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BFD Review Finally!!!!!!!!!!

Discussion in 'Subwoofers' started by Apocalypse, Jan 30, 2003.

  1. Apocalypse

    Apocalypse
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    Due to the numerous pictures I decided to do the review on my own webspace. If you have any questions or criticisms just fire away, I'm not the type to get bitter from constructive criticism :)

    REVIEW

    Phil
     
  2. Spligsey

    Spligsey
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    Phil.
    Good review mate.......nicely done.

    Not sure on the bath mat though:D :D :D

    Adz
     
  3. Apocalypse

    Apocalypse
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    Yeah I was wondering when that would come back to haunt me, it came free with a shower curtain and it's never been used so that's my excuse :blush: :D
     
  4. groundy

    groundy
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    Nice review - could you elaborate a little more on how it's connected up - I'm not sure I fully inderstood that part.
     
  5. Apocalypse

    Apocalypse
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    Hi m8, there are 2 seperate sets of inputs because the BFD was designed for stereo. Each input consists of "Input" and "Output" and they each come in either XLR or 6.3mm jack connections. Think of it as a 2 channel power amplifier with jacks/XLR instead of RCA connectors. You can use either channel (it's called an engine on the BFD) to power a single sub or you can use both to power a dual sub setup. If like me you intend to use RCA to 6.3mm jacks all you need is the adapters and another phono lead. As I allready had spare phono leads all it cost me was £6 for the two adapters.
     
  6. GaryG

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    Nice review Phil, how you have the patience to photograph each step is beyond me.

    An optimisation I use now after doing so many sweeps is to just sit in the listening position and watch the spl meter as I sweep the frequency. I do one overall sweep to see where the problems lie and then another sweep dealing with each peak in turn as I encounter it, it's much quicker than using the spreadsheet. Obviously if you got the sub in the best location there's no need to keep doing it, but I took the view that I wouldn't know if I had the best location for the sub unless I moved it around the room and measured it's response.

    A couple of suggestions if I may be so bold.

    1. Use four blobs of Blu-Tac to seperate your BFD from the surface on which it sits (much better de-coupling than a mat).

    2. Avoid placing it on the sub if possible. The BFD has capacitors in it which are 'microphonic', their capacitance varies due to the mechanical vibration from the sub which in turn affects the sound. This is only a small point but if you can mount it elsewhere you might as well.
     
  7. Paden

    Paden
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    Phil thanks for the review & the links you provided.

    I'm a little unclear on a couple of matters though :confused:

    When setting the input level to your BFD do I understand correctly that you play a film with the loudest bass you have as loud as you're ever likely to play it? (me thinks the Haunting :eek: )

    In your review you say
    "Once you set this you can only adjust the sub's output with the volume control on the sub"
    After you've adjusted the input level to your BFD to just below clipping, you have to
    "adjust the output level (volume control) on your sub to equal your mains" (Sonnie Parker's guide).
    Do you do this at 75dB?
    If so how do you get your main speakers to this level if you can't adjust the amp volume during the calibration?

    Cheers, Paul
     
  8. James45

    James45
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    Great review Phil... even I understood that! Certainly sounds like a fantastic investment for £100, although it looks as though your BFD is plumbed into the water supply! You're not doing a Comer water-cooling jobbie are you?!:D
     
  9. Steve Bate

    Steve Bate
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    Excellent post Phil, you've obviously got far too much time on your hands :D :D

    Welcome to the happy world of BFD :D

    Steve
     
  10. magking

    magking
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    Great review Phil.
    I'm thinking of getting one myself. I have some problems also with a small room and a Godzilla. My room is 3,5*4,5m so it's a little larger than yours.

    Question is, here in Norway it cost's 150£, where can i get i cheaper? And they've got to ship to Norway.
     
  11. GaryG

    GaryG
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  12. NicolasB

    NicolasB
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    Apoc, I have to assume that you're using some sort of microphone to generate those graphs, but you don't mention it in your hardware list....
     
  13. rjw

    rjw
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    Radioshack SPL. It's in the top picture IIRC.
     
  14. magking

    magking
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    GaryG
    No, but i found it here for the same price earlier 1795NOK = 158£

    If the price in the UK is under 100£ i think i'll get it from there. I have a friend which can get things from UK to Norway for free and without any papers, so there is no WAT.

    Any cheap UK shops that have this?
     
  15. GaryG

    GaryG
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  16. magking

    magking
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    Thanks.
    I'll have to wait to get one until the next payday.
    I'm still a little short on money after getting Godzilla in Desember.:blush:
     
  17. Apocalypse

    Apocalypse
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    I'll try and answer everyone's questions but I'll start with yours Paul. When you set the input level of the BFD in the bypass mode you can see LEDs on the main display, there are about 10 green, 1 orange and 1 red. I used U571 chapter 15 during the depth charges to set this level, the object is to get the peak of the bass to reach the Orange LED but if the RED LED only blinks that's fine too because that's the clipping point, you do not want the Red LED to remain lit though. You use the amp/processor's LFE level adjuster to set this level and not the sub's volume control. After setting that level you then engage the BFD (turn bypass mode off) and you now have to set integrate your sub with the mains as you would normally but now you can only use the sub's volume control.

