DIY Monolith subwoofer

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asdonk

Active Member
today my MF300 and ASBF arrived and together with the new Peerless XXLS12 woofer I 'm going to build a Monolith subwoofer
the diference is that the subwoofer will have a sealed enclosure with a internal volume off 62 litres as advised by Peerless
the XXLS12 is developed out off the XLS range
I have the subwoofer already running as a prototype together with a BSBd200
subamp from BK with very good results :thumbsup:
they make great amps those guys at BK
 

asdonk

Active Member
ofcourse it will , the shape off the enclosure is a pentagon, no not the one
in Washington, and has 40 mm panels
the first question what comes up is why filling the enclosure with damping material to make it look 10 % bigger , as the woofer sees it
first test with a cd full off test tones lets the sub go down to a 25 hz in room
fast and depp bass without any booming
 

sonic65

Standard Member
The filling material should be of cellular form so air is present throughout the material.
The presence of this material slightly increases the effective volume as the sound wave is reduced in speed by passing through it. Therefore the time taken to reach the walls of the enclosure is longer and the box appears apparently larger.
I have just bought a BK BSBP 500watt plate amp and can say the quality is outstanding. I particularly like the switchable EQ and is currently set on +6dB. at 15Hz. Results on my Peerless XLS 12" indicate a really low bottom end. (Not measured it yet.) I am waiting for the Lab12 driver as used in the Monolith to become available (subject to satisfactory TS parameters.)
 

Timbo21

Well-known Member
I love the pentagon, no parallel sides and all that :thumbsup: .

I wish I knew enough about all this to do that :( .

Good luck to you :thumbsup: .

Let us know how much you're selling them for ;)

T :)
 

asdonk

Active Member
selling no way, I did get the pentagon enclosure for free
they are made off what we call in dutch waterrecistant multiplex
and it is 40 mm thick and 40 kg
 

Nimby

Distinguished Member
Very impressive construction! :smashin:

We really ought to demand a response curve from you if you have an SPL meter. :)

Regards
Nimby
 

asdonk

Active Member
I think Im will first buy a BFD to get the best results
 

MADMAND

Banned
sonic65 said:
The filling material should be of cellular form so air is present throughout the material.
The presence of this material slightly increases the effective volume as the sound wave is reduced in speed by passing through it. Therefore the time taken to reach the walls of the enclosure is longer and the box appears apparently larger.
I have just bought a BK BSBP 500watt plate amp and can say the quality is outstanding. I particularly like the switchable EQ and is currently set on +6dB. at 15Hz. Results on my Peerless XLS 12" indicate a really low bottom end. (Not measured it yet.) I am waiting for the Lab12 driver as used in the Monolith to become available (subject to satisfactory TS parameters.)
BK are already selling the monolith LAB12 subwoofer in its unmodified state and have done for quite a while it is manufactured by EMINENCE. http://www.bkelec.com/Pro/Drive_Units/Eminence/Lab12.htm
 

asdonk

Active Member
looks good the LAB12 woofer but is it not that much different from the modified LAB 12 used in the Monolith subwoofer
the original Lab12 can be used in a 50 ltr sealed enclosure with good results
some bass boost at 20-25 hz might be needed
 

sonic65

Standard Member
I am after the modified LAB12 mainly because it has a butyl rubber surround rather than the foam type. In the past my experience with foam surrounds on other makes of speakers has not been very successful, particularly in the longevity of the material. I hope to obtain the full Thiele-Small parameters from BK, although the free air resonance is easy enough to determine.
 

asdonk

Active Member
I think the modified lab12 is hard to get
maybe specially made for BK, I also searched the web but cannot find any info
or datasheets
 

sonic65

Standard Member
Yes the modified LAB12 is specially made and if not obtainable I will go for another XLS12 as this has a lower Fs than the XXLS12.
 

asdonk

Active Member
what enclosure is the xls12 coming in, refle loaded or sealed
 

sonic65

Standard Member
Designing a twin XLS12 or modified LAB12 reflex cabinet powered by the BK BSBP 500 plate amp but need the TS parameters first. I think your pentagon cabinet is quite something. How did you get those joints so accurate?
 

asdonk

Active Member
these cabinets are build by a professional and I did get them for free
I have 2 off them and i am planning to build a second subwoofer to complete my second stereo set consisting off Focal Triga diy speakers
 

asdonk

Active Member
I am so pleased with the peerless xxls12 so i have plans to build a second
sub as i also have a second pentagon cabinet
the sub will be a peerless xxls12 type 830847 which comes into a 58 ltr basreflex volume, the F3 is 32 hz and with a little boost it wil rech 25 hz without a problem
 

asdonk

Active Member
today ordered the peerless xxls12 woofer for the basreflex subwoofer
it was not at the store and had to be ordere
so I will first fix the enclosure
 
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