Newbie needs serious sub help

AcidRain · 7th March 2003, 04:23 AM

I have been reading through some DIY projects and thought I would try one myself. I have a very small budget so I figured I would use some speakers I have lying around the house since it would be my first project. When looking through my speakers I ran into a problem. I have heard that you cannot mix 4ohm with 8ohm speakers. Is this correct?
I would be using a Bose 2.75" tweeter(8 ohm), a Bose 6.5"mid/woofer(8 ohm), and a 12"SVC Cerwin Vega subwoofer(4 ohm). Is this a waste of time? Thanks for your help.

mikee12345 · 7th March 2003, 07:36 AM

theres nothing actualy bad about it.. that i know of.

aslong as the efficiency ratings are similar of the various speakers

and also as long as ur amp is 4ohm rated
not many ohms-too much current

ul probably find that the vega may be more efficient than the tweeter and mid.

:-)

Sch3mat1c · 7th March 2003, 07:40 AM

Um, lesse... if your amp is 8 ohms, then the two 8 ohm speakers in parallel, + the 4 ohm sub in series, will get a good impedance match.

In the real world, this probably won't work right, and something is telling me you'd need a capacitor across the sub (as opposed to a series inductor) to shunt higher frequencies away from it, and pour into the other speakers instead.

Tim

SkinnyBoy · 7th March 2003, 11:35 AM

Or you could bi-amp... one for the woofers, 1 for the mids and tweets.....

But, you said budget.. lol

AcidRain · 7th March 2003, 08:07 PM

There is no amp per say rightnow. The speakers will be playing straight through my receiver ( Technics SA-GX170 ). I beleive the rating on the receiver is 8 ohms. Does that mean that the sub will not play correctly?

7th March 2003, 04:23 AM	#1
AcidRain diyAudio Member Join Date: Mar 2003 Location: MidWest	Newbie needs serious sub help I have been reading through some DIY projects and thought I would try one myself. I have a very small budget so I figured I would use some speakers I have lying around the house since it would be my first project. When looking through my speakers I ran into a problem. I have heard that you cannot mix 4ohm with 8ohm speakers. Is this correct? I would be using a Bose 2.75" tweeter(8 ohm), a Bose 6.5"mid/woofer(8 ohm), and a 12"SVC Cerwin Vega subwoofer(4 ohm). Is this a waste of time? Thanks for your help.

7th March 2003, 07:36 AM	#2
mikee12345 diyAudio Member Join Date: Nov 2002 Location: NZ	ohms theres nothing actualy bad about it.. that i know of. aslong as the efficiency ratings are similar of the various speakers and also as long as ur amp is 4ohm rated not many ohms-too much current ul probably find that the vega may be more efficient than the tweeter and mid. :-)

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7th March 2003, 07:40 AM	#3
Sch3mat1c diyAudio Member Join Date: Jan 2003 Location: Milwaukee, WI	Um, lesse... if your amp is 8 ohms, then the two 8 ohm speakers in parallel, + the 4 ohm sub in series, will get a good impedance match. In the real world, this probably won't work right, and something is telling me you'd need a capacitor across the sub (as opposed to a series inductor) to shunt higher frequencies away from it, and pour into the other speakers instead. Tim

7th March 2003, 11:35 AM	#4
SkinnyBoy Banned Join Date: Nov 2002 Location: Adelaide, Australia	Or you could bi-amp... one for the woofers, 1 for the mids and tweets..... But, you said budget.. lol

7th March 2003, 08:07 PM	#5
AcidRain diyAudio Member Join Date: Mar 2003 Location: MidWest	There is no amp per say rightnow. The speakers will be playing straight through my receiver ( Technics SA-GX170 ). I beleive the rating on the receiver is 8 ohms. Does that mean that the sub will not play correctly?

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