I have just bought 4 TC sounds LMS 18" ultras. I realize these subs work very well in small enclosures, but without compromise what would be the ideal sealed box volume for a single driver in a single enclosure?
Q No. 2, I was thinking of going with this amp PS7000s, anyone know if this amp will do the job when bridged? The sub is rated at 2000w continuous so I was thinking it should be ok?
But I would love to hear from those in the know.
Cheers
Q No. 2, I was thinking of going with this amp PS7000s, anyone know if this amp will do the job when bridged? The sub is rated at 2000w continuous so I was thinking it should be ok?
But I would love to hear from those in the know.
Cheers
Hi Dave,
Agree if you target a use for stands(~68L) and at high power but for sub use I would chose a ported solution(~150L) that if the ports are closed could also sound very good if placed near a wall (still stands) as the Qtc would be lowered to ~0.53.
b🙂
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Ported box. Now I would definitely need help designing a box with the correct size and length port. Not to mention at what frequency I should tune it too.
My main reason to go sealed(Apart from the difficulty in designing a ported enclosure) was b/c the roll off would be much more gradual and I could use the room (being completely sealed concrete bunker) to even further reduce the roll off. I was hoping for at least 10hz +/- 3dB in room response. (Room size of 3200cf)
My main reason to go sealed(Apart from the difficulty in designing a ported enclosure) was b/c the roll off would be much more gradual and I could use the room (being completely sealed concrete bunker) to even further reduce the roll off. I was hoping for at least 10hz +/- 3dB in room response. (Room size of 3200cf)
You can also use a program like WinISD or Boxsim (both free tools) to simulate the ideal box size for a given Q and alignment.
LinearTeam
http://www.boxsim.de/download/Boxsim120en.zip
Good luck!
LinearTeam
http://www.boxsim.de/download/Boxsim120en.zip
Good luck!
I've played with those drivers 🙂 I'd recommend sealed (very thick and well braced) 169L with a DSP to boost if needed. Four of them in a space that size will... well actually you could hurt yourself. Normally I'm a Large and Low BR kinda guy but these drivers would need a very large port to go to 10Hz. You have so much potential in the drivers the DSP option is a simple choice.
@revboden, yes I am finding that out with winISP.
I am going to go back to my original idea of sealed. Why do you suggest 169L? and I am assuming that is minus the bracing and driver?
I am going to go back to my original idea of sealed. Why do you suggest 169L? and I am assuming that is minus the bracing and driver?
If you are going active / DSP controlled a linkwitz transform could be your ticket to 10Hz in room response with a sealed design..
ESP - The Linkwitz Transform Circuit
ESP - The Linkwitz Transform Circuit
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With subwoofers I like to keep the Qtc ~.525 to keep the driver close to critically damped, this allows as much low-end as possible while still helping to control the driver motion.
below .5 is under-damped, .5 is critically damped, above .5 is the range of over-damped. see pic.
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