wondering two things

Scarrell · Post by **Scarrell** » Sat Apr 01, 2006 2:06 pm

ok.. im wanting to know if i can run some tweeters off my HU, it has a two way crossover

High-Pass Crossover (HPF) 50/80/125Hz, -12dB/Oct.

what are the pros and cons of this.. also

i found an old Alpine EQ in our storage building.. model number 3217

bi level 25+25
7 band graphic equalizer/amplifier

goes from 45hz +12 and -12 to 16khz +12 and -12

anyone have any info on either thing?

Post by **GlassWolf** » Sat Apr 01, 2006 2:16 pm

you could run the tweeters from the HU but you're better off putting them with the rest of your front stage for power so they're evenly powered.

the alpine is old. it's an eq/booster. it's ok, but nothing special. may have been great 20 years ago

Scarrell · Post by **Scarrell** » Sat Apr 01, 2006 10:58 pm

ok so i hooked the tweeters up to a HU in one of our cars.. (very low model, crappy Durabrand HU my dad bought) and they sounded fine, i mean no distortion until high volumes, but im sure on mine they will sound alot better.. anyway i am going to be putting them in tomorrow.. also i dont know if im going to hook up the EQ.. its only a 7 band.. and i have been informed that it may not even make much of a difference.. plus ive never hooked one up and im confused on how too, and i dunno if this one is the same as the new ones(installation wise).. also can Anyone find any info on this EQ?

edit: ok i did some searchin, didnt find anything new, but in my above post, i said this eq is also an amp, does like 25w+25.. so i was wondering i couldnt just power the tweeters off this also? and do i just run the RCA's from it to the HU and then ground it and run a power wire like an amp, and yeah..

Scarrell · Post by **Scarrell** » Sun Apr 02, 2006 12:50 am

ok, lol... i was in my attic and found Another EQ.. this time an Audiovox AMP 772 10 band graphic eq/amp... its 20+20.. and is pretty straight forward.. just needs ran to the battery and grounded.. no rca's or nothin.. and im not sure how to hook up the other so im going to try this one.. (god my dad or oldest brother bought some ghetto stuff..)

MobileAudio219 · Post by **MobileAudio219** » Sun Apr 02, 2006 10:08 am

I just keep whatever you have now until you can afford a small 2 channel and a decent set of comps... Look on ebay and I bet you could put together an ok front stage for probably around $200.00....

Scarrell · Post by **Scarrell** » Sun Apr 02, 2006 10:24 am

ill eventually put a 4 channel amp in there and get some comps for fronts and maybe just power the speakers in the back or ill get some midbass', i wont do anything ghetto for long, lol

Scarrell · Post by **Scarrell** » Sun Apr 02, 2006 2:30 pm

ok well i hooked that Audiovox eq/amp up.. it works.. but when i hooked the tweeters up to it, they got Really hot.. so i took the eq out and just hooked them up to the fronts, and they sound pretty good.. it brought my front stage up alot..

geolemon · Post by **geolemon** » Mon Apr 03, 2006 5:59 pm

Tweeters need higher crossover points.
The HU can cross it over at 250hz? It really needs to be filtered more like 2500hz... or higher even.

Excursion is the issue - the lower you ask a speaker to play, the greater the excursion it naturally reaches (a function of the slower "cycles per second" of the lower frequencies).

And tweeters are pretty fragile - you don't want to find out what happens if you "overexcurt" your tweets.

You can build simple crossovers using non-polarized capacitors, and for cheap - but it's only a 6dB/octave slope - so I'd shoot more for a 5000hz frequency or so with such a shallow slope.