questions on tweeters

calvin14 · 11-04-2009, 10:58 AM

hihi. i'm a noob trying to upgrade my car tweeters. i have a crossover network wired up already.

can i ask if any of you guys tried to fix some of these non-car tweeters in your car?
like this one:
http://www.parts-express.com/pe/show...number=279-140

they are alot cheaper. and seem for value for money than car tweeters.

thanks!

treetop777 · 11-04-2009, 09:08 PM

They will probably work but you got to look at (among other things) the impedance of the speaker as compared to what your amp or HU can handle.

I'm rusty on which impedance car speakers are (either 8 or 4) so you might want to find that out and compare it to this speaker.

bratnetwork · 11-04-2009, 09:13 PM

most car speakers are 4-ohm, some higher end ones are 2-ohm. 8-ohm is common for home speakers

nobb · 11-04-2009, 09:26 PM

Most car stuff is 4ohm, whereas the PE drivers are typicalls 6 - 8 ohm. If you know what you are doing, you can potentially piece together a system that will cost significantly less than a store-bought product. I built my own component speaker system from PE for ~$100 with some higher quality caps, inductors, dayton tweeters, and audax aerogel midbass. It's 6 ohms, but runs off my amp just fine. But if you are adding a tweeter to an already designed crossover network, then make sure the impedance matches otherwise your freq curve will change.

calvin14 · 11-05-2009, 06:10 AM

Quote: Originally Posted by nobb

Most car stuff is 4ohm, whereas the PE drivers are typicalls 6 - 8 ohm. If you know what you are doing, you can potentially piece together a system that will cost significantly less than a store-bought product. I built my own component speaker system from PE for ~$100 with some higher quality caps, inductors, dayton tweeters, and audax aerogel midbass. It's 6 ohms, but runs off my amp just fine. But if you are adding a tweeter to an already designed crossover network, then make sure the impedance matches otherwise your freq curve will change.

that's quite awesome!

soundman98 · 11-05-2009, 09:16 AM

that reminds me, i need some new mids....

alot of people have used large format tweeters like that. IMO, the largest hurdle to overcome is mounting it-- because they are just so big--once you get it mounted though, the change in resistance can be compensated for with different settings.

nobb · 11-05-2009, 09:25 AM

Yea most of the PE tweeters are huge. Take a look into the Dayton ND20FA tweeter, that's the one I use. I picked it because it's very small and you can mount it from the surface.

calvin14 · 11-05-2009, 09:44 AM

Quote: Originally Posted by nobb

Yea most of the PE tweeters are huge. Take a look into the Dayton ND20FA tweeter, that's the one I use. I picked it because it's very small and you can mount it from the surface.

that's very nice....but.
it's 6ohms. my crossover came with 4ohms. so what do i need to do?

ptcary · 11-10-2009, 07:40 PM

I run Selenium tweets and mids in my "monster PT" they are 8 ohms and very efficient, I run them off of a 4 channel amp 115 per side but less since the 115rms is 4 ohms, they get very loud!

I also run Dayton mids and Vifa tweets up front, but they are 4 ohms mdels.

8 ohms tweets are fine, as long as you keep the crossover point safe for them and watch the efficiency of them, usually pretty high.

calvin14 · 11-13-2009, 10:45 PM

Quote: Originally Posted by nobb

Yea most of the PE tweeters are huge. Take a look into the Dayton ND20FA tweeter, that's the one I use. I picked it because it's very small and you can mount it from the surface.

can i ask at what freq did you cross it over?

nobb · 11-13-2009, 10:50 PM

I dont remember exactly, but probably at around 4500hz. I did a 2nd order Linkwitz riley crossover design. I mainly chose this crossover point by eyeballing the frequency response graphcs for the tweeter and midrange. Also had to add some resistors to create a L-pad to attenuate the tweeter. Im happy with the results though, since I spent <$100 and my components sound better than all the <$250 systems Ive heard (atleast in my opinion).

Im curious as to how the "pros" would normally go about designing a crossover.

pulsarsimon · 11-14-2009, 05:46 PM

most car tweeters are 6 ohms anyway, so should be fine.

the main difference with most car tweeters is they are designed to work well off-axis, i.e. not pointing straight at you. home tweeters are usually designed to point right at you, and may not work best in a car environment. sometimes also the materials are not designed for the hot/humid car and may fail prematurely. They are a lot cheaper though.

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