air gap or not?

Hi,

I have a dedicated listening room being built in my new house.

The outer walls are concrete block with pour concrete centers and the 4"x2" framing is not attached to the concrete wall. There is a 1" gap between each thus giving me a 5" catvity to stuff with mineral wool.

My question is: Should I use 4" deep mineral wool (therefore leaving a 1" air gap) or use say 2" mineral wool giving me a much larger air gap and maybe increasing absorbtion.

Any help apprecicated.

Thanks,

Peter

Recording of August 2008: Romaria

Recording of August 2008: Romaria

<B>THE DOWLAND PROJECT: <I>Romaria</I></B><BR>
The Dowland Project: John Potter, tenor; John Surman, tenor &amp; bass recorder. soprano saxophone, bass clarinet; Milos Valent, violin, viola; John Stubbs, baroque guitar, vihuela<BR>
ECM New Series 1970 (CD). 2008. Manfred Eicher, prod.; Markus Heiland, eng.
DDD. TT: 77:00<BR>
Performance ***&#189;<BR>
Sonics ****

Maybe I'm a tube guy after all...

I've been doing a lot of system shifting the last few months. Everything but the speakers. Ditched half of the 70's Harmon/Kardon integrated, got an early 90s Rotel power amp. That got me much more focused sound, and made me realize that my speakers are actually pretty damn good. (In keeping with my ultra-cheap philosophy, born of massive student loan debt, a mortgage, and two small children, they're Dynaco A-25s, modded with new tweeters and a rebuilt crossover. I swear that I haven't heard anything at a store that costs less than $1k that touches them.

Krell Evolution 505

Two questions regarding the Krell:

1) On p. 91, Fred Kaplan describes the Krell as employing, "The Burr-Brown PCM1738 DACs, each capable of handling 24bit data...." As we know well, SACD employs DSD, which is a 1-bit codex. Does this mean that the Krell doesn't decode DSD but rather converts it to 24bit PCM data first? This would seem strange for a $10,000 player (it is one thing for the cheep OPPO).

John Mellancamp - Life, Death, Love and Freedom

Some musical goodness here. Its a T Bone Burnet production, and does share some of the sonics of the Plant/Kraus "Raising Sand" but to my ears, this one sounds better.

The subject matter is pretty somber, and the title does a good job of foreshadowing the lyrical content, but the real story is that this title is sold in a 2 disc set. Disc 1 is standard redbook, Disc 2 is a DVD. And on the DVD you get a hi-rez 24/96 version.

Advertisement
Advertisement
Advertisement