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high impedance loads


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gandalf91 
Member - Posts: 35
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Joined: August 30, 2011
Location: Florida, United States
Posted: October 03, 2011 at 11:30 AM / IP Logged  
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.)
i am an idiot 
Platinum - Posts: 13,250
Platinum spaceThis member consistently provides reliable informationspace
Joined: September 21, 2006
Location: Louisiana, United States
Posted: October 03, 2011 at 2:41 PM / IP Logged  
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.
gandalf91 
Member - Posts: 35
Member spacespace
Joined: August 30, 2011
Location: Florida, United States
Posted: October 03, 2011 at 3:47 PM / IP Logged  
O_O ... Care to trade user names? -_-...lol
gandalf91 
Member - Posts: 35
Member spacespace
Joined: August 30, 2011
Location: Florida, United States
Posted: October 03, 2011 at 3:52 PM / IP Logged  
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.
oldspark 
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Joined: November 03, 2008
Location: Australia
Posted: October 03, 2011 at 6:01 PM / IP Logged  
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.)
gandalf91 
Member - Posts: 35
Member spacespace
Joined: August 30, 2011
Location: Florida, United States
Posted: October 04, 2011 at 1:39 AM / IP Logged  
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.
howie ll 
Pot Metal - Posts: 16,466
Pot Metal spacespace
Joined: January 09, 2007
Location: United Kingdom
Posted: October 24, 2011 at 5:54 PM / IP Logged  
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.

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