• WANTED: Happy members who like to discuss audio and other topics related to our interest. Desire to learn and share knowledge of science required as is 20 years of participation in forums (not all true). Come here to have fun, be ready to be teased and not take online life too seriously. We now measure and review equipment for free! Click here for details.

PSI's AVAA Bass trap review

Thomas savage

Retired Sheriff
Moderator
The Watchman
Patreon Donor
Joined
Feb 24, 2016
Messages
6,757
Likes
3,619
Location
uk, taunton
#2
No in room measurements...oh there is, kind of but I can't make head nor tail of it.. Seems like waffle to me.

The conclusion seems to be , spend £5ooo plus in order to take out two bass traps... :rolleyes:

How are these better than a well setup multi sub system?


They seem like a very expensive way to gain a minimal benefit.
 
Last edited:

Cosmik

Major Contributor
Joined
Apr 24, 2016
Messages
2,780
Likes
1,520
Location
UK
#3
The last few paragraphs sum it up for me. It'll never be possible to just listen to music with such a system - there'll always be something to tweak.

If the aim is to 'remove the room', would simply sitting closer to smaller speakers do the trick?
 

Cosmik

Major Contributor
Joined
Apr 24, 2016
Messages
2,780
Likes
1,520
Location
UK
#5
Sitting closer would but won't do anything about standing waves.
Keith
Just a question of proportion of direct to reflected sound. If you put your ear to your speakers, you won't notice any standing waves in the room. Sitting closer to smaller speakers is part way to that.
 

Purité Audio

Major Contributor
Industry Insider
Barrowmaster
Joined
Feb 29, 2016
Messages
3,084
Likes
920
Location
London
#6
It really depends upon the amplitude of the standing wave, in my room the +20dB peaks were easily discerned even sitting close to the loudspeakers.
Keith
 

Thomas savage

Retired Sheriff
Moderator
The Watchman
Patreon Donor
Joined
Feb 24, 2016
Messages
6,757
Likes
3,619
Location
uk, taunton
#7
It really depends upon the amplitude of the standing wave, in my room the +20dB peaks were easily discerned even sitting close to the loudspeakers.
Keith
Yes but two of these won't make much of a impact on that... Will they?
 

Purité Audio

Major Contributor
Industry Insider
Barrowmaster
Joined
Feb 29, 2016
Messages
3,084
Likes
920
Location
London
#8
In that room, reducing the amount of energy via EQ has worked really well.
We are going to have PSI here, I will give the AVAa traps a trial in an untreated room and report back.
Keith
 

Thomas savage

Retired Sheriff
Moderator
The Watchman
Patreon Donor
Joined
Feb 24, 2016
Messages
6,757
Likes
3,619
Location
uk, taunton
#10
In that room, reducing the amount of energy via EQ has worked really well.
We are going to have PSI here, I will give the AVAa traps a trial in an untreated room and report back.
Keith
That would be great Keith, thanks!
 

Cosmik

Major Contributor
Joined
Apr 24, 2016
Messages
2,780
Likes
1,520
Location
UK
#11
Why not go all the way to isolating headphones?;)
Yes, I mentioned that in another thread on room correction, but someone said they didn't like the 'in head' experience. However, with in-ear measurements and appropriate DSP that needn't be a problem either.
 

Fitzcaraldo215

Major Contributor
Joined
Mar 4, 2016
Messages
1,421
Likes
512
#12
Yes, I mentioned that in another thread on room correction, but someone said they didn't like the 'in head' experience. However, with in-ear measurements and appropriate DSP that needn't be a problem either.
This would be my choice:

http://www.smyth-research.com/products.html

But, what it does is mimick the room in which it is calibrated, in addition to calibrating your head transfer function, both via the in-ear mikes. So, you still need a good room and system setup during calibration to get it right. Maybe Amir would start selling tickets to folks to let them calibrate in his best room?

Actually, it will store a library of different rooms you have calibrated it in for selection.

Kal reviewed it, as has Gary Reber in Widescreen Review.

Sorry for the OT digression.
 

amirm

Founder/Admin
Staff Member
CFO (Chief Fun Officer)
Joined
Feb 13, 2016
Messages
19,014
Likes
19,412
Location
Seattle Area
#13
Why is the graph so fuzzy???



I can't read any of the axis labels. Squinting anyway, the improvement in very low frequencies (at the beginning of the graph in orange) is significant. It essentially flattened the response from 30 to 50 Hz. This is darn near impossible with a few absorption panels.
 

Kal Rubinson

Addicted to Fun and Learning
Joined
Mar 23, 2016
Messages
869
Likes
652
Location
NYC/CT
#14
Why is the graph so fuzzy???
It looks like a low-res screen grab. Most of the graphs in Stereophile are created by the editor from datafiles (his or from other writers).
 

RayDunzl

Major Contributor
Central Scrutinizer
Joined
Mar 9, 2016
Messages
6,837
Likes
2,975
Location
Riverview, FL
#15
I can't read any of the axis labels.
The graph in the rag has only dB and kHz (sic).

Left axis is 1dB steps 65 to 85 dB, and bottom is 10 to 1000 Hz.

The panel below that would seem to be several measurements in REW of which 3 are selected to display (not included in the print version).
 

amirm

Founder/Admin
Staff Member
CFO (Chief Fun Officer)
Joined
Feb 13, 2016
Messages
19,014
Likes
19,412
Location
Seattle Area
#16
The testing involved 3 of these units. Would be good to compare three subs to three of these. The subs would take more work but I think they will do better for the listening position.
 

h.g.

Active Member
Joined
Mar 14, 2016
Messages
110
Likes
8
#17
Thanks, that helps with where Bob Katz is coming from and adds one or two things to the plot which was shown earlier in the other thread.

The overly smoothed plot is annoying because it distorts what the devices are doing. I suspect people might be a bit happier if they could see what they are actually doing to reduce the actual peaks and fill in the actual dips without the smoothing doing it as well. Particularly below 80 Hz where the passive treatment is not going to be effective. Hopefully you will show us more informative plots when examining what your PSI devices are doing in your room and save smoothing away the peaks and dips for the final marketing plot?
 

h.g.

Active Member
Joined
Mar 14, 2016
Messages
110
Likes
8
#18
Thanks, that helps with where Bob Katz is coming from and adds one or two things to the plot which was shown earlier in the other thread.

The overly smoothed plot is annoying because it distorts what the devices are doing. I suspect people might be a bit happier if they could see what they are actually doing to reduce the actual peaks and fill in the actual dips without the smoothing doing it as well. Particularly below 80 Hz where the passive treatment is not going to be effective. Hopefully you will show us more informative plots when examining what your PSI devices are doing in your room and save smoothing away the peaks and dips for the final marketing plot?
 

dallasjustice

Major Contributor
Joined
Feb 28, 2016
Messages
1,269
Likes
714
Location
Dallas, Texas
#20
Here's more measurements taken by Nyal Mellor from a client's room. He took more measurements than these. I just took the best one and overlaid it with the off position. These results seem to be consistent with Bob Katz's results. IMO, these are modest improvements when compared with what a pair of subs can do. However, it seems to make alot of sense for the audiophile who fears DSP or doesn't want to load the room up with fiberglass panels or expensive modex plates. ;)
best vs. off avva.jpg
best vs off waterfall.jpg
 
Thread starter Similar threads Forum Replies Date
Purité Audio Desperate Dealers Forum 35
Purité Audio General Audio Discussions 1

Similar threads

Top Bottom