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Two sub design options Eminence Lab 12 in 95 liters or Lab15 in 150 litres
Two sub design options Eminence Lab 12 in 95 liters or Lab15 in 150 litres
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Old 9th June 2018, 04:25 PM   #1
darkmatter is offline darkmatter  United Kingdom
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Lightbulb Two sub design options Eminence Lab 12 in 95 liters or Lab15 in 150 litres

Looking at options for 4 subs in room for a friend.

Been messing about with some designs and the Eminence Lab 12 seems to model best in near 100 litres tuned to around 20Hz or

Is there any real advantage of going for the Lab 15 in around 150 litres? again tuning to around 22Hz or a bit above, as the fs is surprisingly higher than the Lab 12

Thanks.
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Old 9th June 2018, 04:31 PM   #2
chris661 is offline chris661  United Kingdom
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How big's the room, how loud/low do they want to go, and what amplification/processing do they have?

IME, 4x ported 12"s in a UK living room would have far more output than would ever be useful, unless they routinely throw loud parties.

Chris
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Old 9th June 2018, 04:47 PM   #3
darkmatter is offline darkmatter  United Kingdom
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Chris,

18' x 25' x 9' ceiling
500w into 4 ohms each unit
20Hz preferably down to 16Hz in room
Sufficient for full orchestral full classical organ

Trying to decide if there is any performance advantage of going for the Lab 15" unit
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Old 9th June 2018, 06:38 PM   #4
chris661 is offline chris661  United Kingdom
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"Demo" levels are usually around 105dB peaks at the listening position.

Without factoring in boundry/room gain, a set of four sealed 12"s will do 16Hz at 105dB @1m (ie, the only note playing is that bottom C, and it's at full power - not likely to happen, but headroom is good) with just over 13mm of excursion.

Factor in boundry gain, room gain, etc and four sealed 12"s will probably be more than adequate. No need to go ported.

Size the sealed box so that the desired power input allows it to reach Xmax, and EQ away.

Chris
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Old 9th June 2018, 08:20 PM   #5
Etocynned is offline Etocynned
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Room gain will kick in at 45hz. Ive seen some great lab 12 boxes built that extend below 30 in here... 45l sealed boxes would be flat to 10hz with room gain and xmax wouldnt exceed 19mm at 500w input. With 4 in a room you should get great sound and proper placement will reault in even bass at all listening positions.
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Old 10th June 2018, 09:00 AM   #6
jccart is offline jccart
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I had a bk electronics monolith plus and to be honest there was a lot of port noise on the lower notes .it was distracting
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Old 10th June 2018, 10:39 AM   #7
darkmatter is offline darkmatter  United Kingdom
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Quote:
Originally Posted by chris661 View Post
"Demo" levels are usually around 105dB peaks at the listening position.

Without factoring in boundry/room gain, a set of four sealed 12"s will do 16Hz at 105dB @1m (ie, the only note playing is that bottom C, and it's at full power - not likely to happen, but headroom is good) with just over 13mm of excursion.

Factor in boundry gain, room gain, etc and four sealed 12"s will probably be more than adequate. No need to go ported.

Size the sealed box so that the desired power input allows it to reach Xmax, and EQ away.

Chris
Interesting thanks, Chris.


Quote:
Originally Posted by Etocynned View Post
Room gain will kick in at 45hz. Ive seen some great lab 12 boxes built that extend below 30 in here... 45l sealed boxes would be flat to 10hz with room gain and xmax wouldnt exceed 19mm at 500w input. With 4 in a room you should get great sound and proper placement will reault in even bass at all listening positions.
Thanks Etocynned, A question.

How much EQ would be required to achieve this? I would rather use, if I needed, the EQ profiles built into this plate amp.

BSBPV500

Manual and details here, last two pages for details

http://www.bkelec.com/modules/BSBPV5...structions.pdf

Last edited by darkmatter; 10th June 2018 at 10:45 AM.
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Old 10th June 2018, 10:45 AM   #8
chris661 is offline chris661  United Kingdom
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You're going to need a lot more EQ than that to get a multi-sub setup working properly. I'd budget for something like a MiniDSP 2x4 and go for rack mounted amplifiers.

Chris
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Old 10th June 2018, 10:58 AM   #9
darkmatter is offline darkmatter  United Kingdom
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Quote:
Originally Posted by chris661 View Post
You're going to need a lot more EQ than that to get a multi-sub setup working properly. I'd budget for something like a MiniDSP 2x4 and go for rack mounted amplifiers.

Chris
I will have to investigate further, not familiar with it, just searched it 2 i/p four o/p so it will handle four subs

miniDSP in a BOX : miniDSP 2x4

miniDSP in a BOX : miniDSP 2x4 HD

Last edited by darkmatter; 10th June 2018 at 11:02 AM.
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Old 10th June 2018, 11:06 AM   #10
darkmatter is offline darkmatter  United Kingdom
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My only concern with this is that using it between pre/pow amps would compromise transparency of a high end system. Presumably it could be driven separately from a spare set of pre-amp outputs, separate from them main replay chain, so as to not compromise the main system?

Last edited by darkmatter; 10th June 2018 at 11:16 AM.
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