RE Audio XXX V2 15 Sealed enclosure Help - Car Audio Forumz - The #1 Car Audio Forum


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Old 02-05-2018, 03:17 PM   #1  
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RE Audio XXX V2 15 Sealed enclosure Help

Hello,
I have a decent working knowledge of audio installs but, I have a lot to learn. I’ve put together quite a few multi amp systems in cars and boats in the past 35 years. I owned a small home theater install business in Nashville for 5 years until the crash of 08 killed our business. I am building a new system in my boat and yes, I know this is a car audio forum.

I am all set with mids and highs and associated Amps.

My questions revolve around the Sealed Subwoofer Enclosure and which amp you guys recommend. Although it is in a boat it is dry stored and in an always dry compartment. Before I get blasted I understand “marine rated” gear etc..

The subwoofer specs are 15” dual 2 Ohm to run at 1 Ohm. RE specs the optimal sealed box at 2.1 ft3 and it just seems too small. I have read so many forums and posts including SMD regarding acoustic suspension and not to exceed Qms (3.62). But, the Vas is 207 L (7.31ft3), I have some space but not refrigerator size space. I have been leaning toward a 3.5 to 3.75 ft3 box as the sub displacement is .27 ft3 rated at 2000 watts. I have read about rolloff associated with a larger box, softer, less punchy bass and using Polyfill to reduce some wave issues and to trick the speaker. My brain hurts...

I prefer the sound of a sealed box over a ported box.

I like good hard bass and primarily listen to rock, country and occasionally a little rap ish music. I like it Low but I also want it loud and punchy. I do not have a PC to run Winisd or any of the other programs, only an iPad and a MacBook.

The space is vented into the cockpit area. It is a wakeboard boat and we rock pretty hard at times but, clearly it is not a competition setup like a lot of the systems you guys are running. We will rock pretty hard at times but usually it isn’t for an extended time.

It is getting an upgraded alternator, Big 3 and at least a third Group 27 Battery if not a fourth. It goes on a trickle charge after use.

So finally my first question is how big should I make the box for a good tight, punchy, hopefully reasonably low Bass?

Second part (sorry for the long post) I am trying to decide between 3 Amps.
Sundown SCV-3000 which has plenty of positive reviews.
Soundqubed 4500.1. Limited reviews
CT Sounds 4000.1 also limited reviews
I like the dual power and ground inputs on the last 2 amps. I ran dual 2/0 power and ground from the number 2 battery bank.

I have looked at a ton of Monoblock and these seem to be pretty good Amps and in the price range I am willing to spend, roughly $800.

I would really appreciate some Pro advice.

Last edited by Toddwilson; 02-05-2018 at 07:23 PM.
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Old 02-11-2018, 11:22 AM   #2  
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I must have done something wrong, my apologies. I know this was a long post and I have had no interest in any help.

Basically, if someone could just run numbers on a sealed enclosure for the xxx 15 V2 I would be very thankful.
RE states that the "optimum" enclosure is 2.1 ft3, their tech support is a bit under whelming.
The numbers I would like to see are for the recommended 2.1 size and then 2.5, 2.75 if someone is willing to help me out.
Fs 21.52Hz
Qms 6.401
Vas 3.837 cu ft
Xmax 2.3 in
Sd 128.6 sq in
Qes .38
Re 1.716 Ohms
Le 2.017 mH
Z 2.059 ohms
Pe 2000 Watts
Qts .3586

It depends on which cut sheet you look at as to the numbers they publish... who knows.
This is only my third box and I just want to do it correctly.
Thanks for reading!

Last edited by Toddwilson; 02-11-2018 at 11:44 AM.
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Old 02-13-2018, 03:09 AM   #3  
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or not....
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Old 02-15-2018, 08:32 AM   #4  
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Originally Posted by Toddwilson View Post
or not....
Sealed boxes are always smaller then ported. Would be nice if RE gave you a small and large recommended size. Worst case build one and try it...
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Old 02-15-2018, 08:37 AM   #5  
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Sealed boxes are always smaller then ported. Would be nice if RE gave you a small and large recommended size. Worst case build one and try it...
btw you can go on the 12volt website and use the box calculator if you need to run your numbers. Its not like the win one but it will help you with figuring your box size out.

https://www.the12volt.com/carau
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Old 02-15-2018, 03:16 PM   #6  
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Thank you, I have been using the 12volt calculator to design the box. I was only needing some F3 numbers on different sizes. I just wanted to make sure it didnít change much with different size sealed boxes. I was able to receive some help on a different forum.
Thank you for taking the time to try and help me!
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Old 02-15-2018, 03:17 PM   #7  
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BTW, RE gives compact and optimal size recommendations, I just didn’t trust they were correct.
Thanks again!
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Old 02-15-2018, 06:21 PM   #8  
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BTW, RE gives compact and optimal size recommendations, I just didnít trust they were correct.
Thanks again!
your welcome
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