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Old 25th July 2010, 12:06 PM   #11
wood1y is offline wood1y  Hungary
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I dont think this RCF reaches the Xmax limit, even if i drive it with 800 W. Note, that u are playing music, not sinewaves what the hornresp predicts.

For example: The hornresp Displacement graph says, that the excursion of the LF15G401 is 13,2 mm if the total 800W RMS(!) is on a 50 Hz sinewave.. Thats never gonna happen.

Danley is using in a 40Hz TH the B&C 15 TBX 100 which has an xmax value of 9mm, and 1000W power.
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Old 25th July 2010, 05:01 PM   #12
FlipC is offline FlipC  United States
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Nice job.
Release the info.
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Old 26th July 2010, 09:26 PM   #13
iand is offline iand  United Kingdom
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Quote:
Originally Posted by wood1y View Post
I dont think this RCF reaches the Xmax limit, even if i drive it with 800 W. Note, that u are playing music, not sinewaves what the hornresp predicts.

For example: The hornresp Displacement graph says, that the excursion of the LF15G401 is 13,2 mm if the total 800W RMS(!) is on a 50 Hz sinewave.. Thats never gonna happen.

Danley is using in a 40Hz TH the B&C 15 TBX 100 which has an xmax value of 9mm, and 1000W power.
Indeed he is -- whether this is an issue or not depends very much on the type of music you're playing and how big the amp is, instruments like bass guitar or kick drum probably won't have a problem, synth bass on dubstep (not that I play this but some people do :-) probably will.

Since one of the tapped horn advantages is low distortion, it seems a shame to run the risk of adding distortion back again by running out of Xmax -- which is what will happen with the RCF if you do hit it with 800W sinewave at 40Hz, that's why it won't reach 13mm.

Given that they're available, I'd pick a driver with more Xmax -- *if* I was going to drive it heavily -- to make sure this didn't happen. If you're not doing this and don't play music where the bass resembles swept sinewaves then the RCF driver will be fine with 800W, as is the B&C with 1000W (or more on most music).

And as I said, more Xmax usually means more money...

Ian

P.S. The driver in the TH118 has >2x the volume displacement of the 15TBX100 as well as more power handling, so this is less of an issue.
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Old 27th July 2010, 05:18 AM   #14
Sherry is offline Sherry  China
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good job
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Old 28th July 2010, 01:16 PM   #15
epa is offline epa  Netherlands
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can you post the hr input?
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Old 29th July 2010, 03:49 AM   #16
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marvelous! please release the plan :-)
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Old 30th July 2010, 05:18 AM   #17
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Quote:
Originally Posted by panjilaras View Post
marvelous! please release the plan :-)
YES!

(And) Anyone care to try getting this type of response, but tuned to 30 or 35Hz? (electronic music i.e. dubstep/d&b)
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Old 30th July 2010, 07:56 AM   #18
bjorno is offline bjorno  Sweden
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Quote:
Originally Posted by CRESCENDO View Post
YES!

(And) Anyone care to try getting this type of response, but tuned to 30 or 35Hz? (electronic music i.e. dubstep/d&b)
FYI, TH tuned at 37 Hz:

b
Attached Images
File Type: jpg RFC-LF15G401_368L_TH.JPG (334.2 KB, 1323 views)

Last edited by bjorno; 30th July 2010 at 08:20 AM.
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Old 30th July 2010, 08:36 AM   #19
bjorno is offline bjorno  Sweden
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Quote:
Originally Posted by bjorno View Post
FYI, TH tuned at 37 Hz:

b
Replacing the picture with corrected information:

b
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File Type: jpg RFC-LF15G401_368L_TH.JPG (333.3 KB, 1226 views)
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Old 30th July 2010, 02:36 PM   #20
epa is offline epa  Netherlands
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Quote:
Originally Posted by CRESCENDO View Post
YES!

(And) Anyone care to try getting this type of response, but tuned to 30 or 35Hz? (electronic music i.e. dubstep/d&b)
i came up with this LIVE SOUND Specific Tapped Horn thread...
its a bms 18 n 850 v2

its a ~500 ltr box or if you make the inside pannels 60 cm(~600ltr) instead of 50 ad ~2.5 db
Click the image to open in full size.
the pic is the 600 ltr version
no free lunch indeed

Last edited by epa; 30th July 2010 at 02:59 PM.
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