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Help me with Velodyne CHT15

Discussion in 'Subwoofers' started by petrolhead, Apr 27, 2003.

  1. petrolhead

    petrolhead
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    Very tempted to buy one of these.

    Currently run a Rel Strata III but have the upgrade bug.

    Looking for lower, tighter bass. (Trouser Flapping :) )

    Room size is 12" x 13"

    Running Kefs

    Some one has suggested it may be too big for the room.

    Of the guys here who won one what is your room size?
     
  2. paulfd

    paulfd
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    Hi m8,

    My room is slightly larger than yours but mine's ok (16 x 14). Volume set to 3.5 ish on the sub amp and it just delivers. :)

    The only thing is that whilst a box at 2' x 2' x 2' doesn't sound too big, it does require floor space. A 6 cubic feet box is not small.
     
  3. rjw

    rjw
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    My room is almost identical in size to yours, no problems with my CHT-15.
     
  4. Godfather

    Godfather
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    My CHT-15 sounds great in my room measuring 16x9' (matches my widescreen TV!). I don't think it's too big.
     
  5. petrolhead

    petrolhead
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    Cheers for the support guys.

    Godfather I notice you have a BFD, has it helped. Spoke to Steve.Ex last night and he sung its praises.
     
  6. Godfather

    Godfather
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    To say it's helped a lot would be an understatement. It's one of the most cost effective upgrade I've ever come across. I'd go so far as saying that an equalized CHT-15 would probably sound better than an unequalized HGS. I'm no expert but the effect of the room on bass frequencies is huge. That's where the BFD comes in. By filtering out unpleasant room-induced peaks, it removes any traces of boom resulting in much 'cleaner' bass. Room treatment would be an alternative but is not really a feasible option in most people's homes.

    So big thanks to Apocalypse for introducing me to the BFD!
     
  7. codling

    codling
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    got me one coming monday/tuesday.

    i've ran the sinwave test and used the spead sheet on exel(thanks apocolyse,great review/links page),

    ive got a 10db peak at 36hz,10bd drop at 56hz and another 9db peak at a 100hz.
    so cant wait to see what this baby can do,for £100 this sounds a steal.

    carl
    :)
     
  8. lynx

    lynx
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    It's 6ft³ :D
     
  9. petrolhead

    petrolhead
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  10. paulfd

    paulfd
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    :rotfl: :rotfl: :rotfl:
     
  11. tk2001

    tk2001
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    Godfather, are you saying that you don't get boomy bass with your CHT-15 & BFD at ALL?
     
  12. Godfather

    Godfather
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    That's right. I don't get boomy bass at all after adding the BFD. It almost sounds too good to be true, but it is. :)

    Before getting a BFD, why don't you use a SPL meter to measure your room response? Then you'll be able to see if there're any nasty peaks that need to be tamed. I can send you a CDR of the test tones if you want.
     
  13. Godfather

    Godfather
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    I just helped my dad set up a REL Q50 in his new flat. Moved the sub around the room but couldn't find a spot where there was no boom. Did some quick measurements with the SPL meter and found a huge peak at 40Hz and a couple of smaller ones at 50Hz and 80Hz. Those were the hot spots causing boom. So I connected up a BFD and here are the results after applying 3 filters:

    [​IMG]

    The difference is instantly audible. No more boom.
     
  14. petrolhead

    petrolhead
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    This seems amazing. I know apoc has a site re seting up but in you opnion is it fairly straight forward
     
  15. Ian J

    Ian J
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    I'm also very tempted
     
  16. Godfather

    Godfather
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    It's fairly straight forward, but does take a few hours before you really get the hang of it. After that it becomes very easy - it took me about half an hour to get the above results with the REL.
     
  17. petrolhead

    petrolhead
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    Well I've ordered the CHT15. Getting delivered on Friday so will take the day off and play

    I hope it's raining :)
     
  18. tk2001

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    Hi Godfather,

    The test tones that you mention, do they differ from the test tones (frequency-sweep from 100Hz to 20Hz) found in Avia?

    BTW, do you have a pic of the BDF amounst your AV set-up and does it look obstrusive?
     
  19. Godfather

    Godfather
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    The test tones I talk about are a set of 21 ten-second sinewaves at frequencies between 16 and 160Hz. I've got them on a 21 track CDR. Basically you play the disc with just the subwoofer connected (or turn off the other speakers on your amp/receiver) and use the SPL to measure the volume of the sub at the above frequencies which are: 16, 18, 20, 22, 25, 28, 32, 36, 40, 45, 50, 56, 63, 71, 80, 89, 100, 111, 125, 143, 160Hz.

    I've tried using AVIA but I find the sweep too fast for taking accurate measurements. As I said, each of the above frequencies plays for 10 seconds so you have plenty of time. I enter the numbers directly into Excel which automatically plots a graph. Have a look on Apocalypse's page for details of where to download the Excel 'program'. The above test tones can also be downloaded.

    I'll take a pic of my setup with my BFD and post it here later.
     
  20. nathan_silly

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    Doesn't the BFD got built-in tones? Also does it have a SPL mic input so it'll run a wizard and sort everything out?
     
  21. Godfather

    Godfather
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    Don't think it has any internal test tones. It does have a mic input and is capable of searching out feedback frequencies and destryoing them, hence the name. :)

    What it won't do is automatically equalize your subwoofer and produce a perfect house curve. You'll have to do that yourself!

    Can't find my camera at the moment but here's a pic of my room with the BFD at the bottom (I know I need a new rack). Will try to take a closeup of the BFD later.

    [​IMG]
     
  22. Godfather

    Godfather
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    Here's a close-up:

    [​IMG]
     
  23. nathan_silly

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    Your system looks weird :)

    I'm used to my poweramps & processor setup.

    Do you have a problem with the Nexus stands? (I find them too light & wobby)
     
  24. Godfather

    Godfather
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    I find them a bit wobbly too but as my speakers aren't that heavy, I guess they're good enough for now. Next time I'll get something really heavy and sturdy.
     
  25. tk2001

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    Godfather, very nice set-up you got there btw.

    I'm trying to attach a graph which contains the frequency response to my CHT-15 but a message comes up with:

    "The image that you have attached is too big. Please make it no bigger than 300 x 300."

    How can it be too big when everyone elses graph is much bigger than mine?
     
  26. JSW

    JSW
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    TK upload your image to an image hosting site and then link to it.
     
  27. petrolhead

    petrolhead
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    Very smart Godfather. Do you not find the sound pans stangely with the ctr being so high.
     
  28. Godfather

    Godfather
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    It's a bit high but it's tilted downwards and I'm sitting about 12 feet away, so I haven't noticed any problems with pans, etc.
     
  29. tk2001

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  30. Godfather

    Godfather
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    That doesn't look too bad. Nothing the BFD can't handle. :)

    I'd use 3 or 4 filters to bring the 30-60Hz section down towards the 90dB line and another filter to tackle that 90Hz spike.

    Did you use this Excel program?

    http://www.snapbug.ws/subtestmodel.xls

    If you enter your figures onto the chart, it'll readjust the values to compensate for the inaccuracies of the Radioshack SPL meter (especially for low dBs). So the curve to the left your 40Hz peak won't be quite as steep as on your graph. I've got your details so I'll send you a CDR of the test tones tomorrow morning.
     

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