Bk Monolith-DF - Home Theater Forum and Systems - HomeTheaterShack.com

 
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post #1 of 21 Old 07-16-06, 02:06 PM Thread Starter
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Bk Monolith-DF

Manufacturer: BK Electronics
Model: Monolith-DF
Provided by: Timosetae
Manufacturer link: Monolith-DF
Price: 736 EUR

Manufacturer specs:
• System Type: 95 Litre reflex tuned to 20Hz, cabinet manufactured from veneered 25mm MDF and Critically braced
• Drive Unit: A 300mm / 12" twin magnet drive unit to increase linear excursion, a cast basket for a solid uncoloured projection of sound without ringing and vented pole piece to help reduce power compression
• Distortion: 5% 102dB @ 20Hz
• Frequency Response: 20Hz (-3 dB) / In Room 15Hz
• Amplifier Input / Output Impedance: High Level 100K - Low Level 10K - Balanced 10K
• Gain Control Range: 80dB
• Drive Unit Impedance: 4 Ohm
• Mains Input: 230V / 50Hz
• Dimensions: 420D X 604H x 540W
• Weight: 46.75kg
• Finishes: Black Ash Veneer, Light Oak Veneer and Cherry Veneer
• True 300W continuous discrete Mosfet amplifier
• 2 Years Warranty
• Truly hand built in Great Britain, when we claim hand built we mean hand built, as there are no SMD components or other automatic placement devices
• Forward Firing 300mm (12")
• Continuously variable frequency control
• Audiophile grade toroidal transformers
• Gas Tight Neutrik connection for long term consistency of sound quality
• Separate controls for high and low-level input adjustment
• Simultaneous connection of high and low level sources
• Balanced Inputs
• Thermal Protection
• Anti Thump
• ASP automatic speaker protection audibly transparent driver protection
• 4 x 16A output devices for effortless current control
• IEC Power Socket
• Doubled flared port for reduced port noise

Configuration as tested:
Phase: 0 degrees
Orientation: Standard down-firing



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post #2 of 21 Old 07-17-06, 09:57 AM Thread Starter
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+/- 3 dB points: 20 Hz - >200 Hz
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post #3 of 21 Old 07-17-06, 09:57 AM Thread Starter
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post #4 of 21 Old 07-17-06, 02:32 PM Thread Starter
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A gorgeous unit with a top-notch build quality. BK offers both front firing and down-firing versions; we tested the latter this time. The frequency response stays inside the 6 dB window all the way from 19 Hz to over 200 Hz. The crossover works as promised, though the low pass slope is on the shallow side. The shape of the frequency response is one of the best I've seen for a vented sub. The “trick” is that it doesn't have any high pass filtering below its tuning point. That of course can cause some problems when inputting a high level sub-tuning frequency signal. And in fact I did manage to bottom the driver right below 20 Hz at the highest sweep level. With program material you would really have to try to make this happen though. The Monolith offers quite high maximum SPL for a vented 12" subwoofer, especially when considering that it doesn't contain the latest and greatest woofer when it comes to Xmax parameter. The large 4" port stays almost noiseless even at max level. THD stays under 5% for most of the time, but naturally goes sky high below 20 Hz. Group delay stays exceptionally low at all frequencies for a vented sub. Spectral decay shows that there isn't very much ringing. Spectral contamination shows slightly higher than average maximum output capability with much lower than average overall distortion, though it just failed the 100 dB level.

+ Good extension and very good shape of the frequency response for larger rooms
+ Good maximum output capability and low power compression
+ Low distortion
+ Extremely low group delay and short decay time for a ported subwoofer
+ Price

+/- No high pass filter below the tuning frequency
- Not steep enough crossover
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post #5 of 21 Old 07-20-06, 12:09 PM
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Re: BK Monolith-DF

Can't wait Ilkka

good to see you here.
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post #6 of 21 Old 08-18-06, 08:29 PM
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Re: BK Monolith-DF

Ilkka,

Anything happening here? Just wondering what your comments are. I know you're a busy boy, but the English language community is awaiting further comment.

Russell
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post #7 of 21 Old 08-19-06, 03:13 PM
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Re: BK Monolith-DF

Hey russel.

