Recent content by DonH57

Your HVAC company, or the local building code office, can tell you the area of air ducting required for your furnace. To me four louvered doors sounds like overkill. And all this assumes gas, not electric, furnace and hot water heater.

Adding a door to the upstairs would help; use an exterior (heavy solid-core) door with weather seals to block the most sound. It might be easier to put it at the top of the stairs than the bottom. One thing I have done that helps is to put up a shower (spring-loaded) curtain bar at the entrance...

Thanks! I'm not sure I would say "no" leakage but almost none (I'm an engineer so tend to shy from absolutes). I'd have to dig for the SPL measurements I took, but I only have a C-weighted SPL meter so falls off below 30 Hz, and I am not sure I ever did broadband measurements (using my...

A diagram would really help, showing stairs, doors, and other features including location of your mechanical room. Isolation is a different (and usually much bigger) problem than controlling reflections using acoustic panels. The panels can help with higher-frequency sounds, but even then as...

Very large absorption panels can help, but the usual solutions to room modes are to (1) move the listening position; (2) add subwoofers to counter the nulls at the listening position; and/or, (3) change the room. I added subwoofers to smooth the bass in my media room since four small subs...

Enter me to Win

Agree that posts tend to be negative as that's what gets people riled up enough to post (case in point...) Can't ascribe it just to Christmas as that was the third time in the past 18 months or so and was at various times through the year. Each time was several emails/contact posts over 30~60...

Not recently, on my list, some other Life things came up. I think JBL lost their key guy for SDP/Trinnov product support so the only way is to contact your dealer and have him advocate to JBL for you. That usually works though did not last time; it was a couple of weeks before Christmas, not...

I have been unable to get support like HW/SW updates for my SDP-75 for over two years now. Emails and contact forms simply go unanswered. It took a dealer's intervention and escalation to get my last update and that was nearly three years ago. I'd be very hesitant to buy electronics (at least)...

I like Ralph a lot and we interact on several forums. I am not sure that article is relevant for this thread, however, as the Outlaw amplifiers and AVR in question are designed as voltage sources, and speakers mentioned are designed to be driven by voltage sources, as are most consumer amps and...

I'd leave it the way it is. The Outlaws have more power and as separate amps do not share power supplies so using them to drive the front three, which generally consume the most power and deliver the most sound, makes sense to me. Bi-amping with an AVR provides essentially no power benefit...

Four Rythmik F12s in a 13'3" x 17'7" room with one irregular (angled) wall controlled by a JBL SDP-75 (Trinnov Altitude 32 with JBL tweaks and badging). Four subs to help smooth the frequency response; output is more than enough. REW says -3 dB around 7 Hz though have a couple of nulls I could...

Awful news, very sorry for John's loss!

Nice cables, decent price for an active cable.

I would guess the amp will go before the speaker... The reason boosting a true null is a bad idea is that it is caused by the direct sound, D, being cancelled by the reflected sound, R, so you get D - R = 0. If you amplify by 10, it also amplifies the reflected power, so 10D - 10R = 0 (still)...