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high impedance loads

Printed From: the12volt.com
Forum Name: Miscellaneous - Off Topic
Forum Discription: Topics that just don't fit anywhere else.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=128713
Printed Date: March 28, 2024 at 10:52 AM


Topic: high impedance loads

Posted By: gandalf91
Subject: high impedance loads
Date Posted: October 03, 2011 at 11:30 AM

I'm sticking this one in off-topic since the pending application of this on my next project is not of a mobile nature.

Anyway, I understand running a load with too low an impedance into an amplifier can overheat it or even burn it up, but are there any drawbacks to running a higher than normal impedance load from an amp? My situation is basically that I'm looking to build a new 2.1 system for my PC, and have selected a subwoofer and a couple options for the woofers and tweeters. Anyway, the only drawback to the sub I chose is a really low sensitivity rating ~82.5 dB/w (4 ohms) vs the woofers I'm looking at ~86 dB/w (8 ohms). I have not definitively selected tweeters yet. However, if I choose 8 ohm tweeters and wire in series I'm looking at a 16-ohm load. The output levels of the speakers would be better matched prior to EQ'ing and fine tuning, but I am not experienced with running such an unusually high impedance. (Most amps I've seen give their specs rated a 4 ohms.)



Replies:

Posted By: i am an idiot
Date Posted: October 03, 2011 at 2:41 PM
You can not wire your tweeters in series with your midbass/woofer. The capacitor that needs to be in series with the tweeter is going to block the bass from the woofers.




Posted By: gandalf91
Date Posted: October 03, 2011 at 3:47 PM
O_O ... Care to trade user names? -_-...lol




Posted By: gandalf91
Date Posted: October 03, 2011 at 3:52 PM
After some consideration I will probably just go with 8-ohm drivers, 4 ohm loads anyway. For the same given voltage the speakers should align a little better sonically...I figure 82.5 db for the subwoofer with 83db for each of the other drivers at the same voltage. I still have twice as many satellites though, so I'll just have to feed the sub more power I guess. For its size, it seems to be capable of handling a pretty decent amount. It is the Tang Band W6 subwoofer, by the way.




Posted By: oldspark
Date Posted: October 03, 2011 at 6:01 PM
gandalf91 wrote:

O_O ... Care to trade user names? -_-...lol

Get away! You can queue after me! [ Though recently I thought something similar - maybe "not a complete idiot" - some parts are still missing! (That was someone else's signature - not their name. When I recover my pre-crash data I'll remember who.)]


And not that we all do it, but I certainly have my D'Oh moments - like that recent thread for a GPS to sense when the engine was running. Answer - when IGN is on. (I got fixated on the "engine running", hence alternator charge lights etc.)




Posted By: gandalf91
Date Posted: October 04, 2011 at 1:39 AM
Good to know I'm not the only one. On top of that, I really only got into this hobby several months ago. The only DIY audio project I have under my belt is my recent car stereo overhaul.

Anyway, since this may as well be a throwaway thread now, I have an unrelated question I can't seem to find the answer to searching around the web. Are there any good T/S parameters that do a fair job indicating whether or not a sub will have sufficiently quick transient response? I was thinking comparing different Vas ratings among the same sized speaker cones might make sense...since higher Vas per given cone size describes "stiffer" movement. Perhaps the acoustics all come out in the wash after it's housed in an enclosure though...I don't know. Correct me if I'm wrong.




Posted By: howie ll
Date Posted: October 24, 2011 at 5:54 PM
This is anal and unecessary, the results will be screwed up by differences in box sizes, crossovers amps etc.
Listen to it, if you like it, buy it.

-------------
Amateurs assume, don't test and have problems; pros test first. I am not a free install service.
Read the installation manual, do a search here or online for your vehicle wiring before posting.





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