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post #1 of 7 Old 11-05-2013, 06:42 AM - Thread Starter
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Hi

I have some experience with car audio boxes, but none on a home theater environment, i'm doing some upgrades to y HT system, currently i have a logitech z5500 sub in my system, that have serve my purpose for some time, but is time yo get serious now, and have a better sub.

I was thinking on purchasing a sub, but given that i'm outside USA shipping for a sub will be in the order of $100-150 more, and i can use that extra money to build something better.

I have a MB Quart RWE-352 sub, that i used on my car and is laying for a few years now, i was thinking on using that sub, that is 15", i was thinking on getting the Yung SD300 amp, that parts express have, is a 300W amp@4ohm, and the sub is dual 2ohm, so i s a good match.

I know how to build boxes, but i have no idea how to desing a HT box, this sub is recommended to be used on a 1.5 cu.ft sealed box from manufacturer, but i guess this box is for car environment, the room were the sub will be used is a small one 10x11.

The sub TS that are on the manual:

RE: 3.2
QMS: 6.37
QES: 0.531
QTS: 0.49
FS: 20
VAS: 157L
Size: 15"

What do you think about the AMP and what box should i use??
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post #2 of 7 Old 11-05-2013, 08:52 PM - Thread Starter
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No one??

I Build this box ASAP, help please.
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post #3 of 7 Old 11-05-2013, 09:19 PM
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Looking at that QTS and Vas, I'm guessing you're gonna end up with a ported box around 8-10 cubic feet tuned to 19-20 Hz. Someone would have to throw the numbers in to WinISD, but you don't have enough parameters to model it.

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post #4 of 7 Old 11-06-2013, 01:49 AM
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here is 6 cubic feet tuned to 20hz in 2pi space (no room gain).

obviously without knowing sd and xmax, we can't know how hard 300 watts will push it from an excursion point of view, but my guess is that it will work.

as for the port, that kind of depends if you want a slot port, round ports, or what. so if you have something in mind, we can work with, kick it out and let's see what we can cook up.


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post #5 of 7 Old 11-06-2013, 06:05 AM - Thread Starter
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Thanks, i'll prefer a slot port. Doing some research i found that xmax is suppose to be 8.9mm.

What about sealed box?? This is suppose to be better in those.
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post #6 of 7 Old 11-06-2013, 06:16 AM
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Quote:
Originally Posted by symon_say View Post

What about sealed box?? This is suppose to be better in those.
That depends on how you define 'better'. Drivers with Q of more than .4 tend to have flatter response in a sealed box, and a sealed box will be smaller. But low frequency extension, sensitivity and output will all suffer compared to vented.

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The Laws of Physics aren't swayed by opinion.
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post #7 of 7 Old 11-06-2013, 06:26 AM - Thread Starter
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Quote:
Originally Posted by Bill Fitzmaurice View Post

That depends on how you define 'better'. Drivers with Q of more than .4 tend to have flatter response in a sealed box, and a sealed box will be smaller. But low frequency extension, sensitivity and output will all suffer compared to vented.

I ask because the manual don't even recommend a ported box for this sub.

I use to have a bunch of subs, but now this is the only one left, and i'll like to use and don't spend any more on this, i'm sure that this sub on any box should sound better that the logitech sub.
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