Your Home Theater ULF Score - Page 92 - AVS Forum
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post #2731 of 2744 Old 11-22-2014, 02:10 PM
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So last night I took my new Reaction Audio CX-15's over to a local forum members place so that he could audition them, he has dual Mirage BPS-400 sealed dual opposed subs in his room on a suspended floor. Not keep in mind these subs basically don't really do anything below 20hz and actually roll off pretty fast as 30hz. But holy crap I wish I had a suspended floor!!!!....LOL


Now I understand what guys are talking about, I mean with my four monster ported subs you could get tactical feel from them but you would need to have them at some pretty insane levels. Then they would shake everything in the room. But I was amazed at how easily you could get tactical feeling and at such low levels. Makes me wish I could build my dream theatre room on a suspended floor!
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post #2732 of 2744 Old 11-22-2014, 02:26 PM
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Quote:
Originally Posted by jbrown15 View Post
So last night I took my new Reaction Audio CX-15's over to a local forum members place so that he could audition them, he has dual Mirage BPS-400 sealed dual opposed subs in his room on a suspended floor. Not keep in mind these subs basically don't really do anything below 20hz and actually roll off pretty fast as 30hz. But holy crap I wish I had a suspended floor!!!!....LOL


Now I understand what guys are talking about, I mean with my four monster ported subs you could get tactical feel from them but you would need to have them at some pretty insane levels. Then they would shake everything in the room. But I was amazed at how easily you could get tactical feeling and at such low levels. Makes me wish I could build my dream theatre room on a suspended floor!
Can't you just build a platform to put your seating on? I assumed the bass would shake the platform much like it would a suspended floor. My house was built in 1928, and I have wood floors. Everything shakes and rumbles. I'll have to give that vibration app a whirl one of these days.

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post #2733 of 2744 Old 11-22-2014, 02:42 PM
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It still will not be the same with a platform. Last night I went up stairs and notice much more vibration/shake with the furniture due to the suspended wood flooring. If I could put my subs upstairs, I think I could tear up the the rooms, lol.

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post #2734 of 2744 Old 11-22-2014, 02:43 PM
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Co-axial to RCA connection problem

Hey guys,
I have two coax cables running to my subwoofer from an AV Rack. I terminated the cable with RCA compression fittings. It seems I properly connecting the fittings (peeling back the shielding, etc.). Both cables either don't work or only work intermittently. It's not the sub, as I just replaced with a new sub. Any thoughts?! Thanks in advance.
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post #2735 of 2744 Old 11-22-2014, 02:46 PM
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Quote:
Originally Posted by bear123 View Post
Can't you just build a platform to put your seating on? I assumed the bass would shake the platform much like it would a suspended floor. My house was built in 1928, and I have wood floors. Everything shakes and rumbles. I'll have to give that vibration app a whirl one of these days.
Wouldn't be the same and no in my room that wouldn't work out to well, plus the ceiling height in my HT room is only 7'10" high.
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post #2736 of 2744 Old 11-22-2014, 03:09 PM
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Originally Posted by jbrown15 View Post
Wouldn't be the same and no in my room that wouldn't work out to well, plus the ceiling height in my HT room is only 7'10" high.
Hmm, wonder if 2x2's for a base with plywood would help and maintain most of your ceiling height? You would only lose 2-3". Just a thought.

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post #2737 of 2744 Old 11-22-2014, 03:11 PM
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Quote:
Originally Posted by bear123 View Post
Can't you just build a platform to put your seating on? I assumed the bass would shake the platform much like it would a suspended floor. My house was built in 1928, and I have wood floors. Everything shakes and rumbles. I'll have to give that vibration app a whirl one of these days.
This is why many of us with carpet over concrete build platforms built to flex and use transducers of some sort (I use BKs). It is a night/day difference in floor movement sensation vs just having seating on the carpet over concrete and might be THE best single upgrade I have ever done to my HT for audio or video.

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Originally Posted by jbrown15 View Post
Wouldn't be the same and no in my room that wouldn't work out to well, plus the ceiling height in my HT room is only 7'10" high.
My platform doesn't sit more than 3" off the ground with the kinetic rubber isolator feet. Even if you needed some 2x4s for more support (I did not even need to do this with my single couch), it wouldn't add much height and be well worth it!

