TH-18  Flat to 35hz!  (Xoc1's design) TH-18 Flat to 35hz! (Xoc1's design) - Page 76 - diyAudio
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TH-18  Flat to 35hz!  (Xoc1's design)
TH-18  Flat to 35hz!  (Xoc1's design)
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Old 31st August 2012, 12:35 PM   #751
Samuel Jayaraj is offline Samuel Jayaraj  India
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Thanks CRESCENDO for the quick response.

So what is the clipping power of the QSC PLX3402 into a 4 ohm load, according to the manual/technical specifications?
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Last edited by Samuel Jayaraj; 31st August 2012 at 12:54 PM. Reason: Edited after reading Crescendo's last response.
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Old 31st August 2012, 03:33 PM   #752
kctess5 is offline kctess5  United States
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I don't use a controller. I use turntables (with Serato Scratch Live). A controller would be nice to have in college tho. I'd go with either the Vestax VCI-300 or the newer VCI-380 (both are compact; both use Serato Itch) or one of the Pioneer units (bigger); one integrates Serato Itch - the other, Traktor.
I was thinking of getting the Denon MC3000, and then adding on Traktor Kontrol F1's when I had the budget. I like tractor, and I see myself using one shots and cues much more than scratching
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Old 31st August 2012, 03:35 PM   #753
NEO Dan is offline NEO Dan  United States
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TH-18  Flat to 35hz!  (Xoc1's design)
Quote:
Originally Posted by Samuel Jayaraj View Post
Thanks CRESCENDO for the quick response.

So what is the clipping power of the QSC PLX3402 into a 4 ohm load, according to the manual/technical specifications?
Google not working in India Sam?
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Old 31st August 2012, 08:26 PM   #754
Samuel Jayaraj is offline Samuel Jayaraj  India
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Originally Posted by NEO Dan View Post
Google not working in India Sam?
Thanks for the nudge.

I looked it up and it says, Bridged power of 3400 Watts into 4 Ohms @ 1% THD, 1 KHz.

In that case, reaching mid 126, 127 db in a TH-18 is not much.

The B&C 18SW100 rated at 3000W, 97db should reach the same SPL even in a BR enclosure.

What are we missing here?
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Old 31st August 2012, 08:40 PM   #755
NEO Dan is offline NEO Dan  United States
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TH-18  Flat to 35hz!  (Xoc1's design)
I would guess that these drivers are 8 ohm?
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Old 31st August 2012, 10:35 PM   #756
Djim is offline Djim  Netherlands
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Quote:
Originally Posted by Samuel Jayaraj View Post
Thanks for the nudge.
I looked it up and it says, Bridged power of 3400 Watts into 4 Ohms @ 1% THD, 1 KHz. In that case, reaching mid 126, 127 db in a TH-18 is not much. The B&C 18SW100 rated at 3000W, 97db should reach the same SPL even in a BR enclosure.
What are we missing here?
Hi Samuel,

Your question is probably based on theoretical models instead of real world events. In the reality all enclosures and drivers suffer from system losses of all kinds:
A) Thermal Compression
B) Dynamic Compression (result of boundary effects, changing acoustic air properties ect)
C) Building errors (driver volume is not compensated in the S4 area, extra corner volume ect).

In reality basreflex do meet their predicted max level output (above a certain frequency) because the basreflex port starts to increase its stiffness (port compression) as power is increased. This is the result of the relative small bass-port. The effect is that the low end of the basreflex is less than predicted but the area above gains in level and does meet its predicted level. Often you will see the opposite in Tapped Horns and horns in general.

Last edited by Djim; 31st August 2012 at 11:04 PM.
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Old 1st September 2012, 12:05 AM   #757
CRESCENDO is offline CRESCENDO  United States
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Originally Posted by NEO Dan View Post
I would guess that these drivers are 8 ohm?
Correct!

Anyone know how the clip limiter in the PLX3402 works? I'd like to know how it affects the signal.

Last edited by CRESCENDO; 1st September 2012 at 12:07 AM.
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Old 1st September 2012, 02:18 AM   #758
NEO Dan is offline NEO Dan  United States
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TH-18  Flat to 35hz!  (Xoc1's design)
It should lower the gain to offset the overdrive, but you can turn it off for testing via switches 1&10.
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Old 1st September 2012, 02:29 AM   #759
CRESCENDO is offline CRESCENDO  United States
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I understand the overall affect - I'm more interested in the specific amount and rate. I engaged the clip limiter thinking it would be a little safer than sending a clipped signal to the driver.
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Old 1st September 2012, 02:31 AM   #760
NEO Dan is offline NEO Dan  United States
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TH-18  Flat to 35hz!  (Xoc1's design)
My ESP is currently out of service I'd suggest you e-mail QSC...
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