Tuba 30" or twin SPUDs? - Page 4 - AVS Forum
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post #91 of 102 Old 09-02-2013, 07:59 AM
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I recall people saying not to mix the SPUD and THT together.
Mixing any different formats is a crapshoot, since the phase responses as well as frequency responses will be different. Like any experiment it may work well, or it may not.

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post #92 of 102 Old 09-02-2013, 11:33 AM - Thread Starter
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Thanks Bill.

Any opinion on the proposed location, with the sub not corner-loaded?

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post #93 of 102 Old 09-02-2013, 12:22 PM
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Any opinion on the proposed location, with the sub not corner-loaded?
That's also a crapshoot. You never really know where they'll work best until you try.

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post #94 of 102 Old 09-02-2013, 12:46 PM - Thread Starter
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Yeah, ok. Trying it involves making a hole in the wall, but the possible gain is likely worth trying.

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post #95 of 102 Old 09-02-2013, 01:22 PM
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Trying it involves making a hole in the wall, but the possible gain is likely worth trying.
You can test the placement by putting the cab tight to the wall, facing sideways, before cutting any holes.

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post #96 of 102 Old 09-02-2013, 02:44 PM - Thread Starter
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Great! Thanks!!! cool.gif

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post #97 of 102 Old 09-02-2013, 08:47 PM
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I really like having the sub close to the lp. Imo less output is needed to give the powerfull body shaking bass. In the spot it's in now I would guess you get a ton of that. Moving it across the room might take that away. Or you might have to push the sub harder to get close to it.

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post #98 of 102 Old 09-03-2013, 05:28 AM - Thread Starter
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I'm not sure about that. At those frequencies it's less about distance (unless it's right next to you) and more about room response, and my current spot is not very good and requires a lot of EQ. I'll move the sub up front for a test today or tomorrow to get an idea of whet the response would be in the proposed adjacent room location.

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post #99 of 102 Old 09-03-2013, 08:59 AM
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Originally Posted by psgcdn View Post

I'm not sure about that. At those frequencies it's less about distance (unless it's right next to you) and more about room response, and my current spot is not very good and requires a lot of EQ. I'll move the sub up front for a test today or tomorrow to get an idea of whet the response would be in the proposed adjacent room location.
+1. Distance to the LP makes a lot of difference where the wavelengths are shorter than the distance to the LP, but not much when they're longer, and room modes and pressurization become dominant.
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post #100 of 102 Old 09-06-2013, 05:47 AM - Thread Starter
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Maybe I should start a new thread in another section of the forum... I tried placing the THT up front, sideways. Not good. The blue line is back-of-room placement (with EQ removed) and the green line is front-of-room (XO on receiver set to 200 Hz; main speakers unplugged).

Would room treatment fix the huge loss from 30 to 50 Hz? What kind?

I am about to (finally) put in my suspended ceiling, so I'll need to try this again when it's done. But the ceiling is already filled with 6 inches of Roxul so i don't expect much change.


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post #101 of 102 Old 10-13-2013, 02:32 PM - Thread Starter
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I'll get around to posting REW outputs, but moving the THT from 3-4 feet away from one wall and 18" from the other, to up against the first and still 18" from the second has tremendously helped with my response. Sweet.

The 45-65 Hz dip is almost gone a one seat, and is actually now a bump at other seats.

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post #102 of 102 Old 10-13-2013, 04:32 PM - Thread Starter
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Here are measurements from the four LPs.
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