Nice to see you here, how's your new EQ toy working for ya?.

I'm pretty interested to hear about the monolith too, haven't seen illka lately though. Maybe the english community(or at least part of it) hasn't shown enough interrest in his work. And kinda banned him from the AV forums.

Where the are you Illka?
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post #8 of 21 Old 08-21-06, 01:00 PM
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Re: BK Monolith-DF

The results for this subwoofer are really incredible.

FR: Nice and flat. In a room this would extend into the infrasonics nicely.
LF output: Great with 96 dB at 20 Hz
THD: Very Low above 22 Hz at 110 dB
Impulse Response: Exceedingly tight, as good as the sealed subs.
Decay: Precipitous
Price: 407 GBP which is 770 USD.

This much performance at that price? Is this thing for real Ilkka?

I'm going to find out how much it costs to ship one to the U.S.!

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post #9 of 21 Old 08-21-06, 03:37 PM
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Re: BK Monolith-DF

Quote:
Ayreonaut wrote: View Post
The results for this subwoofer are really incredible.

FR: Nice and flat. In a room this would extend into the infrasonics nicely.
LF output: Great with 96 dB at 20 Hz
THD: Very Low above 22 Hz at 110 dB
Impulse Response: Exceedingly tight, as good as the sealed subs.
Decay: Precipitous
Price: 407 GBP which is 770 USD.

This much performance at that price? Is this thing for real Ilkka?

I'm going to find out how much it costs to ship one to the U.S.!
It's a big forum (and personal) favourite over here, where it's sold online only. That's how they manage the price.

BK OEM manufacture for a number of other companies including MJ Acoustics and had a hand in manufacture of all of the early RELs dating back to the original Q50. They're no muppets. They design and manufacture all of their own amp panels (110-230v and available separatley for DIY) and their own cabinets (virtually any finish you like and all real wood veneers) but they use off the shelf drivers. In this case the Peerless XLS-12.

It's nearest competitor is the SVS PB-10 which sells for £370 ($700 US). I am guessing for that money you're well into PB-12 Plus territory where I suspect the competition is a little tougher and the obvious advantage it enjoys over here regarding wood veneers evaporates.

Ilkka's results for the Monolith make very interesting reading, especially when you compare it to the SVS 25-31 PC+ in 20Hz tune. Go on, flick back and forth.

I recently heard a friends PB-12 Plus and can assure you, once in a room, the SVS shows a clean pair of heals. But then it should, over here it costs twice as much as the BK. That said, I still can't believe the results I'm getting now it's EQ'd. I get a real big room gain from 25 to 32Hz, with the cuts I've applied at those frequencies, it just never runs out of steam and is effortless at reference levels. This may be helped by the smaller European room.

Russell
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post #10 of 21 Old 08-21-06, 03:48 PM
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Re: BK Monolith-DF

Quote:
dimmie wrote: View Post
Hey russel.

Nice to see you here, how's your new EQ toy working for ya?.

I'm pretty interested to hear about the monolith too, haven't seen illka lately though. Maybe the english community(or at least part of it) hasn't shown enough interrest in his work. And kinda banned him from the AV forums.

Where the are you Illka?
Hey up Dimmie,

So far the SMS-1 is working just great. It's got a new challenge comming after I made one of the biggest home cinema upgrades I've ever made. We repainted the room a muted mid blue - it was previously a pale cream sort of colour. This of course has had a staggering effect on the picture quality of my projector. None what-so-ever on the sound of course!

The DF has been moved from 1/4 of the way up the side of the room, to the back corner just behind the seating. The SMS-1 is going to have it's work cut out, because this beasty doesn't really need corner placement and I was cutting like a mad thing already. I never could make it work there with the BFD, but that was probably due to lack of patience as I had no way of using REW. With the on screen real time EQ it should be a lot easier, especially through the tricky crossover region. When my new, longer sub cable arrives to replace the previously redundant one I Ebayed 2 weeks ago (Doh!) I'll let you know how it goes and finally post some graphs.

Dunno where Ilkkas gone. Probably on a well deserved break from people flaming him, who don't understand that English is not his mother tongue and therefore that expression can get lost in the translation.

Russell
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