rdale

Wammer
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About rdale

  • Rank
    Wammer

Personal Info

  • Location
    Gran Canaria, Spain
  • Real Name
    Richard Dale

Wigwam Info

  • Turn Table
    Gyrodek
  • Tone Arm & Cartridge
    SME V/Ort. 2M Black
  • SUT / Phono Stage
    Puresound P10
  • Digital Source 1
    Chord 2Qute
  • DAC
    Chord Hugo
  • Integrated Amp
    Glow Amp One
  • My Speakers
    Klipsch RP600M
  • Headphones
    Audeze LCD-3
  • Trade Status
    I am not in the Hi-Fi trade

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  1. Bass frequency sound is certainly reflected off walls and the standing waves created by these reflections cause room modes. But sound behaves differently below the Schroeder frequency and it doesn’t make sense to talk about diffusing sound waves below the Schroedinger frequency whose wavelength is in the order of the room dimensions, because the diffuser would need to be much bigger than the room.
  2. There is no such thing as a ‘bass diffuser’. You can’t scatter bass frequencies because they are omnidirectional.
  3. I’ve got a pair of LS50 wirelesses and a R400b sub. I have a USB hard drive with Apple Lossless music tracks attached to a Linksys WRT1900AC router running OpenWRT with MiniDLNA that communicates with the KEFs via WiFi. The music is controlled via BubblePnP running on my Android phone, and that is my entire system. Everything. I don’t know about its ‘topology’ but it has to be one of the most integrated, best value systems you can get. I’ve spent as much on acoustic treatment as the HiFi, which puts further distance between the approach of a system like this and normal HiFi priorities.
  4. rdale

    measurements - do they really matter that much ?

    The sound reflected off the rear wall will take longer to arrive than the sound reflected via the shortest paths off the side walls and ceiling, which is why it isn’t normally called an early or first reflection point. The main thing about sound reflected off the side walls is that it affects stereo imagery, and absorption panels in the right place improve imagery. I find diffusers like the Vicoustic DC2 in the center behind the speakers help with focus and resolution, and provide the best bang for the buck in conjunction with panels at the side. There’s nothing wrong with panels on the rear wall having said all that.
  5. rdale

    measurements - do they really matter that much ?

    The first reflection points are on the side walls, and so putting panels on the rear walls is the wrong place. Acoustic panels aren’t all absorbers - Vicoustic make the DC2 Multifuser which is an excellent 2d diffuser and works best on the front and rear walls. An acoustically treated room ‘sounds like a room’ if you use the correct combination of absorbers and diffusers as it won’t be dead sounding, just more transparent and accurate.
  6. rdale

    Subwoofer Integration with a miniDSP 2x4 HD

    Ah sorry - I misread you post and had thought you weren’t eq’ing the main speakers. Still an impressively flat in room response.
  7. rdale

    Subwoofer Integration with a miniDSP 2x4 HD

    Interesting post! I am looking forward to doing a similar setup with a miniDSP and a couple of subs in my system. I was interested to see from the graphs that the peaks in the main speakers bass response between 30-50 Hz have been tamed even though you were only eq'ing the subwoofer. That is just what I'm hoping will happen with my system which has a peak between 40-50 Hz that I'd like to tame in a similar manner. Everything I've read says the effect is improved with at least two subwoofers too.
  8. rdale

    Measuring the Effect of Extra Bass Traps

    Only one microphone position - at the listening position roughly between where my ears would go. The mic was always in that same position. Maybe the next time I should take some more measurements in other positions to get an average.
  9. rdale

    Measuring the Effect of Extra Bass Traps

    The tests in the article seemed to show an improvement, but the traps are really ugly - it's one thing to buy the rockwool and another to actually make it into an attractive looking panel. I think a 30cm deep x 30cm wide would have been better than 15cm deep x 60 cm wide in the corners, or better still a triangular shape. After more experiments I ended up putting my cylindrical bass traps horizontally on the floor/wall boundary instead of vertically, which worked well in conjunction with moving my speakers back 15 cm.
  10. rdale

    Measuring the Effect of Extra Bass Traps

    I can't say I've heard of those before. I think they are a bit too big and expensive. I have an old Mana rack to the side of my equipment stand and the right sub woofer really needs to be able to fit under that, otherwise I'll have to start rearranging everything. I'll probably get the miniDSP 2x4 HD and newer Tisbury preamp first. I've just noticed the Cranage Hall show is on at the end of June and I'll be in the UK then. Maybe there will be some subs there to listen to and discuss with the dealers.
  11. rdale

    Measuring the Effect of Extra Bass Traps

    There isn't much HiFi in Gran Canaria and so buying and selling second hand subwoofers isn't really possible. Any subwoofers I buy, I will keep. I'm mainly thinking of REL T0s or T5is as that is a conservative choice and would probably have better resale value than the lesser known sort that you recommended the other day. Richer Sounds were doing the REL T0 for 50 pounds off, and the T5i for 100 pounds off, and I was about to pull the trigger on two T5is and one T0, but the offer stopped the day before I tried to order and I just missed it. I agree it is a bit of a concern that I could take a system that I am actually perfectly happy with, spend a lot of money and then make it worse. But playing with DSP room correction just sounds like a lot of fun, and I don't think I can resist having a play. On studio sound forums from discussions I've read, it seems to be a pretty normal thing to do, just not so common in HiFi circles.
  12. rdale

    Measuring the Effect of Extra Bass Traps

    I think the reverberation at 45-50 Hz is caused by the hallway in the left corner of the room by the left speaker. To me the plots show a worthwhile improvement in flattening the reverberation peak between 45-50 Hz which is what I was hoping they might do. The extra bass traps have had virtually no effect on the in room frequency response though and I'm hoping the subwoofers + DSP might be able to flatten it.
  13. rdale

    Measuring the Effect of Extra Bass Traps

    Yes I agree. But the miniDSP would not have been able to sort out the bass reverberation peak at 40-50 Hz in the waterfall graph, it would only be able to correct the frequency response as far as I know. But my 72 euros worth of acoustic foam bass traps have had an important and measurable effect at 45 Hz. So in contrast to what you say, it isn't that difficult to treat low bass passively. But I don't think it is one or the other, you need both room treatment and bass DSP to get the best bass sound.
  14. rdale

    Measuring the Effect of Extra Bass Traps

    Yes, I've been reading about the miniDSP 2x4 HD capabilities and it sounds very powerful. The interesting question to me is whether or not it makes more sense to spend 700 pounds on a standmount speaker + 1300 pounds on subwoofers and miniDSP vs spending 2000 pounds on a pair of floorstanders.
  15. rdale

    Measuring the Effect of Extra Bass Traps

    Yes, you're right - I suppose I should have said 'reduce the reverberation peak' - that was that thing that had bugged me when I took the original measurements. When I get a miniDSP 2x4 HD and a couple of subwoofers I hope I'll be able to flatten out the frequency response a bit as well as extending the bass.