Going to triamped in my car, how much power for tweeters? - diyAudio
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Old 25th February 2008, 04:06 PM   #1
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Default Going to triamped in my car, how much power for tweeters?

Right now I'm using a 4 channel amp, 2 channels for the sub, 2 channels for the mids and highs. I've got infinity 50cs components at the front (i think), with passive XO.

I plan to go fully active XO, here's rough overview on what I'm planning to do.

Sub = horn design with 2 x 8" drivers, each one getting 70Wrms.
Mids = 2 x 5.25" in the doors, each getting 70Wrms.
Tweets = They are 1" units, that's all I really know right now. I'm not sure how much power they will need to 'keep up' with the mids and sub.


I'm planning on going for tripath based amps all round, and I'm not really sure what amp to use for the tweets.

Would 25W rms per tweet be OK? Or could I get away with 15W? Or would it be best just to hook up and amp and see how well it works?
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Old 25th February 2008, 04:15 PM   #2
djQUAN is offline djQUAN  Philippines
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it will depend on the crossover frequencies you will use. you WILL use an active crossover, right?
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Old 25th February 2008, 04:47 PM   #3
y8s is offline y8s  United States
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you'll need to know the relative efficiency of the tweeters and mids.

if the mids are 87db @1W@1m (assuming 4 ohms for all drivers) and the tweeters are 90, you only need half the power of the mids.
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Old 25th February 2008, 06:23 PM   #4
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Quote:
Originally posted by djQUAN
it will depend on the crossover frequencies you will use. you WILL use an active crossover, right?
Yep, I'm planning on keeping the same crossover frequency as the passive crossover, but I'm going to use 24db/oct LR.

I'm not sure what the crossover frequency of the components are, but I thought be able to find out with a voltmeter and sig gen.
Quote:
Originally posted by y8s
you'll need to know the relative efficiency of the tweeters and mids.

if the mids are 87db @1W@1m (assuming 4 ohms for all drivers) and the tweeters are 90, you only need half the power of the mids.
All drivers are 4 ohm, but I haven't a clue about the efficiency... I'll have to dig up the specs... I've got the original box somewhere.

I thought that music often requires less power to the tweeters, even if the sensitivity of mids and tweeters are the same? Or is it normally a case of the tweeters being more sensitive?
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Old 25th February 2008, 06:46 PM   #5
jol50 is offline jol50  United States
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One would think so, but does not always work out that way. I have some 2x35 that will wang on mid/highs with no bass....other amps distort at the same spot no matter if they are pushing bass or not (bass in the mids not sub). I am not sure why, I suspect the topology of the amp. I like to run plenty large amps on highs (if they fit) just to be sure unless it is a known amp to me. For smaller music systems I have often run 300w amps on sub and high (2x75rms). I really want them clean and that is easy way....I'd say if you don't have experience with the particular amps you will have to find out what they do. Better quality small amps seem to be better at doing highs in my experience.
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Old 25th February 2008, 08:18 PM   #6
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I plan on using a 41Hz.com amp6 basic for the highs... It does seem good quality, but it doesn't clip gracefully.

I'll try wiring it up, and see how well it copes, but I may be better off sticking with my passive XO for now.
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Old 25th February 2008, 08:27 PM   #7
jol50 is offline jol50  United States
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Just put a cap on the tweeter with the active for some insurance.

I wish someone could explain it more. Bass certainly takes more power but I've had amps that will run tweeters very loud (& clean), and others that were larger that would not but would do bass better. Right now I have a kicker running highs and it will go to a certain point and clip. It does not matter if I have the subs on/off, or turn the HP up/down to vary the load on it. Last amp I had in there was a smaller wattage alpine that would go louder if the LP was higher, but broke up on the midbass if the HP was set lower.
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Old 25th February 2008, 09:20 PM   #8
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If you run too small an amp on the tweeters they will get a distorted signal from the amp when it goes into clipping earlier than the rest of the system and this is a sure fire way to blow your tweeters.
Years ago I ran a Rockford Fosgate Punch40dsm to a set of splits using the supplied crossovers, in this system I blew 2 tweeters, I then upped the system to 2 Punch40dsm's 1 bridged per channel giving 4 times the power and no more blown tweeters.
So go for the biggest that you can afford/fit.....
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Old 26th February 2008, 11:30 PM   #9
MartyM is offline MartyM  United States
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What kind of tripath-based amps are you using, out of curiousity?

I thought the only ones for car audio were the now-defunct T-class full-range amps by Blaupunkt some time ago.

I'm very curious.
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Old 27th February 2008, 12:19 AM   #10
ca90ss is offline ca90ss  United States
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Quote:
Originally posted by MartyM
What kind of tripath-based amps are you using, out of curiousity?

I thought the only ones for car audio were the now-defunct T-class full-range amps by Blaupunkt some time ago.

I'm very curious.

Arc Audio had a couple as well as Zapco, US Amps, Clarion, Alpine and Cerwin Vega to name a few.
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