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The GM designation for the 5.7 liter, (350 cubic inch), TPI motor. This motor was used in other GM vehicles, but was used in the Corvette from 1985 t...
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-=Jeff=- Equipment help Headunit I got will not work
Master Guru
Bartlett, IL
573 Posts
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2007/12/20 0:00



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Well I got my system installed and turned it on the other night. The Eclipse CD8053 I have is picking up noise from somewhere. Not sure where, but when I install my Nak there is no noise. Ironically the Nak CD player is working fine now too.

So instead of fighting the clean the signal on the CD8053 i am going to reinstall the Nak only problem is the Nak does not have a built in 3-way crossover like the Eclipse.

here is the equipment I have to work with currently and my plan if I use what I have.

Here is my plan using the limited pieces I have. tell me if this makes sense:


Coustic XM3
Front HP 32-400 or HP 640-8000 12dB slope
Rear HP 32-400 12dB
Sub LP 32-400 18dB

Amps (Arc KS 300.4):
Front: HP or LP 55-550 12dB
Rear HP or LP 55-550 or 550-5500 12dB

Amp 1 has tweets and 4s Amp 2 has 6.5 and Eu700s

My plan:
XM3 front (HP range of 3000Hz ) to Amp 1 front Tweeters
XM3 rear HP somewhere around 300Hz to Amp 1 rear (LP range of 3000Hz ) to 4s

XM3 Sub LP ~300Hz to Amp2 HP 100Hz to 6.5s
Amp 2 LP 100Hz to EU700s (no XM3)

That should get me all the right frequencies, only thing bothersome is the 18db cutoff on the midbass, but I think it will be fine

Another friend suggested I get the MiniDSP http://www.minidsp.com I would get the 2x4 (I would need 2) plus a plugin and shipping.. close to $300 for all I think

Looking for other thoughts and suggestions
Posted on: 2011/3/31 14:02
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-=Jeff=-
1990 Corvette ZR-1 #1051
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-=Jeff=- Re: Equipment help Headunit I got will not work
Master Guru
Bartlett, IL
573 Posts
Member since:
2007/12/20 0:00



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Will I am going to reinstall the Passives and run it that way for now and see how that works
Posted on: 2011/4/2 2:19
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-=Jeff=-
1990 Corvette ZR-1 #1051
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Matatk Re: Equipment help Headunit I got will not work
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SW Chicago Burbs
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Sorry, Jeff, that's out of my league. I'm no help there.
Posted on: 2011/4/2 11:35
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1989 Corvette...RIP
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-=Jeff=- Re: Equipment help Headunit I got will not work
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Bartlett, IL
573 Posts
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no worries, for now I will be running passives.. the MiniDSP is nice, but going to hold off for now
Posted on: 2011/4/2 14:45
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1990 Corvette ZR-1 #1051
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bogus Re: Equipment help Headunit I got will not work
Grand Imperial Pooh-Bah
San Pedro, CA
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I read this late the other night... promised myself I would reread... and forgot... sorry.

I will reread today and comment!
Posted on: 2011/4/2 15:21
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Education is the best tool to overcome irrational fear. - me

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-=Jeff=- Re: Equipment help Headunit I got will not work
Master Guru
Bartlett, IL
573 Posts
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Well, I installed the Passives.. sounds okay.. Going to revisit the Active later.. Might even revisit the Eclipse to see if i can work the issues out..
Posted on: 2011/4/4 1:32
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-=Jeff=-
1990 Corvette ZR-1 #1051
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-=Jeff=- Re: Equipment help Headunit I got will not work
Master Guru
Bartlett, IL
573 Posts
Member since:
2007/12/20 0:00



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Quote:

bogus wrote:
I read this late the other night... promised myself I would reread... and forgot... sorry.

I will reread today and comment!


so what do you think of the Active thoughts?

I am not happy with the passives after hearing the Active set-up

I will get by with it this year, but have some ideas for redoing the map layout in the back so I want to plan for an active set-up. if I wait until Winter i might just do the MiniDSP with an isolated DC power supply (to help with noise)

but still would like some thoughts if I used the equipment I have
Posted on: 2011/5/9 16:02
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-=Jeff=-
1990 Corvette ZR-1 #1051
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bogus Re: Equipment help Headunit I got will not work
Grand Imperial Pooh-Bah
San Pedro, CA
20856 Posts
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What kind of noise were you getting? If the head, like the eclipse is delivering 8 volts to the active crossover, then the xover should be a non-issue.

I had a Digital Research (?) or Coustic active xover a few years back. It sorta helped, but in all honesty, it created its fair share of noise, too.

I would play with gains and see what happens. If the active xover has an option for balanced signal, I would consider getting the converter. Also, Pheonix amps ppl used to make voltage line driver boosters for the RCAs. Up to 18v. I used one in an older Honda Accord (well, it was new to me in 1991!). That thing had brake light pop and could never find a better way to wire it. IIRC, the battery was on the right front, and no matter what I did, I was going to pick up engine noise. So I added the RCA line booster and that killed all noise and did wonders for the amps.

I assume your battery leads are running down the left side rocker, and RCAs are running down the right side of the trans tunnel? If found that the best solution for them.

A strange as it sounds, I haven't had noise issues with the C4.
Posted on: 2011/5/9 16:15
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Education is the best tool to overcome irrational fear. - me

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-=Jeff=- Re: Equipment help Headunit I got will not work
Master Guru
Bartlett, IL
573 Posts
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Yes power on left, RCAs on right

with the NAK I get NO noise. With the Eclipse I forget the noises I had, but they werer worse with key on then with it turned back in ACC. I need to try it again but will hook up power to the eclipse differently.

The Eclipse is a nice unit, but has a hissing (high noise floor) which I have seen mentioned by others.

I thought of using the XM3 with the NAK to go active and sell the Eclipse, which I might still do. another thought it going with the MiniDSP to run active as it would set-up all the crossover points.

I have some other ideas for the cargo area now that I have 2 amps. I had a chance to get 2 ARC mini's 125x4 but decided to keep the 300.4s (slight more power) but the 125.4 might have been more flexible in mounting locations due to the smaller size
Posted on: 2011/5/9 16:23
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