Bk Monolith-DF - testi

[Zipman]

Manufacturer: BK Electronics
Model: Monolith-DF
Provided by: Timosetae
Manufacturer link: http://www.bkelec.com/HiFi/Sub_Woofers/monolith-df.htm http://www.mareks.fi/?p=productsMore&iProduct=321
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 4" port for reduced port noise

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

[Zipman]

+/- 3 dB points: 20 Hz - >200 Hz

[Zipman]

[Zipman]

[Zipman]

[Zipman]

[Zipman]

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

[Matthew]

These graphs are looking excellent. I especially like the impulse response, well there's the slight ringing around 20Hz but it fades out quite fast...
Janolle (on the HSU thread) said that this might be because there's no high-pass filter. Any more info on this? I never liked the idea that you'd have something extra on the signal path anyway

The measurements are quite close to the normal Monolith, as you would expect. Since the subs are nearly identical.

I've always wanted a fast and an analytical subwoofer with a small amount of distorsion (under 10% is not that much for a sub anyway) and never had the money for a proper Velodyne. So this sub is just what im looking for

I didn't know I had psychic abilities since i ordered this sub in the beginning of this month.
She's coming home next week

[petepeluri]

Tietääkö joku miten kyseisen subbarin vahvistimessa oleva ASP Automatic Speaker Protection toimii käytännössä?

[Zipman]

Tietääkö joku miten kyseisen subbarin vahvistimessa oleva ASP Automatic Speaker Protection toimii käytännössä?

Limitteri rajoittaa maksimitasoa melko tehokkaasti. Särö ei pääse nousemaan kovin korkeaksi, eikä subbarista kuulu pahoja häiriöääniä. Elementin pohjausta erittäin kovilla tasoilla alle 20 Hz taajuuksilla se ei pysty estämään. Monolith siis pohjasi kahdella korkeimmalla pyyhkäisyllä (105 dB ja 110 dB). Ja tämähän johtuu siitä, koska siitä puuttuu kokonaan ylipäästösuodin (subsonic), joka normaalisti kaikissa refleksisubbareissa on (koska kotelon vastapaine katoaa viritystaajuuden alapuolella).

[bossobass]

This is a good example of the SC graph's worth, IMO.

If you overlay the graphs of, say, the HSU VTF-3 at 90dB and the SVS 12/2 at 95dB (comparing a 1X12 to a 2X12 for lack of a better choice at this time), and click back and forth, you'll quickly see that the self noise signatures are nearly identical.

If you then compare the graphs of the HSU and the Monolith (both at 90dB), you immediately see the difference in self noise signature.

If you would then A/B the subs subjectively, you would begin to hear what the differences, if any, might be described as and be more able to attribute subjective terms to a SC graph within a very reasonable margin of error.

What's left beyond that are issues relating to time (GD, IR, SD) and max output in any given venue is easily solved by using multiples of sub to keep a given model operating within it's designed limits.

In any case, the Monolith seems to be an extraordinary bargain for those who need an entry level sub for a smaller space or just don't require higher output.

It would be nice if some owners would post in-room graphs and tell the size of the room and what mains are being used with the Monolith

Bosso

[petepeluri]

Limitteri rajoittaa maksimitasoa melko tehokkaasti. Särö ei pääse nousemaan kovin korkeaksi, eikä subbarista kuulu pahoja häiriöääniä. Elementin pohjausta erittäin kovilla tasoilla alle 20 Hz taajuuksilla se ei pysty estämään. Monolith siis pohjasi kahdella korkeimmalla pyyhkäisyllä (105 dB ja 110 dB). Ja tämähän johtuu siitä, koska siitä puuttuu kokonaan ylipäästösuodin (subsonic), joka normaalisti kaikissa refleksisubbareissa on (koska kotelon vastapaine katoaa viritystaajuuden alapuolella).

Mutta mistä vahvistin tietää milloin liikutaan liian suurilla tasoilla?

[Zipman]

Mutta mistä vahvistin tietää milloin liikutaan liian suurilla tasoilla?

Riippuen limitteristä, se voi lukea moniakin eri arvoja, joita sitten vertaa ennalta asetettuihin arvoihin. Mistä auton kierrosluvunrajoitin tietää missä punaraja on?

[petepeluri]

Riippuen limitteristä, se voi lukea moniakin eri arvoja, joita sitten vertaa ennalta asetettuihin arvoihin. Mistä auton kierrosluvunrajoitin tietää missä punaraja on?

No siksi kysyin kun omassakin tuotoksessa on Asp, joten kiinnostaisi tietää toimintaperiaate ja se että rajoittaako tuo subwooferin toimintaa miten.

[Zipman]

No siksi kysyin kun omassakin tuotoksessa on Asp, joten kiinnostaisi tietää toimintaperiaate ja se että rajoittaako tuo subwooferin toimintaa miten.

Mikäs vahvistin sinulla olikaan?

[petepeluri]

Mikäs vahvistin sinulla olikaan?

Bsbpv-500.
Bkelec ei ainakaan aikaisemmin vastannut johonkin kysymykseeni, tiedä sitten nyt.

[Hartsaa]

Petepeluri, kaverillani oli tuo samainen vahvistin ja sen jatkeena peerless r15" refleksilootassa.

Hetken demottelujen yhteenveto oli että rajoittaa kunnon tykittelyä aika rajusti -> yhteydenotto bkelecille ja sieltä tulikin sitten tuon limitterin poisto-ohje melko nopeasti

Toimi siis näin jos haluat ostella usein elementtejä

Toki sun käyttämä suljettu kotelo suojaa aika kivasti.

[Hartsaa]

Tässäpä se:

ASP Remove

[Vega_]

Laitetaanpa tänne, niin tästä voi olla muillekki hyötyä.

Jos Monolithiin tekee ylipäästösuotimen, niin mikä olisi hyvä rajataajuus?