Series circuitry with passive crossovers
Printed From: the12volt.com
Forum Name: Car Audio
Forum Discription: Car Stereos, Amplifiers, Crossovers, Processors, Speakers, Subwoofers, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=26347
Printed Date: June 01, 2024 at 4:13 PM
Topic: Series circuitry with passive crossovers
Posted By: RawBidness
Subject: Series circuitry with passive crossovers
Date Posted: February 12, 2004 at 2:11 PM
Hey,
Does anyone know what happens to the passive crossover when you run two of the same speakers off of the output of the crossover? Does it make any sort of a difference? For example, if I run two tweeters in series off of the tweeter output on the passive crossover..
TIA,
RB
Replies:
Posted By: forbidden
Date Posted: February 12, 2004 at 2:27 PM
It throws the crossover point out the window, still usable, but not as precise, can't remember if it goes up or down in frequency.
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Top Secret, I can tell you but then my wife will kill me.
Posted By: RawBidness
Date Posted: February 12, 2004 at 2:29 PM
I would assume that it would go up, but I was making sure that I wouldn't overload the amplifier channel, Thanks for the reply,
TTT
Posted By: DYohn
Date Posted: February 12, 2004 at 2:40 PM
Two similar (same impedence) speakers wired in parallel to a passive Xover will DOUBLE the frequency X point since the impedence is cut in half. Two speakers wired in series will cut the X point in half. Yes, it is possible to overload the amplifier channel by changing the impedence load a passive cross is designed for. This would happen if you, for example, add a second woofer into the low pass section of a 2-way network but not to the high pass section. The low-pass X-point doubles, up from say 2400 Hz to 4800 Hz. Besides the fact that some woofers cannot accurately reproduct 4800 Hz, the high pass section will still function at the original point of 2400 Hz. Thus, between 2400 Hz and 4800 Hz all three speakers are connected in parallel to the amplifier. This could easily drop the net impedence load down too far and overload the amplifier. Not to mention the terrible sonic effects you will get. So I recomend that if you need to add speakers to a passive crossover filter network, redesign it for the new impedence loads and build a new one.
Posted By: RawBidness
Date Posted: February 12, 2004 at 2:49 PM
Thanks a lot you guys!! I have been waiting on some thorough answers on this subject, and haven't been able to get it.
Appreciate the time,
RB
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