I just need to figure out some sort of EQ that will allow me to reduce below ~15hz to keep my BKs from bottoming on those BIG ULF hits. I don't want to just turn down the overall level as I like my above 20hz right where it's at, so I just need to get some sort of simple (hopefully) EQ to reduce below 15 hz or so a bit.

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Last edited by Toe; 11-22-2014 at 03:15 PM.
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post #2738 of 2744 Old 11-22-2014, 06:26 PM
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Quote:
Originally Posted by bear123 View Post
Hmm, wonder if 2x2's for a base with plywood would help and maintain most of your ceiling height? You would only lose 2-3". Just a thought.

I think part of it would have to do with the subs being coupled to the same floor your seats are on. I say that because my rear riser doesn't really feel any different then my front row. Plus that's not really a "suspended" floor, which is partly some of the effect.
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post #2739 of 2744 Old 11-22-2014, 08:18 PM
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I have wondered if the Isolator for the furniture feet wood make a difference. Transducers are the easy answer with the HT in the basement. You would have to buy 3or 4 subs to do the same thing.

Klipsch RF 7 based HT 7.4, Pioneer SC 35, Acurus 200 Five, Dayton 18 Ultimxa Dual Sub Cab(2), Dayton 18 Ultimax Large Vented Sub Cab (2), on Berhinger I Nuke DPS amps, Samsung BDP F 7500, Asus/My Book Live HPC 4 TB

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post #2740 of 2744 Old Yesterday, 06:12 AM - Thread Starter
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Quote:
Originally Posted by dominguez1 View Post
derrickdj1 recently connected 4 Aura Pro tranducers to his main LP. He then measured the amount of Vibration produced with the Vibration Meter app (Android) starting from 10hz to 50hz. His main volume was at -5.

Here is the Vibration Meter scale (left Roman Numerals):



Here is derrickdj1's 4 aura's response (subs off)



Subjectively, 3 is somewhat noticeable on this scale, and 4 is definitely noticeable. Once in the 5 and above range, it starts to get pretty silly (e.g. feels like your couch is possessed!).

According to his results, he starts getting significant shake from these Aura's at 13hz! It continues on and peaks at 16hz to 40hz. That's actually pretty incredible! Perhaps it's because you have all 4 hooked up at your MLP?

derrickdj1, did you calibrate this as instructed below?

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Make sure your phone does not have a case and is on a flat surface. Run the app and tap just right below the graph so it does not reset the meter. The tap should be just a normal tap; not too hard and not to soft. When I do this, I typically register from .75 to 1.25 on the scale. Adjust your calibration so that when you tap, it is generally in that range. Hopefully that will sort of calibrate our systems and you can remeasure
@derrickdj1 , did you calibrate your android for the test?

4 of these runs $160. It would be interesting to see how some of the more expensive transducers around this price range compare: 2 buttkicker minis or Clark synthesis silver...
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post #2741 of 2744 Old Yesterday, 01:03 PM
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Yes, the meter was calibrated as instructed. I have six of the transducers evenly spaced in the large sectional couch. The graph shows a dip at 23 Hz which is an area that the subs need a slight boost. This looks like a mean vibration score? I should also mention that the sectional is wood frame. The shakers are ran off a Berhinger I Nuke 3000 DSP amp.

It would have been interesting to see the sub FR graph included with the vibration meter results. I can say that in a movie the transducers dominate the tactile feel since it is a direct effect.

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Last edited by derrickdj1; Yesterday at 01:08 PM.
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post #2742 of 2744 Old Yesterday, 04:19 PM - Thread Starter
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I'll try and overlay your Sub FR.

So, how many transducers were attached to your main LP section? 4?
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post #2743 of 2744 Old Yesterday, 04:31 PM
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I have 6 of those transducers but I don't use them anymore.
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post #2744 of 2744 Old Yesterday, 04:38 PM
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The way the transducers are spaced, maybe 1 1/2.. The MLP was not given special consideration over the other seats since I want everyone to have a similar experience. The middle and the ends of the sectional are all pretty equal. The shakers are a little over a foot apart from each other. I think the same principles apply to these as subs. There may be some room gain involved. The type of furniture that they are hooked up to has a lot to do with how well they work. I am not sure if the sectional was a heavy steel framed unit the effects would be the same.

Maybe someone can critique my FR of the subs, lol.

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Last edited by derrickdj1; Yesterday at 04:42 PM.
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