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Old 10-10-2013, 08:10 AM - Thread Starter
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I've read multiple times how being in a small room can help a sub reach lower levels than it normally could. How much lower does it help extend? And why? Say a sub is rated to go to 35 in a small room what would it go to?

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Old 10-10-2013, 08:18 AM
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depends on the size of the room and type of subwoofer. A ported subwoofer rated +/-3db down to 35hz probably will not get any deeper because room gain normally does not start kicking in until 30hz and lower. . a sealed sub with a +/-3db down to 35 hz might extend to 25hz. Take note this is just a generalization, all depends on room dimensions.
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Old 10-10-2013, 08:23 AM
 
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basshead81 got here first.....what he said.

My reply below:

No telling as it's going depend on the output capabilities of the subwoofer, the size of the small room, sound wave interaction with a room's acoustics and how this will impact measurements at the main listening position.

(forgive me for leaving any pertinent factors out of my above)

It really isn't allowing the sub to dig deeper. What's happening, it's making what the sub has to offer, more noticeable by raising the SPL at lower frequencies. A sort of free lunch if you will known as cabin gain.

If working with a subwoofer who's specification are 35Hz, my recommendation would be to upgrade the subwoofer as opposed to hoping to get more out it by placing it in a small sealed room.

What subwoofer are you working with?
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Old 10-10-2013, 08:31 AM - Thread Starter
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ive just been researching and looking around. Thinking about getting two new matching subs for less each instead of one and then pairing it with the small klipsch i have now. my room is 1000 cubic feet or so. just thought i could get away with it. the sub i have now is ported and only reaches 40 lol

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Old 10-10-2013, 08:35 AM
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What I've heard is that it's all about the room's Schroeder Frequency, which is the frequency at which a room stops acting like a diffuser (reflecting sound waves in a more or less uniformly random pattern) and it starts acting like a resonator (in other words, the room starts acting like an extension of the cabinet, increasing the SPL.)

In a perfect sealed room, the Schroeder Frequency has a wavelength exactly twice the longest dimension of the room. So suppose you have a perfect sealed room that's 20x15x8, in such a room we could expect pressure vessel gain to start at about 28Hz.
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Old 10-10-2013, 08:35 AM
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General consensus seems to be go with the best single sub you can instead of 2 medicore subs.

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Old 10-10-2013, 08:44 AM
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A cool fact is that, assuming there's no weirdness in the room, the lower the frequency, the more gain is realized. So the combination of a very long, shallow rolloff (that you can get from a sealed sub) and a small room can result in very deep bass at high SPL.

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Old 10-10-2013, 09:23 AM - Thread Starter
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so a sealed sub would be best for small rooms? or no?

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Old 10-10-2013, 09:35 AM
 
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The basic rule is, sealed sub for a small sealed room and vented for large, open to other space rooms.

Do you have a budget in mind?
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Old 10-10-2013, 09:36 AM
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Quote:
Originally Posted by Brad Sutliff View Post

so a sealed sub would be best for small rooms? or no?
Yes!

Once again, I am sorry to take a sledgehammer to so small and fragile a nut. -- Richard Dawkins, The Greatest Show On Earth
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Old 10-10-2013, 09:43 AM
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Quote:
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so a sealed sub would be best for small rooms? or no?

Yes.... something like a SVS SB12NSD or PSA XS15 would kick ass in that small room!
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Old 10-10-2013, 10:29 AM - Thread Starter
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my budget is around 200.. lol

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Old 10-10-2013, 10:42 AM
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Is it burning a hole in your pocket? I mean, is there any way you could just save up? I say this because an SB12-NSD or XS15 could really dazzle you in that room. Is it sealed?

Once again, I am sorry to take a sledgehammer to so small and fragile a nut. -- Richard Dawkins, The Greatest Show On Earth
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Old 10-10-2013, 10:44 AM - Thread Starter
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The room has a window. Its usually covered by thick drapes. does that count as sealed?

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Old 10-10-2013, 10:47 AM - Thread Starter
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Also, i could save up. but ive got the upgrade bug, and my sub is really lame, came with my original HD300 package from klipsch, goes down to 40hz and is a ported 6.5inch lol

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Old 10-10-2013, 12:10 PM
 
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Quote:
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Also, i could save up. but ive got the upgrade bug, and my sub is really lame, came with my original HD300 package from klipsch, goes down to 40hz and is a ported 6.5inch lol

Have you looked through the two budget subwoofer threads that are currently running?

"Budget subwoofers discussions, opinions and questions thread"

"List of budget subwoofers ($300 and less)"
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Old 10-10-2013, 12:26 PM
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Yes.... something like a SVS SB12NSD or PSA XS15 would kick ass in that small room!

+1 - Just got my SVS SB12-NSD subs and I love them. In-room sub response not only depends on the room, but sub placement. In the corner or against a wall will reinforce bass frequencies but also usually causes poor bass response some places in the room where the bass cancels itself out. Measuring in-room response or the "sub crawl" will help you get the best location for the sub.

I really only needed one sub, but I have very limited placement options. Multiple subs isn't as much for louder bass as it is for more even bass response in the room. I had a Velodyne bass EQ that I used with my old sub - it allowed me to position it better and to cut certain frequencies that were reinforcing too much. I just bought a used SVS AS-EQ1 and will be using its dual sub Audyssey EQ to optimize their in-room performance for 2 subs - wish me luck.

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Old 10-10-2013, 12:27 PM - Thread Starter
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yes. i have been thinking about the Bic F12, which is ported

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Old 10-10-2013, 12:38 PM
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Quote:
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yes. i have been thinking about the Bic F12, which is ported

For $200 at Amazon I would choose this:

http://www.amazon.com/JBL-ES250PBK-High-Performance-12-Inch-Subwoofer/dp/B00166ZFSO/ref=sr_1_2?ie=UTF8&qid=1381429903&sr=8-2&keywords=jbl+subwoofer+12
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Old 10-10-2013, 12:41 PM - Thread Starter
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Thanks for the link! sub looks like a great option
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Old 10-10-2013, 12:52 PM
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Thanks for the link! sub looks like a great option

Free shipping is the icing on the cake...
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Old 10-10-2013, 12:58 PM
 
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Not knocking the JBL recommendation, for a few dollars more, my understanding, in this price point, this is the reining, available, Top Dog; the NXG Technology NX-BAS-500.

Home Theater Shack review

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Old 10-10-2013, 01:30 PM
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Thanks for the link! sub looks like a great option

I had one of those JBL ES250's, great sub for the money.
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Old 10-10-2013, 02:03 PM - Thread Starter
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Probably going to get it! Thanks guys. Also is there any positives from having one sealed and one ported? Do they cancel each others "positives" out?

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Old 10-10-2013, 02:49 PM
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Not quite like canceling each other's positives, it's more that they have different handling characteristics, and this may make them hard to integrate.

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Old 10-10-2013, 02:58 PM
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Probably going to get it! Thanks guys. Also is there any positives from having one sealed and one ported? Do they cancel each others "positives" out?

You may run into issues with cancellation around the ported subs tuning point. Can it be done... yes, is it recomended...no.
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