Sony VW1000 4k, 13' Scope, and Ten 21 Inch Subs - Page 2

under 100-115k for the LF?



J/K.....

Very nice, ambitious build,.... so far, so good.

Great to see work underway. All of these foundations are just the home theater I hope Ten 21" drivers should be just enough What frequency will you get down to on these?

Additionally, with an approximately 31' longest dimension of your proposed room, the onset of PVG will occur around 17-18hz. It could be one way or the other depending on room appointments, large furniture etc. As you likely know, from that point downward, the acoustic reciprocity characteristic of PVG will yield you somewhere between 6-10db/octave. Depending on the diaphragmatic boundary action of the walls etc., a figure of 9-10db isn't out of the question.

Very interesting build, and I'm especially interested in the audio aspects. Any mains details that you could post, I'd really enjoy reading about. Also, could you elaborate about the LF design? As many details as possible would be fantastic. Alignment, driver type, design config notes, amplification etc.

Thank you and good luck

Thanks for the details, I've got a better idea of what you're doing. I missed the post #9 somehow. "118 db+ at 10hz before EQ", I don't see that being a problem, but I'm not perfectly clear on all details,...it'll be fun to follow along.

With regards to PVG;
Pressure Vessel Gain (PVG) is the scenario whereby the longest dimension of the room can no longer support full propagation of the waveform. At this point, the acoustic propagation transitions to acoustic pressurization. The manner in which the sound is reproduced into the space changes from a normal cyclic propagation, to pressurization because the wavelengths are too big for the space.

The frequency at which this occurs is approximately the point whereby half the wavelength of a given frequency is equal to the rooms longest dimension. So if your room has a longest dimension of around 31 feet, the transition from propagation to pressurization will occur about 17-18hz. This is because a 18hz waveform is 62.7' (1130/18). Half of that is 31.39', so this corresponds to the approximate length of your room. As I stated, this is the point of transition. Any frequency below that point pressurizes the room, and any frequency above that point propagates freely. So in this room that's approximately 31 feet in the longest dimension, from 18hz downward, the room gives back acoustically.

At this frequency, the results are a gain in acoustic pressures in the room that grows as the frequency decreases. This acoustic support reciprocity, is theoretically 12db per octave. The percentage of the 12 db/octave gain one achieves, entirely depends on the integrity of the boundary walls and surfaces. If it was the theoretical concrete bunker, a full 12db/octave boost would occur. Typically, somewhere between 6-10 db octave could result. Also, in addition to the walls and surfaces flexing, other aspects may affect the point at which room gain begins. Furniture, cabinets etc, anything that consumes a certain measure of cubic feet, may slightly alter the transition frequency merely because the items take up space.

It certainly sounds like you're going to put some very nice gear in a very nice room. Good lookin' out.


Thanks for the details and good luck

Not much solid out there on Pressure Vessel Gain, there is however a great deal of mis-information It's one of the very few instances of a "free lunch", with no negative side effects.

What a fantastic opportunity you have crafting a room from the ground up,...literally and figuratively. The room being the single most important aspect, what a great and exciting situation. All the best.


Good luck

Looks like this is going to be a great space. Cant wait to see the drivers when they come in. I'd be interested in seeing the specs on the drivers.

This is incredible. Makes me want to build a house for the wife on a piece of property so I can have my own wing like this!

Are you sure it's not a 9.2 channel receiver? They are becoming more popular. Normally the top end receivers (pioneer/denon et al) are 9.2. (ie nine LCR + surrounds and two sub channels) I really don't see much content that is specifically mixed to 9.2 and from what I understand the AVR will create the extra channels accordingly.

And I would go with the symmetry of cabinet design 1

I like option 1 as well. You can never have too much counter top, after all. Also, can you center the lower cabinets so that you split the blank space on the left between both sides. My OCD wants it to be symmetric .

I like #3

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off topic
I see you using Revit Architecture...Are you an architect? That's the real deal, AFAIK.