Probs w/ MTX...time to upgrade?

unrealii

I dont know if I understand what you guys are saying. I want to bi-amp (1 amp channel per speaker and no passive x-over) the fronts AND have amp power to the rears. I changed over to a bi-amp setup this morning. Before it was configured that front L&R amp channels were running through the crossovers feeding the tweeter and rear mid, while the front mids had an amp channel to themselves. If I use 2, 4, bridge 2, or even 5 channels of the mtx, I dont care. I just want my system how I have described it above.

It would take more effort on my part to sell the mtx than to wire it up in my car. I seriously thought this mtx would be fried inside and that good guys would be replacing capacitors, etc then I would definitly sell it. If its a few loose connections soldered up...then I am ready to put it back to work.

MacLeod

Bi-amping the front speakers you should still run thru the crossover. Either the passive unit that came with the speakers or an active unit. While the mid can run full range the tweeter can not, at least not for very long.

Bottom line is its your system and you do what you like as youre the one that is paying for it.

If you want to run both amps and bi-amp both front and rear speakers then go for it.

unrealii

Oops. Forgot to mention I am using the active x-over on the head unit Almost messed up yesterday and ran tweeters at full range

unrealii

Good news. I am almost done on my permanent install for the eclipse. I just have to recarpet my trunk floor now. Bad news, I ended up making a small but noticable crack in my plexiglass and the mtx is still broken after it was supposedly "fixed". Finally said f-it. I'm just going the run my system off of the eclipse bi-amped. Thanks for all of your help. I'll be posting pics in the custom install section showing my install.

exalted512

post a link when those pictures get up
-Cody

MacLeod

I think youll like it better this way. Simpler is better!

1996blackmax

Originally posted by unrealii
Good news. I am almost done on my permanent install for the eclipse. I just have to recarpet my trunk floor now. Bad news, I ended up making a small but noticable crack in my plexiglass and the mtx is still broken after it was supposedly "fixed". Finally said f-it. I'm just going the run my system off of the eclipse bi-amped. Thanks for all of your help. I'll be posting pics in the custom install section showing my install.

You should be able to get this setup to sound very nice with the HU's 3way setup. The ability to adjust the time delay for the tweeters and mids seperately will be cool
.

unrealii

Cody, here's your pics:
http://clubpolk.polkaudio.com/forum/showthread.php?s=&threadid=30119

Mac, I like it. Nice and simple:D

Black, Yeah, its good. Stupid eclipse mic has poor sensitivity, so it doesn't even pick up the sound during the measuing mode. I'll just use my ears and made the measurements myself.

unrealii

Finally got the amp back. It magically turned into an mtx 895. Looking at the invoice, looks like gg warranty paid $200 for the switch. I would have rather had the $200. Guess this is going on ebay...

1996blackmax

Well, at least you will get some money from it.

neomagus00

EDITED

yeah, i'm retarded...

unrealii

As I said on page 2 that this is far from the end, I've got an 85w x 4 amp on the way. Finally started tuning the system and the tweeters are far over powering the mids. I dont like seeing my volume on 60 out of 78, so its time to upgrade

Fronts will still be bi-amped. Now I'll have rears wired up to their own channel.

I have 2 4 channel amps now
4 x 85w
and 4 x50w (or 2 x130w) - thd is still very low in bridged mode, the front mids may be getting 130w, while rear mids and front tweeters receiving 85. We'll have to see what happens.

1996blackmax

Did you try lowering the levels on the tweeters? With the CD8454 you can adjust the time delay and the level of the tweeters, mids, and subs.

unrealii

yeah, i did. That made it sound infinitely better. But now with the amount of driving I do, I need a rear fill. Another reason is that road noise comes from all over the car, so I want a sound source behind me to cancel some out.

1996blackmax

Have you tried using some sound deadening material for the road noise. When I used Dynamat Extreme on my front doors it seemed to help that out some. I actually have a roll of the original stuff that a friend of mine gave to me. This weekend would be a great time to do the back doors . I think this will help quiet things down a little more, since the rear tires are right there next to the door.

I hear you on the rear fill, just make sure to attenuate it some. I use it to the point where I can't really tell that the rear speakers are on. If you are using the HU in pro mode it will let you drop off the rear speakers (as well as all other ones) by increments of 1dB's. I have my amp's rear gain lower than the front, but I still dropped the rear sound off by 11dB's.