Acoustics is fascinating stuff, be it for hearing music in the correct way (ie, flat frequency response) or to the contrary, to stop hearing things. I have done a lot of reading. I can grasp how to do sound proofing. But in-room acoustics is, up to a degree, an altogether voodoo type of thing...
Best and most cost effective way for sound proofing is building a box inside the "CMU" box with a double layer of drywall with GreenGlue in between. The drywall should be on a frame of its own and this frame sould be as decoupled as possible and filled with low density (cheapest) fiberglass.
This is a sound proofing sollution, however it is also kinda bass trap. The low frequency's will not reflect on drywall like high frequency's do, but they will pass trough it. In part, they will be absorbed by the cavity and fiberglass. The rest will be reflected by the CMU and come back into the space. Medium frequency's will be absorbed by the double drywall with GreenGlue!
Definetely avoid triple leaf construction, which to my surprise even Harman Kardon failed to do when making their "reference listening rooms" around the world. But maybe they weren't concerned about sound proofing.
BTW GreenGlue is now also Belgian owned (by Saint Gobain, known for their glass and also owner of Gyproc, the best known drywall sheets over here)
When my box in box is done, an acoustic is going to come over for measurements and advise and design proper treatments for me to make or buy. Then he measures a second time and advise fine tuning. All this for the price of a XSP-1. Without materials ofcourse.
Any chance I can get you to compare the XPR-1's to the XPR-5??
Actually, I did listen to just the XPR-5 for a few days before the 1s showed up. I must say, the 5 is very impressive! I didn't exactly do some critical A/B listening, but off the cuff I would say that the XPR-5 is very tight. It's closer to a digital sound than the XPR-1. The 1 is warmer, and I definitely noticed a more expressive, deeper sound stage.
But the XPR-5 is a fantastic unit all by itself.
Something interesting... the evolution of the packaging. The XPR-5 came with random bits bits of foam around it. The XPR-1s came packed in custom-molded styrofoam complete with Emotiva logo embossment and stenciled fabric cover (no cover on the 5).
Voodoo is SO accurate, yes! I wish I could go that far with my space, but I have too many limitations, alas. I'll take it as far as I can, though, and let room correction make up for the rest.
Thank you for passing along the links and the suggestions!! Mainly, I never bothered with an acoustician since I doubted I could afford one. But you certainly seem to be saying they are more reasonable that I'd imagined. I have a link to a good one via my architect, but I never followed up due to my assumptions of cost. But I will definitely re-engage him on that.
XPR-1, XPR-5, XPR-1
Mac mini w/ Channel D Pure Music playing via XMC-1 USB DAC
Martin Logan Montis
Martin Logan Stage
Martin Logan EFX
2x JL Audio Fathom or ML Depth
Hey Riscy, they changed the board on the xpr's lights to make them more responsive than the xpa's. At last years emofest they had a prototype xpr that had square lights and it was really sensitive to the input. It looked really cool I wish they would have went with that set up. By the way I showed my wife your setup and she said " Oh I like those speakers, you should get some of those"
riscy, were you having any issues with the Denon shutting off or clipping? I have a Denon 3313 currently and Theos on the way. I would like to go a few months without having to buy amps if I could, but not if the speakers and Denon may be damaged by the low impedance...
Post by The Mad Norseman on Mar 17, 2013 16:32:55 GMT -5
riscy typed (in part) referring to your new HT build-out: "The floor is vinyl wood planks over the concrete foundation".
Not sure exactly what that means, but if you're putting everything in new, then now's the time to lay down a wood 'sleeper floor' atop that bass-killing concrete! What works really well is laying 2" x 4"s on their sides 16" apart, and cover that with two layers of 5/8" ply that are run opposite of each other for random overlap (be sure to put a layer of rosin paper between the two ply sheets or you'll get squeaking!). Then carpet, and a carpet pad atop that. You'll get superb bass this way! A great side benefit to this kind of floor is that it's also a built in/ready-made cable chase!