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6 Ch Amp with 8 Speakers


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gonzo532 
Member - Posts: 2
Member spacespace
Joined: March 16, 2006
Posted: March 29, 2006 at 1:39 PM / IP Logged  

Hello,  I am in need of some advice.

I am an average installer, I can build boxes , upgrade a car stereo etc etc.

Here's my project:

I havea box with  EIGHT 150Watt 6"x9" Kicker 3 Way Speakers.

I have a JL Audio Marine Amplifier Model# e6450M, Six Channel Amp.

What configuration should I use to connect 8 speakers to the 6 channels????

Here are the Amp spec's

Rated Power 12.5 V Stereo:45W RMS x 6 @ 4 ohm
75W RMS x 6 @ 2 ohm
Rated Power 12.5 V Bridged:90W RMS x 3 @ 8 ohm
150W RMS x 3 @ 4 ohm
Rated Power 14.5 V Stereo:70 W RMS x 6 @ 4 ohm
110 W RMS x 6 @ 2 ohm
Rated Power 14.5 V Bridged :140 W RMS x 3 @ 8 ohm
220 W RMS x 3 @ 4 ohm
THD at Rated Power:12.5V: <0.08% THD, 20 Hz - 20 kHz
14.4V: <1% THD, 20 Hz - 20 kHz
S/N Ratio:>104 dB referred to rated power (A-weighted, 20 Hz – 20 kHz noise bandwidth)
Frequency Response:10 Hz – 25 kHz (+0, -1dB)
Damping Factor:>200 @ 4 ohm per ch. / 50 Hz
>100 @ 2 ohm per ch. / 50 Hz
Slew Rate:± 22V / µs
Input Range:200mV – 8V RMS
Dimensions (L x W x H):17.70 in. x 9.25 in. x 2.36 in.
450 mm x 235 mm x 60 mm

DYohn 
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Joined: April 22, 2003
Location: Arizona, United States
Posted: March 29, 2006 at 4:00 PM / IP Logged  
First of all, why in the world would you want 8 3-way speakers in one box?  But sure, since you must not be too concerned about how it sounds anyway, assuming the speakers are each 4-ohms connect two sets in parallel to two channels and the other four speakers to the other four channels.
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forbidden 
Platinum - Posts: 5,353
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Joined: November 01, 2003
Location: Alberta, Canada
Posted: March 29, 2006 at 4:04 PM / IP Logged  

Use 4 channels of the amp only. Parallel wire each pair of 6x9's to 2 ohm and connect to the 4 channels of amplification. Leave the other 2 channels alone for future use. DYohn's method will work fine as well.

Top Secret, I can tell you but then my wife will kill me.
stevdart 
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Joined: January 24, 2004
Location: Pennsylvania, United States
Posted: March 30, 2006 at 12:20 AM / IP Logged  
Unscrew each one of them and frisbee them into the lake.  See how far you can sail them. You'll have eight tries.
Build the box so that it performs well in the worst case scenario and, in return, it will reward you at all times.
DYohn 
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Joined: April 22, 2003
Location: Arizona, United States
Posted: March 30, 2006 at 12:31 AM / IP Logged  
Velocity Motors 
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Joined: March 08, 2002
Location: Manitoba, Canada
Posted: March 30, 2006 at 8:42 AM / IP Logged  
lol 6 Ch Amp with 8 Speakers -- posted image...... That's why I keep coming back here. You guys are a peice of work. 6 Ch Amp with 8 Speakers -- posted image.
Jeff
Velocity Custom Home Theater
Mobile Audio/Video Specialist
Morden, Manitoba CANADA
gonzo532 
Member - Posts: 2
Member spacespace
Joined: March 16, 2006
Posted: March 30, 2006 at 10:10 AM / IP Logged  

LoL, I know it's a weird setup. There is a reason and here it is:

The system is going into a brand spankin' new MasterCraft X2 ($70,000) wakeboard boat.  The stock system comes wtih Four JL Audio Separates and One 10" Subwoofer all powered by a JL Audio Marine 4 CH Amp.  My friend (boat owner) wants it this way so here I am asking for help.

The Box is an aerodynamic plastic material and made for the boat tower. Yes, it's a little overkill for tower speakers but it looks really good on the boat.  In fact, the tower and 8 Kicker speakers only cost $600 vs. the box with four speakers for $400.  It was a good deal at the boat show and it was somewhat of a drunk purchase.

My concern is this:  If I run all these speakers on one amp on High Pass, Can I FRY the amp??  The amp has internal protection so I'd hope that would kick in before drawing too much off the amp.  My friend really likes to turn up the music when the boat is underway (wakeboarder thing).

I'll hook it up using six channels, two channels will get four speakers in parrallel....See Diagram to confirm I'm good to go please!

Thanks so much, you guys are a wealth of info.  Yes, you can laugh at my cheezy diagram.

6 Ch Amp with 8 Speakers -- posted image.

stevdart 
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Location: Pennsylvania, United States
Posted: March 30, 2006 at 10:29 AM / IP Logged  

Hmm, wonder how I knew you were on a lake?  And lol to "It was a good deal at the boat show and it was somewhat of a drunk purchase."  I can understand that!

You can't fry the amp as long as the impedance load per channel doesn't go below 2 ohms.  You could hook up as many of the same-ohm speakers as you wanted to, using various parallel / series connections.  The speakers don't "draw" off the amp, they just provide a resistance load that causes the amplifier to perform in a certain way, and then receive the output from the amp.  The wattage is divided into the number of speakers according to their combined impedances per each channel.

So, per your diagram (which is quite good I think ;) if all channels are equal, each speaker will receive the same amount of power (most good amplifiers would result like this).  Just two of the channels will be performing at a somewhat lower standard of quality (hotter) at 2 ohms, and the other four channels will be outputting at a cool 4 ohms.

Build the box so that it performs well in the worst case scenario and, in return, it will reward you at all times.

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