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Old 27th May 2011, 10:21 AM   #91
hawkson is offline hawkson  United States
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edit, save for later

Last edited by hawkson; 27th May 2011 at 10:25 AM.
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Old 27th May 2011, 11:40 PM   #92
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Quote:
Originally Posted by tb46 View Post
Hi revboden,

Sorry I didn't make myself clearer, maybe this will help:

Regards,
Yes, that helps. I must build two of these and test to see if the back reflections /top-to-bottom, are positive or negative in-room. I suspect all energy being reflected out is better but you never know with physics...

Cheers,
rev.
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Old 28th May 2011, 03:17 AM   #93
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Is the PPSL design feasible with 2 LMS Ultra 5400 or is 'too much'
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Old 28th May 2011, 03:36 AM   #94
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Quote:
Originally Posted by hawkson View Post
Is the PPSL design feasible with 2 LMS Ultra 5400 or is 'too much'
unless your room is the size of a medium sized theater... too much? yes.
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Old 28th May 2011, 03:47 AM   #95
hawkson is offline hawkson  United States
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huh, approximately how big would a ppsl be with 2 LMS Ultra 5400s?
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Old 28th May 2011, 04:18 AM   #96
hawkson is offline hawkson  United States
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Huh,

Well, I have 2 5400 Ultra LMS and I don't know what I should do with em. Should I only make a 1 sealed?
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Old 28th May 2011, 01:49 PM   #97
tb46 is offline tb46  United States
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Hi hawkson,

Just a quick simulation:

Regards,
Attached Images
File Type: jpg LMS Ultra 5400_BR_Input_SPL_comp.jpg (78.0 KB, 966 views)
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Old 28th May 2011, 02:47 PM   #98
GM is offline GM  United States
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Quote:
Originally Posted by hawkson View Post
Is the PPSL design feasible with 2 LMS Ultra 5400 or is 'too much'
'Too much' is an individual's choice. If I had a house capable of handling such output without having it collapse around/on me, a pair of DTS 'wannabes' and a few kW would be just about right for the dynamic headroom/low distortion/BW I'd want for some movies, games: AVS Forum - View Single Post - Top 5Hz-15Hz BluRey movies

GM
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File Type: gif TC Sounds LMS 5400 DTS wannabe - dual - 4 kW each.gif (17.4 KB, 947 views)
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Old 28th May 2011, 04:47 PM   #99
hawkson is offline hawkson  United States
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Thanks TB46. The graph you posted seems underwhelming. I am not sure I am reading it right, but LMS ultra 5400 achieving only 90 dbs at 20hz, is that right? BTW< I have Lab Gruppen 14000 powering these.

GM, thats the LMS Ultra 5400 series 2? I believe I have an older version of the lms 5400...
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Old 28th May 2011, 05:06 PM   #100
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Dunno, it's whatever someone posted awhile back: ~19 Hz Fs, 0.31 Qts, 235.5 L Vas

GM

edit: hmm, they are somewhat different than Ricci's, but don't know which specs are earlier or if his are measured........
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Last edited by GM; 28th May 2011 at 05:08 PM.
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