Sanity check - designing my speaker to be 8ohm amplifier friendly.

owdi · 30th October 2005, 07:52 PM

I'm designing an MTM speaker using a pair of VIFA TC14SG49-08 5-1/2". I want the setup to be as efficient as possible, without presenting a difficult load to my receiver, which is only rated for 8 ohm speakers.

I want to wire these to speakers in parallel, and use a 3rd order filter at 2000hz along with a impedance compensation circuit. The problem with that configuration is the impedance will be very low, below 4 ohms I believe.

My idea is to not use the impedance compenstation circuit. This would give me a shallower rolloff, and require the use of larger inductors. If I use a small guage, the larger inductors should increase the overall impedance to something above 5 ohms (hopefully). Any thoughs?

I'd hate to pad down the woofer since that works against my objective of efficient speakers.

Dan

GM · 30th October 2005, 10:44 PM

Well, in the good ol' days we used autoformers........... http://www.zeroimpedance.com/

GM

owdi · 31st October 2005, 08:57 PM

Quote:

Originally posted by GM
Well, in the good ol' days we used autoformers........... http://www.zeroimpedance.com/

GM

Looks interesting. At $450, it would be cheaper for me to simply buy 4 more Vifa speakers. Hmm... bipole MTM... yum.

Dan

owdi · 1st November 2005, 09:53 PM

Problem solved -- looks like madisound carries a 4ohm version of this driver.

Dan

VT67 · 1st November 2005, 10:08 PM

Quote:

http://www.zeroimpedance.com/

Can't these things not be DIY'ed??

30th October 2005, 07:52 PM	#1
owdi diyAudio Member Join Date: Sep 2003 Location: Bellevue, WA	Sanity check - designing my speaker to be 8ohm amplifier friendly. I'm designing an MTM speaker using a pair of VIFA TC14SG49-08 5-1/2". I want the setup to be as efficient as possible, without presenting a difficult load to my receiver, which is only rated for 8 ohm speakers. I want to wire these to speakers in parallel, and use a 3rd order filter at 2000hz along with a impedance compensation circuit. The problem with that configuration is the impedance will be very low, below 4 ohms I believe. My idea is to not use the impedance compenstation circuit. This would give me a shallower rolloff, and require the use of larger inductors. If I use a small guage, the larger inductors should increase the overall impedance to something above 5 ohms (hopefully). Any thoughs? I'd hate to pad down the woofer since that works against my objective of efficient speakers. Dan

30th October 2005, 10:44 PM	#2
GM diyAudio Member Join Date: Jun 2003 Location: Chamblee, Ga.	Well, in the good ol' days we used autoformers........... http://www.zeroimpedance.com/ GM __________________ Loud is Beautiful if it's Clean! As always though, the usual disclaimers apply to this post's contents.

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1st November 2005, 09:53 PM	#4
owdi diyAudio Member Join Date: Sep 2003 Location: Bellevue, WA	Problem solved -- looks like madisound carries a 4ohm version of this driver. Dan