    I'll certainly try and reposition the BFD now after that tip, thanks for that.

    Regarding the graph, if you have a copy of AVIA you can also try the sub sweep from 100-20Hz as it's counted down onscreen, just measure the output and curb any peaks, I could of easily done that and got the same results because when I turned the BFD off I got the same peaks as the graph showed and I knew exactly what frequencies were causing them :clap:

    Does the blu-tac suggestion mean you too don't like my beautiful bathroom mat idea :laugh:

    I used the Radio Shack Digital SPL, if you download that Excell program you will see some tables to the left of the graph, as you fill in the figures that the SPL shows the innacuracy of the SPL is taken into account and the figures to the right are the recalculated figures which go on the graph.

    As a former owner of a watercooled PC I know exactly what you mean, god only knows why the 6.3mm adaptors came in an L shape :rolleyes: ............love these new smilies :smashin:

    I did yesterday, it was a training day at work and we were allowed to go home at 12:30pm, here's to more training days I say :lesson: :)

    Phew, Spanish Inquisition over with :devil:

    Phil
     
  18. Paden

    Paden
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    Thanks for clearing that up Phil :smashin:

    I'll definitely be getting myself one of these!
    :clap: to the person who first thought of hooking one up to their sub!

    Cheers, Paul
     
  19. Paden

    Paden
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    I got my BFD & here the result of my efforts (after a little more than 20 minutes :D )

    [​IMG]

    Bit of a difference :clap:
    Previously when I'd set my sub to output 75dB's all but 50hz was way down!
    My main speakers also follow a similar curve, so I've upped the crossover frequency of my amp to 100Hz to minimise these.

    The couple of films I've had time to experiment with have been a lot of fun to listen to & had my trousers flapping nicely :rotfl:
    Bass is far more extended & appears tighter.

    Thanks for your review Phil & the links you provided :smashin:

    Cheers, Paul
     
  20. Apocalypse

    Apocalypse
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    Glad to hear about your results m8, I see you tamed those peaks nicely :clap:

    I'm so chuffed about my results that I no longer think about room treatments now, to anyone reading this (especially those with small rooms) this piece of equipment is the answer to all your sub irregularities.

    Phil
     
  21. NicolasB

    NicolasB
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    My I suggest that this sort of sentiment would be better expressed in the "Adult DVD" forum?
     
  22. Apocalypse

    Apocalypse
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    LOL, damn I'm normally the first person to latch onto innuendo, nice one Nic :smashin:
     
  23. mjn

    mjn
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    shouldn't it be FBD, as in FeedBack Destroyer?
    Rather than BFD? :)
     
  24. Apocalypse

    Apocalypse
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    Behringer Feedback Destroyer = BFD

    As FHM would say "That's £20 you owe us" :smoke:
     
  25. Paden

    Paden
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    Agree with you there Phil.

    I'd initially thought my mains supply was the cause of my troubles & had considered mains conditioners 3x the cost of a BFD!
    Room acoustics are a funny thing.
    I'd moved my main speakers & sub all over the room & the resulting curves weren't much different.
    I guess it's just a problem with the shape of my room.

    Anyway, sorted now!

    Cheers, Paul
     
  26. lmccauley

    lmccauley
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    Oh no, I'm now tempted to get a servo 15 & BFD..

    Must resist :mad:
     
  27. groundy

    groundy
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    Go on, treat yourself - you know you deserve it ;).
     
  28. rigman

    rigman
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    Great review Phil.

    I Currently working away but as soon as I get home I will be spending a bit of time measuring my room response and depending on the results of the peaks and troughs I will get one

    I also have the HGS18 and my room is 18' x 9'.

    I had never heard of this bit of kit before so thanks for the education. May even get one for my hifi which has two Rel storms.

    cheers
    Darren
     
  29. Apocalypse

    Apocalypse
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    Thanks for the compliments Darren.

    People (I was one of em) may think that an HGS18 shouldn't be getting any unruly bass, it's important to distinguish the difference between the sub's output and the room's effect on it. The BFD quite effectively takes the room effects out of the equation leaving the HGS18 to do what it does best which is to go very low and very clean.

    Movies are an absolute dream now but music is even more impressive now, the taming of the peaks has definitely had a better effect on music than on movies. The solidity of the music is stunning now yet the HGS18 dissapears into the overall sound, if you close your eyes you wouldn't know where it was.

    Darren - Ken Bruce did a review of the BFD for use with 2 subs, you might like his points of view : http://www.snapbug.ws/brucekreviewofbfd.htm

    Phil
     
  30. Godfather

    Godfather
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    I've just placed an order for a BFD after reading your excellent review. Can't wait to link it up to my CHT-15. I haven't done a proper graph yet but a quick frequency sweep shows at least a couple of major peaks so hopefully I'll get some improvement from this little gizmo.

    Would someone be kind enough to burn me a CD with the sine waves I need to save me the trouble of downloading them one by one on my sluggish dial-up connection? I'll pay for all costs of course. Many thanks!
     

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