| Attn:BillW [message #28176 is a reply to message #28174] |
Tue, 17 October 2006 05:46   |
Leland Crooks
Messages: 212
Registered: May 2009
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Master |
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BillW wrote I'll have them loaded with EVM15B's since that's all I have, the only difference is the xmax is a lot less, so less overall SPl's I pulled that quote from bill's forum. It appears they do make a big difference. What width are your t36's? From looking at the charts I'd say you should change the drivers. You're not getting what you should. I wish I'd been there, got usurped by another more pressing project.  The new bassmax appears pretty sweet. I'll be looking forward to the completed postings.
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| Re: Prosound Shootout 2006 Measurements [message #28177 is a reply to message #28175] |
Tue, 17 October 2006 08:52 |
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Wayne Parham
Messages: 18783
Registered: January 2001
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Illuminati (33rd Degree) |
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I would have loved to see the distortion and max SPL of the JBL and Soundbridge subs. They did very well in terms of response. You can see the distortion measurements of the Fitzmaurice, Bassmaxx and 12π basshorns in last year's measurements, but we didn't measure maximum SPL or distortion this year. The LMS system wasn't available, so Praxis was used instead.
I wrote the test plan and performed the measurements last year with LMS. The test plan was really written for LMS, and Praxis is a little different both in the way it works and the way you use it. So the test plan may not have been useful for Praxis. David Lee did the measurements, so perhaps he will chime in. I pretty much left the test setup and operation to him, since he had experience with Praxis.
What we do have are frequency response at 10 meters, which is 20dB down from the 1 meter figure. So add 20dB to the scale of the charts for 1m levels. We measured individual speakers and pairs, and in the case of the Tuba 36, we also measured a group of four.
As for the 12π basshorn, the ones we brought this year were a production model that has a slightly different motor chamber. We made it different for manufacturing reasons, and you can tell the difference in the response chart. The production version has a little more ripple than the prototype, but it's still very good at only about 2dB.
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| Re: Attn:BillW [message #28179 is a reply to message #28176] |
Tue, 17 October 2006 11:10 |
Bill Wassilak
Messages: 402
Registered: May 2009
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Illuminati (1st Degree) |
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Leland,
Looks like I'm going to have to change drivers. My cabinets are 36x36x20" wide, which is the narrowest Bill F. recomends and because of transportation reasons. What gets me is how the EV's drop like a rock below 60Hz just like they do in a reflex cabinet. Even though there not true subwoofer drivers.Bill W.
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| Re: Attn:BillW [message #28180 is a reply to message #28179] |
Tue, 17 October 2006 14:10 |
lelandcrooks
Messages: 12
Registered: May 2009
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Chancellor |
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Yea, that's what I was looking at also. It seems to me it's got to be driver related. Even the narrow box shouldn't drop that fast, especially when you started running mulitples and the mouth area expands. They've got to be unloading at that point, which with the narrow box makes sense, and the ev's don't have the guts to go into dr mode and pickup the difference.
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| Re: Prosound Shootout 2006 Measurements [message #28181 is a reply to message #28177] |
Tue, 17 October 2006 16:02 |
josh
Messages: 9
Registered: May 2009
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Esquire |
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The Tuba 36 didn't do too well, but these sound bridge guys look like the winner of this party. I've never even heard of them but their cabinet seems to do some great things + the Pi as always is gonna be a good one. So this was all just sensitivity and frequency response? I would of loved to see you guys burn up the drivers of every speaker finding out what the boxes can ACTUALLY do. -Josh Billings
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| Re: SPL [message #28182 is a reply to message #28178] |
Tue, 17 October 2006 16:18 |
Brady
Messages: 1
Registered: May 2009
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Esquire |
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It may have done okay, but not compared to what most of us Tuba owners are used to seeing. I do not doubt for a minute that my smaller Tuba 30 slim, at 24" wide, and about the same mouth area as those Tuba 36 slims, 20" wide, but loaded with Definimax 4012's would put those Tuba 36's to shame. Now when Bill W gets those reloaded with proper drivers, as I hear he plans to, that should change things quite a bit  Bill W, Go get those new drivers, it'll put a big smile on your face Now don't mis understand my boosting...LOL.. I wouldn't have expected the T36 20" wide to steal the show by any stretch, but I believe they would have had a better showing, particularly in the low frequency range. If you ever have a shootout in Utah or South Eastern Idaho, let me know...hehe. I'd love to go to one of these things, but being the poor guy I am, my wife would strangle me if I tried to budget out a long trip like that just to check out some subwoofers...LOL. Wayne, those 12Pi subs of yours look pretty awesome!
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