#1
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Treatment behind dipoles
Up until last weekend, i was living by the idea that my Betas should have a flat untreated wall behind the upper panels since they are dipoles. Even stating in a recent thread.
Then i read in another venue that some have successfully used QRD panels behind them. I had already started thinking that depth of staging front to back was lacking in my system. From my GIK kit purchased earlier this year, i have two 'Monsters' on stands that have behind my listening position. However, my Monsters have the 'scatter plate' option and, jumping to the chase, I put them directly behind my upper panels and am now swimming in depth. Further, my lower region has taken another step towards greatness. Now I am on the hunt for QRD panels as I am guessing the effect I am hearing is mainly from the scattering. Does this make any sense?
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Main Equipment: Kharma Elegance dB11-S, JL Audio F113v2 X 2, Block Audio Line & Mono SE Amplification, Bricasti M21 DAC, Antipodes Kala K-50 Server, Clearaudio Performance SE. Satisfy tonearm & Maestro Wood MM cartridge. Power: Shunyata Everest 8000, Sigma XC v2, Sigma NR v2, Block Audio PCs, Defender, ADDPowr Wizard Grounding: Shunyata Altaira CGS - 4 X Alpha CGS cables, Network : Supra Cat 8+, Twin (Nenon) Modified Buffalo GS2016 Switches, Keces P3 LPSU, Cables: Wireworld Platinum 8 USB, Wireworld Platinum 8 Speaker cables, 6M & 1M Tubulus Concentus ICs, Other:Two PSI Audio AVAA C20, Multiple GIK products, Stillpoint Apertures, Stillpoint Minis and Ultra SS, Three 20 Amp lines, Furutech GTX - Gold outlets, Adona Rack |
#2
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It makes sense to me. When I had a dedicated room now devoted to other uses, I initially had forward-radiating Symdex Epsilons out about five feet from the front wall, with Tube Traps set in the front corners and center. In that setup, everything sounded best with the traps oriented with their wholly absorptive sides facing outward.
When I replaced the Symdexes with Maggie 1.6QR's, I found that orienting the traps with their reflective membranes facing outward--they still also absorb in that configuration--rendered the best sonic presentation. Though the designs are different, I suspect that the scatter-plated Monsters would give similar results. And that QRD's in place of them back there would be the logical next step.
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Jim Bedroom: Aurender N150-->Bryston BDA-3-->EMIA Elmaformer Cu passive line stage-->conrad-johnson MF2500-->Paradigm Studio 20 v.5 Wireworld Eclipse IC and SC Shunyata Delta D6, Alpha XC, Delta NR v.2, Alpha USB; Altaira CG Hub Stillpoints Aperture II; Ultra SS; Ultra Mini GIK Monster; 242 Butcher Block Acoustics Maple Platforms |
#3
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Diffusion of sorts behind dipoles is fine. I think absorption behind a dipole makes it more dead like a cone. It depends on how you like it.
The wall behind my speakers is a rock wall (real, large rocks, not thin flat veneer rocks) that act as hard irregular diffusers except the area behind the power amps and crossover where I boarded up the fireplace, which is 1.5 inches thick of flat oak. There was a noticeable difference (I don't want to say improvement because there is personal preference here) when I boarded up the fireplace, which has not been used in the last 20 plus years. Who needs the smell and soot anyway. Last edited by GaryProtein; 12-03-2014 at 10:53 PM. |
#4
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Quote:
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Glenn Kuras GIK Acoustics US - http://www.gikacoustics.com Europe - http://www.gikacoustics.co.uk |
#5
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Quote:
Wont I lose that bas definition if I replace the monster/scatter with the Q7d?
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Main Equipment: Kharma Elegance dB11-S, JL Audio F113v2 X 2, Block Audio Line & Mono SE Amplification, Bricasti M21 DAC, Antipodes Kala K-50 Server, Clearaudio Performance SE. Satisfy tonearm & Maestro Wood MM cartridge. Power: Shunyata Everest 8000, Sigma XC v2, Sigma NR v2, Block Audio PCs, Defender, ADDPowr Wizard Grounding: Shunyata Altaira CGS - 4 X Alpha CGS cables, Network : Supra Cat 8+, Twin (Nenon) Modified Buffalo GS2016 Switches, Keces P3 LPSU, Cables: Wireworld Platinum 8 USB, Wireworld Platinum 8 Speaker cables, 6M & 1M Tubulus Concentus ICs, Other:Two PSI Audio AVAA C20, Multiple GIK products, Stillpoint Apertures, Stillpoint Minis and Ultra SS, Three 20 Amp lines, Furutech GTX - Gold outlets, Adona Rack |
#6
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You may, yes. Basically the Monster is helping in the low end with SBIR (Speaker Boundary Interference Response SBIR GIK Acoustics), while the Scatter Plate is helping in the upper frequency by spreading out the image from the rear of the speakers. Both problems that it is helping are due to the speakers being too close to the wall. The diffusors spread out the sound that come from the rear of speakers to create a more cohesive "image" instead of sounding like distinct reflections (as if there were some quieter speakers further forward that were phasing with yours). Even if your speakers are far from the front wall, diffusion can still help further spread that image. Note that the Monsters are also helpful in just absorbing bass as well, but the effect on SBIR is probably gave them a pronounced effect when moving them. Depending on your room size/shape you could do diffusors to the sides of the Monsters up there.
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Mike Major Educator / Designer GIK Acoustics USA | (770) 986 2789 GIK Acoustics Europe | +44 (0) 20 7558 8976 (UK) |
#7
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Alex, Thank you for the continuing education. Craig
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Main Equipment: Kharma Elegance dB11-S, JL Audio F113v2 X 2, Block Audio Line & Mono SE Amplification, Bricasti M21 DAC, Antipodes Kala K-50 Server, Clearaudio Performance SE. Satisfy tonearm & Maestro Wood MM cartridge. Power: Shunyata Everest 8000, Sigma XC v2, Sigma NR v2, Block Audio PCs, Defender, ADDPowr Wizard Grounding: Shunyata Altaira CGS - 4 X Alpha CGS cables, Network : Supra Cat 8+, Twin (Nenon) Modified Buffalo GS2016 Switches, Keces P3 LPSU, Cables: Wireworld Platinum 8 USB, Wireworld Platinum 8 Speaker cables, 6M & 1M Tubulus Concentus ICs, Other:Two PSI Audio AVAA C20, Multiple GIK products, Stillpoint Apertures, Stillpoint Minis and Ultra SS, Three 20 Amp lines, Furutech GTX - Gold outlets, Adona Rack |
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