MM455 & 465 - Amp questions...

[TBuz]

Need Help! I just bought a pair of MM455's and a pair of MM 465's from E-bay for my boat. I will also be adding a sub (not sure what sub yet).
I am thinking of running an Alpine 5-channel amp (30 RMSx4 + 100x1). Is that enough juice or should I consider a 2-channel (50x2) for the 455's and a 3-channel (75x2 + 150x1) for the 465's and sub?
Any help would be greatly appreciated!

[Kim]

TBuz,
For this application power is essential!! Use a amplifier that has a power rating of 85 to 150 Watts per channel to drive the MM455's and engage the high pass filter and set it to 90 Hertz. Set your low pass crossover to the same frequency and look for a amplifier that has a power rating of 200 to 300 Watts to drive your subs.

Thanks,
Kim

[TBuz]

Due to your suggestion, I am thinking about 2 JBL P180.2's for the MM455's and 465's. They put out 90/channel @4 ohms. Hopefully that will cover me! Is 90Hz a good high-pass setting for the MM465's as well as the 455's?

Also,
I just bought a JBL 600.1 (300 watts mono @4 ohms) for the sub. What Polk sub do you recommend with this amp? I only have room for a 10" sub in the boat.

Thanks!

[Kim]

Using a 90 Hertz high pass crosover frequency will work great with these speakers. The amplifiers will have plenty of power to drive them.

Regarding the subwoofer... do you have a space limitation that would force you in using a specific sized enclosure? With the power available from the sub amplifier I would suggest looking at the dx or the GNX series of subwoofers. The dx 10 requires a sealed box volume of .66 cubic feet. The GNX104 will work in sealed, ported, or bandpass enclosures. The MM100 requires more power to sufficiently drive them. We recommend driving them with a bridged power rating of 400 to 800 Watts

Thanks,
Kim

[TBuz]

Kim,

Thanks to your suggestions, I will be running 3 amps...
2 JBL @ 90 watts/channel: One each for the 455's and 465s
1 JBL 600.1 for the sub.
The JBL 600.1 amp will run 300 wattsx1 into 4 ohms or 600x1 at 2 ohms. It sounds like that should be plenty of power for even the MM100 or 120 (or maybe 2-10"s bridged).

The last thing I need is the sub(s). I have attached a couple of photos to show my space problem. I think I have room to mount a 12" sub directly into the fiberglass under the steering wheel (conveniently a Momo!). The problem is that the enclosed area behind there is pretty large. It would almost act like a "free-air" installation. Would I have to build some kind of box behind there, or will one of your woofers work OK in that application?

Other options: There is plenty of room under the closed-bow area up front, but I would be afraid of an echo-chamber effect.
The only other place I can think of is behind the rear bench seat, but as you can see, the padding behind there is pretty thick. Would 2-10"s behind the rear bench work better than a single 10" or 12" in the open under the steering wheel?

Any suggestions would be great... I can't wait to get this finished...It's lake time in Arizona!

Thanks for all your help,

TBuz

[Kim]

TBuz,
From your pictures it looks as if the back padded area of the back seats will be completely open and the area under the steering wheel is more enclosed than that of the rear of the boat. I would not recommend loading woofers in a area where there is no room boundary reinforcement. Granted cosmetically it may be more appealing but sonically I think that it will be a big disappointment.
Is there anyway to use a self contained woofer and listen to it in different locations before proceeding with the installation? This would give you a better idea on how these woofers will perform in this location before cutting anything.

Keep us posted!!
Kim