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4ch Amp install, Kenwood MPV622 deck


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tazmool 
Member - Posts: 2
Member spacespace
Joined: May 19, 2004
Location: Canada
Posted: May 19, 2004 at 1:24 AM / IP Logged  
Howdy,
I have installed a Kenwood MPV622 deck into my 1991 Mercury Topaz looking for a little more sound.
I also installed:
Pioneer 6.5" 2-way (TS-G1640R) Fronts (160W-max 30W-rms)
Pioneer 6x8 4-way (TS-A6880R) Rears (240W-max 50W-rms)
I listen to some Rock, Alternative, Metal and all sorts of other music.
The current setup has nice mid & highs, but the low & bass is just weak. I'm not looking for thunder bass, just richer sound (my friends Factory '02 Sebring Infinity system sounds better than my setup now).
A buddy of mine suggested I should throw in an Amp to help bring out the sound as my Deck is probably way underpowered to move the 4 speakers.
The same buddy also gave me his old amp:
Precision Audio "Thump" 4-channel THA-4000 amp
4x75W (300W total)
0.05 THD
MOSFET
Class "A" Circuit
Connection wise the amp has:
4x RCA type Low-input connectors (chnnls 1-4)
4x Speaker out connectors (chnnls 1-4)
3x Power connectors (B+, Ground, Remote)
2x black knobs labeled power (chnnl 1&2 3&4 combined)
I need help on how to wire this puppy up to my Kenwood deck, (there is no manual for this amp, and I have never done this type of install b4).
I would appreciate some suggestions on how to do it (and make it sound good).
The amp also came with 2 "Omni Directional In-Line Noise De-Couplers" with RCA plugs (male & female) on the ends of the cables.... what do those do? do I need them?
I'll try to include the wiring diagram for my Deck in this post.
Any help would be appreciated.
Thx
Tazmool
4ch Amp install, Kenwood MPV622 deck  -- posted image.
stevdart 
Platinum - Posts: 5,816
Platinum spaceThis member has made a donation to the12volt.com. Click here for more info.spaceThis member has been recognized as an authority in Mobile Audio and Video. Click here for more info.spaceThis member consistently provides reliable informationspace
Joined: January 24, 2004
Location: Pennsylvania, United States
Posted: May 19, 2004 at 7:30 AM / IP Logged  

The front speakers are 30 RMS, the backs are 50 RMS.  The amp is 75 watts to each.  I wouldn't try this marriage

of equipment for a first-time install.  Best bet is to 1st upgrade the front speakers to 75 RMS, after that repost

without the large diagram.

Build the box so that it performs well in the worst case scenario and, in return, it will reward you at all times.
fuseblower 
Silver - Posts: 403
Silver spacespace
Joined: June 25, 2003
Location: United States
Posted: May 19, 2004 at 8:34 AM / IP Logged  

The amp should be real easy to install.  Just run your power wires and ground wire.  Don't foget to run your RCA wires also, it looks like your radio has 2 sets out RCA outputs.  Also you will need to run speaker wires from the amp to the speakers.  After that you will have to adjust your gains on your amp.  Be very careful when doing this because the amp just about double the RMS power that the speakers can hold.  I suggest setting the amp real conservative so that you wont blow your speakers and still have nice sound.

Also, you can add speaker baffles to your speakers and this would help to increase your bass response. 

tazmool 
Member - Posts: 2
Member spacespace
Joined: May 19, 2004
Location: Canada
Posted: May 19, 2004 at 4:00 PM / IP Logged  
Ok, I have decided to try the amp install and keep the gains down as not to blow the speakers.
I would not mind changing the fronts, but I'm really trying to keep this setup on the cheap, and all 4 speakers are brand new.
I am not 100% sure if the 300W on the amp is RMS or Max, but I'll try to keep it on the safe side.
The RCA outs on the Deck are Front & Rear only, non fading, does this mean that the fronts are now going to be mono? and the rears are mono? (ie no left & right pan)
The RCA out on the Deck has only 2 RCA cables, one for front & one for rear... the amp has 4 RCA plugs (chnnls 1-4)
Is there a way to hookup the speaker outs on the deck to the RCA ins on the Amp? and keep all 4 channels independant? and keep the sound good?
I know I should hookup the battery + terminal to the positive to the amp, but where should I hookup the ground? to the chassis? or a ground used on the deck itself?
Also, the remote wire on the amp, should I connect that to the power antenna wire on the deck? (as far as I know the deck does not have a remote amp turn on wire)
Thx Guys
Tazmool
stevdart 
Platinum - Posts: 5,816
Platinum spaceThis member has made a donation to the12volt.com. Click here for more info.spaceThis member has been recognized as an authority in Mobile Audio and Video. Click here for more info.spaceThis member consistently provides reliable informationspace
Joined: January 24, 2004
Location: Pennsylvania, United States
Posted: May 19, 2004 at 5:16 PM / IP Logged  

If you don't have at least one RCA output on the deck that is stereo, then you can use a quality line output converter like this to feed signal from the original speaker wires to the RCA inputs on the amp.  I brought your diagram up large again to look at it, but I can't tell if it has stereo outputs.

The amp ground wire should be less than 2 feet and same gauge as power wire, connected to metal chassis close to the amp.  Remove paint if necessary.

Yes, try connecting to that power antenna wire.  Other option is to run the amp remote to the fusebox and tap a 12 volt switched wire (the amp will be on when the car is on).

Build the box so that it performs well in the worst case scenario and, in return, it will reward you at all times.
Sweekster 
Silver - Posts: 481
Silver spacespace
Joined: May 13, 2003
Location: United States
Posted: May 19, 2004 at 6:28 PM / IP Logged  
Um, that particular model has front and rear RCA pre out (no need for a LOC). It also has a remote turn-on wire on it.
So my suggesttion is this. Get to good sets of RCA's(2 pair) or an amp install kitwith a second set of RCA cables and run those from the RCA out on the back of the radio down the passenger of the car and to the amp. Then run a wire from your remote turn wire (it should be the blue wire coming from the back of the radio) from the radio down the drivers side of the car to the remote turn on on the amp. Then run the power cable (with a fuse no more than about 12 inches from the battery) from the positive post on the battery down the drivers side of the car to the 12 volt (+) on the amp. Then run the ground cable from the (-) part on the amp no more than 2 or 3 feet in length from the amp to a good clean area on the car (scrape off the paint) and drill it down with a loop connector on the with a self tapping screw. Then run new speaker wire (16 gauge should be fine) from the amp to your speakers. If all the connections are done correctly, you should be able to turn your radio on and then adjust your amp's gain to get the bass you want and your speakers can cleanly put out.
Duane...
If you think you're confused, imagine how you feel.   4ch Amp install, Kenwood MPV622 deck  -- posted image.
Sweekster 
Silver - Posts: 481
Silver spacespace
Joined: May 13, 2003
Location: United States
Posted: May 19, 2004 at 6:30 PM / IP Logged  
Also... here is a link to the manual.
Duane...
If you think you're confused, imagine how you feel.   4ch Amp install, Kenwood MPV622 deck  -- posted image.

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