system. 5.25" diameter (4-3/4" across mounting holes). Resp. 500 to 15KHz. Produces 96 db@ 1w/ 1m. 8 ohms. 12 oz. Magnet. Aluminum Voice coil.

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