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2 amps wiring


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toyota_4runner 
Copper - Posts: 60
Copper spacespace
Joined: March 31, 2004
Location: United States
Posted: May 03, 2004 at 2:07 PM / IP Logged  

I had a question of choosing between 2 amps ( one 4 channel and 2 sub channel) OR  one 6 channel amp. Well, from the replies it seems both will work for me and I am now trying to make the system economical. SInce I already have one 2 channel MTX thunder 275x amp,  I will look for a 4 channel amp (40 or 50 rms X4, suggestions, pm regarding used amp sale welcome)

Head Unit: Kenwood KDC-V7022 which has 2 amp preouts. NO sub preouts. One of the set of Rca says front and other rear. I have a simple question: How do I connect the two amps? Do I take one pair of RCA s into the MTX 275X for subwoofers and the other pair into the 4channel? Or does a 4 channel amp need to be connected to both pairs?

audiokid1 
Copper - Posts: 140
Copper spacespace
Joined: March 17, 2003
Location: United States
Posted: May 03, 2004 at 2:18 PM / IP Logged  
You can use y-adapters to connect the 4 channel to the front preout but you will not have fade front to rear capability with your mids and highs.  Or you may be able to use the pass thru outputs on the 4 channel (If it has them)  and run a pair of interconnects from that to the sub amplifier.
toyota_4runner 
Copper - Posts: 60
Copper spacespace
Joined: March 31, 2004
Location: United States
Posted: May 03, 2004 at 2:35 PM / IP Logged  
That also reminds me, one of the pair of RCA's says "no fade" on the RCA cable. Also can you suggest some 4 channel amps which have this feature (pass through outputs to connect to the sub amp)?
audiokid1 
Copper - Posts: 140
Copper spacespace
Joined: March 17, 2003
Location: United States
Posted: May 03, 2004 at 2:43 PM / IP Logged  
does the rca say no fade or non fading
toyota_4runner 
Copper - Posts: 60
Copper spacespace
Joined: March 31, 2004
Location: United States
Posted: May 03, 2004 at 3:43 PM / IP Logged  
oh yes non fading. sorry didn't write the right phrase. What does it mean? Its hard to believe it wont allow me to fade if I use an amp!
kgerry 
Platinum - Posts: 3,455
Platinum spaceThis member consistently provides reliable informationspace
Joined: February 07, 2004
Location: Saskatchewan, Canada
Posted: May 03, 2004 at 6:15 PM / IP Logged  

a non-fading pre-out is separate from the front and rear pre-outs...so that regardless of whether you fade all the way to the front or to the rear, you will still have full signal thru this set of pre-outs.... perfect for something like a sub application

and some amps do indeed have a slave preout to be used with a second sub amp...i cant think of any specific brand off the top of my head...but shop around and you'll find them

Kevin Gerry
Certified Electronics Technician
MECP First Class Installer
Owner/Installer
Classic Car Audio
since 1979
toyota_4runner 
Copper - Posts: 60
Copper spacespace
Joined: March 31, 2004
Location: United States
Posted: May 05, 2004 at 10:14 AM / IP Logged  
I rechecked the outputs on my KDC-V7022 ( you can see the wiring on page 40 of manual (same manual for KDC-MP822) on this website:
http://www.kenwoodusa.com/support/manual.jsp?divisionId=3&productid=2500
So I have only one preout (front) and one non fading preout. But I dont want to use the Y adapters as audiokid suggested since I would like to have control for fading.
My question is Can I directly connect the F and R speaker wires from the harness into the amplifier? (aren't they call "Hi-Level" connections on the amplifier?)
I was reading a manual on an amp and it said you shd connect RCA if available and if not use hi-level. Whats wrong or bad about using the speaker connections directly?
Thanks again
toyota_4runner
DYohn 
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Moderator spaceThis member has made a donation to the12volt.com. Click here for more info.spaceThis member has been recognized as an authority in Electrical Theory. Click here for more info.spaceThis member has been recognized as an authority in Mobile Audio and Video. Click here for more info.spacespace
Joined: April 22, 2003
Location: Arizona, United States
Posted: May 05, 2004 at 10:49 AM / IP Logged  

Yes, you can use the speaker level outputs from your head to drive the high-level inputs of your amplifier.  The only problem with doing this is the signal tends to be noisier and setting input gain is harder.  In general, a "non-fading" pre-out is designed for use with a subwoofer amp.

Another option to consider if you need more pre-amp level outputs than your head provides is to use a good crossover or EQ or line driver unit like an Audio Control Three.1.  This will allow you to split and amplify your single pre-amp out into several signals for amplifiers and give you some envelope modeling capability as well.

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toyota_4runner 
Copper - Posts: 60
Copper spacespace
Joined: March 31, 2004
Location: United States
Posted: May 05, 2004 at 2:27 PM / IP Logged  

I am posting the question again...

The salesman at tweeter really ripped me off by false information, firstly they said the KDC-V7022 played MP3s and it does not (someone here also said it played mp3 but it actually doesnot) and he also said it had 3 preamps and it has only 2! I bough it because it was a good deal (open box) and am in trouble now. Anyways now instead of spendin gmoney in trying to get extra preamps I guess I will connect only front speakers and the subs and connect the rear coax speakers directly through the HU.

ALso, I just bought the following (used) component speaker system for the front

MB Quart QM 215.03 CX Crossovers

MB Quart QTC 25 tweeters ( one website says it is 90W RMS)

MB Quart QM 130 speakers 5.25" (130mm) Midrange

My subs are 8 inch 8 ohm Rockford Fosgate which I d like to bridge to 4 ohms

My rear speakers are Boston Rally RM6 coaxials, Also now since the front speakers have higer RMS rating  and rear have less, it migh tbe a good idea to connect only the front to the amp. What do you guys think??

My options:

1. I am thinking of getting a 4 channel amp and using two channels for front components and one channel for the  subs bridged. OR, do they make 2 channel amps with extra channel for subs which will allow me to connect both front speakers and  the subs?

2. I have this MTX thunder 275X 2 channel amp which I was going to use for the subs. Now can I connect both speakers and the subs in parallel?

3. OR shd I get another 2 channel amp for the front and have TWO 2-channel amps one for the MB quarts and one for the subs?

Thanks again!

customsuburb 
Gold - Posts: 1,813
Gold spacespace
Joined: January 17, 2004
Location: United States
Posted: May 05, 2004 at 3:21 PM / IP Logged  

2 amps wiring -- posted image.

Above is a reccomened system diagram.

1. Use a good 4 channel amp for the front components and subs (like this Rockford Fosgate one).

2. No, I would use this amp for the boston acoustics speakers going in the rear.

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