Custom 12" L7 Box Questions

[Dan and Christy]

uhhh...

REAL good suggestion. If the MTX were dual-2-ohm or single-4-ohm, the two could be paralleled to a single mono amp. The digital amps are more efficient....

Is there any way to tell what the resistance is without pulling it out of the box?

[chpthril]

Alright, stay with me if can handle a few new questions.

The 350.4 is a 4 channel amp. I currently have 6 each 6 1/2's plus the seperate tweeters in the cabin as well as 2 each 8" mid-bass. Add to that the 4 each 6 1/2's on the tower. So, is the 350.4 enough for all those speakers?

I am not as concerned about powering up the tower with a ton of juice this year because I am working on new Wetsounds sometime next season.

As far as the MTX Thunder 7500, isn't the 400.1 matched up perfectly with each at 400 watts RMS?

If i'm reading this right, you have 12 speakers running of the 4chnl side of the 700.5

The 4chnl side of the 350.4 is very close to the output of the 4chnl side of the 700.5, so how ever your current set up is, it would pretty much not change. I think we need to know exactly what you have and how it's wired and to what. You are positive on the MTX 7500? and is it DVC or single, and what Ohm coil(s) is it?

700.5 = 70W RMS x 4 @ 4ohm / 85W RMS x 4 @ 2ohm

350.4 = 60W RMS x 4 @ 4ohm / 90W RMS x 4 @ 2ohm

[chpthril]

Is there any way to tell what the resistance is without pulling it out of the box?

Pull the leads off the amp and measure the leads with a DVOM. this may not tell us whether it's DVC or single, but will give us the impedance which is important in order to choose the correct amp

[chpthril]

Is there any way to tell what the resistance is without pulling it out of the box?

Ok, looking at the MTX specs, the Thunder7500-12 comes in a DVC 4ohm or a single 4ohm, so if you measure the impedance, you will get either 2ohm (DVC 4ohm in parallel), 8ohm (DVC 4ohm in series) or 4ohm (single coil driver)

Both are a perfect match for the 700.5 class D chnl @ 420 watts.

[Dan and Christy]

If i'm reading this right, you have 12 speakers running of the 4chnl side of the 700.5

The 4chnl side of the 350.4 is very close to the output of the 4chnl side of the 700.5, so how ever your current set up is, it would pretty much not change. I think we need to know exactly what you have and how it's wired and to what. You are positive on the MTX 7500? and is it DVC or single, and what Ohm coil(s) is it?

700.5 = 70W RMS x 4 @ 4ohm / 85W RMS x 4 @ 2ohm

350.4 = 60W RMS x 4 @ 4ohm / 90W RMS x 4 @ 2ohm

Maybe that's why Larry said he "could not hear the speakers" this weekend

I will climb around the boat tonight and try to put a diagram together of everything.

It sure will be nice to get this all sorted out and taken care of correctly before I even touch the ballast this winter.

[philwsailz]

Alright, stay with me if can handle a few new questions.

The 350.4 is a 4 channel amp. I currently have 6 each 6 1/2's plus the seperate tweeters in the cabin as well as 2 each 8" mid-bass. Add to that the 4 each 6 1/2's on the tower. So, is the 350.4 enough for all those speakers?

I am not as concerned about powering up the tower with a ton of juice this year because I am working on new Wetsounds sometime next season.

As far as the MTX Thunder 7500, isn't the 400.1 matched up perfectly with each at 400 watts RMS?

That is too many speakers for the 350.4 The 6 6's and their tweets are fine. In my opinion the 8's are not really necessary, and you need a separate amplifier for the tower speakers. IF you want to keep the 8's I might parallel them to the half of the amp that only has a single pair of 6's on it, but at that point the amp is really over loaded, (in my humble opinion).

[chpthril]

Ok, this brings me back to a post yesterday. You have a sub that will sound very nice getting it's needed 400W's RMS (maybe only getting 210 depending on the subs impedance) and a sub that will absolutely pound when receiving it's needed 750W's RMS.

Would the Kicker L7 just not drown out the MTX? As I stated, like blue on black!

[Dan and Christy]

I've got you Mike. So if the L7 is going to just completely drown it out, I might as well remove the 7500 and put the L7 in that location, right?

[Dan and Christy]

That is too many speakers for the 350.4 The 6 6's and their tweets are fine. In my opinion the 8's are not really necessary, and you need a separate amplifier for the tower speakers. IF you want to keep the 8's I might parallel them to the half of the amp that only has a single pair of 6's on it, but at that point the amp is really over loaded, (in my humble opinion).

So...new amps all around huh?

I might as well keep the 8's seeing as they are currently in place and gaping holes in the boat don't look too pretty.

[philwsailz]

Ok, this brings me back to a post yesterday. You have a sub that will sound very nice getting it's needed 400W's RMS (maybe only getting 210 depending on the subs impedance) and a sub that will absolutely pound when receiving it's needed 750W's RMS.

Would the Kicker L7 just not drown out the MTX? As I stated, like blue on black!

It might add, or it might not.


There is that potential for, (depending on frequency) the two woofers to be fighting each other and cancelling each other out, due to being out-of-phase.

It will be a simpler system with a single monster woofer, and that REMOVES the potential for phase cancellation, (electrical, enclosure-induced, placement-induced, or otherwise).

I like going with teh silgle S12L7. Sell the MTX to help pay for the other goodies, like a tower amp maybe...

[philwsailz]

So...new amps all around huh?

I might as well keep the 8's seeing as they are currently in place and gaping holes in the boat don't look too pretty.

Sure!

two 350-4's for the full range speakers and the 8's. That gives you a one-speaker-per-amp-channel setup, (ideal in my opinion).

One more 350. for the tower (another speaker per channel situation)

A 750.1 for the sub, (if you can get the dual 4-ohm version)

This is but one possible scenario...
Mike?

[Dan and Christy]

It might add, or it might not.


There is that potential for, (depending on frequency) the two woofers to be fighting each other and cancelling each other out, due to being out-of-phase.

It will be a simpler system with a single monster woofer, and that REMOVES the potential for phase cancellation, (electrical, enclosure-induced, placement-induced, or otherwise).

I like going with teh silgle S12L7. Sell the MTX to help pay for the other goodies, like a tower amp maybe...

You guys are helping me in more ways than you know. By replacing the MTX with the L7, I don't have to lose storage space that Christy was seriously concerned about when we put the ballast system in this winter. Thanks for the points

[evil0ne]

So...new amps all around huh?

I might as well keep the 8's seeing as they are currently in place and gaping holes in the boat don't look too pretty.

If you're going to be doing all new amps the digital Alpine's have been doing great for a lot of boat setups and are super cheap on eBay.

[Dan and Christy]

Sure!

two 350-4's for the full range speakers and the 8's. That gives you a one-speaker-per-amp-channel setup, (ideal in my opinion).

One more 350. for the tower (another speaker per channel situation)

A 750.1 for the sub, (if you can get the dual 4-ohm version)

This is but one possible scenario...
Mike?

WOW, I never thought about having 4 amps in a boat. Sounds good though

[Dan and Christy]

If you're going to be doing all new amps the digital Alpine's have been doing great for a lot of boat setups and are super cheap on eBay.

Would you happen to have the model #'s?

Phil, what do you think about this?