Amp Riser Effectiveness

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endorka
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Re: Amp Riser Effectiveness

#31

Postby endorka » Wed, 2019-Nov-27, 16:14

Soundman2020 wrote:
endorka wrote:Cheers Stuart. It's just the camera angle, the riser is about a foot away from the rear wall.


Are you sure? It doesn't look like a foot...


Aha, I see the confusion :-) Fortunately that's a side wall, and it's the bottom of a bass trap angled at 45 degrees from the wall. The riser is a couple of inches away from it. The rear wall is the one with the visible wooden skirting behind the kit. There's usually some bass traps there too, but I moved them out the way for the rehearsal.

That testing machine is impressive, but like you I suspect these cost a small fortune. No fears, I have a contraption in mind to serve in its stead :-)

Cheers,
Jennifer



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endorka
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Amp Riser Effectiveness

#32

Postby endorka » Wed, 2020-Feb-26, 23:04

At last the modular riser is finished!

Here's the 8x6 foot version;
2020-02-26 20.14.26.jpg

Close up detail of the trim and joining bolts;
2020-02-27 00.07.30.jpg

2020-02-27 00.06.59.jpg

As per design the sections can be combined in various combinations to make;
- two 6x4s
- one 6x4, one 4x4 and one 2x4
- one 6x6 and one 2x6

And various other combinations.

The top layer is joined by the cam bolts commonly found on flat pack furniture so assembly and disassembly is easy. The other two layers are joined by 170 x 7mm steel rods in a way that all three layers are connected on most combinations. The joins are very secure, you can walk across the riser no problem at all. Here's a photo of a test fit showing the connections between the three layers;
layer joins.jpg

The modular design is useful for the different recording situations I do with various instruments in the two rooms, and being able split it apart will be essential for some of the studio modifications to come. Saying that, the design and build was an order of magnitude more complex than simply building a single 8x6 foot riser. The many bolt holes had to be drilled to millimeter accuracy, and holes in the trim drilled accordingly. It was worth it, but if you can get away with building the single large version, I'd seriously recommend doing so :-)

Cheers,
Jennifer



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endorka
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Amp Riser Effectiveness

#33

Postby endorka » Wed, 2020-Feb-26, 23:24

The reduction in impact noise to the rooms below and adjacent has to be heard to be believed, it is truly incredible. I'll do some sort of test soon.

In the meantime, the following might be of interest. It's a comparison of the transmission loss to a room below of a bass amp on the 6x6 foot version of the riser versus directly on the floor. Done using REW through the amp. Measurement mic in the room below. The amp was calibrated so that unfiltered pink noise was 105dB at a distance of 1 metre from the amp, C weighted, slow.
room 3 TL.png
bass amp on 6x6 riser.jpg



Cheers,
Jennifer



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Amp Riser Effectiveness

#34

Postby Purelythemusic » Thu, 2020-Feb-27, 09:37

Lovely work! Definitely good in your situation to have modular! I think if I need one I’ll do it in one : )


- Success in music is being able to make music whatever your situation -

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Soundman2020
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Amp Riser Effectiveness

#35

Postby Soundman2020 » Thu, 2020-Mar-05, 13:47

endorka wrote:Source of the post At last the modular riser is finished!


Wow! I'm impressed. That looks very, very nice. Jennifer. Quality workmanship, and I love the way it's all modular, so you can re-arrange things and even split off sections for separate risers. Very smart.

You should patent the idea! :)

:thu:

- Stuart -



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Amp Riser Effectiveness

#36

Postby Soundman2020 » Thu, 2020-Mar-05, 13:52

endorka wrote:Source of the post The reduction in impact noise to the rooms below and adjacent has to be heard to be believed, it is truly incredible. In the meantime, the following might be of interest...
It sure is. Once again: impressive. It looks like you are getting around 10 to 15 dB improvement across the entire mid range, and even a few dB down in the very low end. Very decent.

I'm really glad it is working so well for you so well, after all that work!

- Stuart -



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Amp Riser Effectiveness

#37

Postby endorka » Sun, 2020-Mar-08, 02:34

Thanks Stuart. Indeed, such a relief that it works so well after all that work and additional expense over building it as one. I can't remember if I've mentioned this before but the design is very similar to one in Rod Gervais' book that he mentions using to cover an entire floor. The benefits are clear - I was hoping for a reduction in impact noise to rooms below, which it has delivered incredibly well. That it also reduces impact noise to adjacent rooms is a welcome bonus, as is the reduced transmission of non impact noise to rooms below. There is no reduction of non impact noise to adjacent rooms, but this was neither sought nor expected.

And thank you Tom, yes definitely the "all in one" solution is the path of sanity :-) Saying that, all the hard work is now in the distant past and I'm enjoying the modular benefits already. I've just used the 6x6' version for drums in a full band recording. Plenty of room for the bass player to go alongside. The 4x2 riser was in the other room for the guitar amp. Worked a treat.
6x6 drums.JPG
2x4 amp.JPG


Cheers,
Jennifer



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Amp Riser Effectiveness

#38

Postby endorka » Sun, 2020-Mar-08, 20:52

Here are the test results for non impact sound transmission from room 1 to room 2 (adjacent via the landing) with an REW sweep with the amp on and of the riser. Same test setup as previous post;
top view.png
Sound transmission to Room 2 - on and off riser.png

My untrained interpretation is "no significant difference" between on the riser and off. The small variations in the peaks and nulls makes me wish I'd made several sets of measurements with the amp and microphone in a variety of positions to obtain better average graphs.

Cheers,
Jennifer




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