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Acoustic treatment finished... your thoughts on the results?

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Acoustic treatment finished... your thoughts on the results?

Postby Skol303 » Mon Jan 21, 2019 5:30 pm

Greetings SOS folk!

I've just finished treating my room - you can download a copy of the REW file here to see the results:

https://www.dropbox.com/s/11v3f2pucahh9 ... .mdat?dl=0

As a final step I'd like to solicit some objective opinion on how "good" the end results really area (especially as I've been very close to this project for about a year and it's become difficult to judge it without personal bias). The general questions being:

1) Would you be happy with this room?
2) Are there any issues that stand out as needing further attention?


All comments very gratefully received. Thanks :thumbup:
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Re: Acoustic treatment finished... your thoughts on the results?

Postby Watchmaker » Mon Jan 21, 2019 5:44 pm

no offense intended but..erm, I'm a tad nervous about that link. moderators?
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Re: Acoustic treatment finished... your thoughts on the results?

Postby CS70 » Mon Jan 21, 2019 6:27 pm

Watchmaker wrote:no offense intended but..erm, I'm a tad nervous about that link. moderators?

It is a dropbox link (on the actual dropbox domain) so no big deal, and MDAT is a measurement data format, so I wouldn't worry. Guess you'll need a specialist application to open it tough.
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Re: Acoustic treatment finished... your thoughts on the results?

Postby Skol303 » Mon Jan 21, 2019 11:01 pm

Sorry guys! Yeah... totally understand concerns over the link. My bad :headbang:

I couldn't find a way to upload images here, but I assume I can do so via an image hosting site. I'll update the tread with some pictures ASAP.

The download is an .mdat file from REW software (Room EQ Wizard), which is freely available. I thought it would be familiar to folks here, but shouldn't have assumed!
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Re: Acoustic treatment finished... your thoughts on the results?

Postby Skol303 » Mon Jan 21, 2019 11:21 pm

Ok, thread updated with some pictures rather than a suspicious-looking Dropbox link ;) (but trust me, the Dropbox file is legit if you're interested...).

Frequency response:
Image

Frequency response average (average of 18 measurements taken within 1 sq. metre of listening position)
Image

Decay (waterfall):
Image

Impuse response:
Image

Reverberation (RT60/Topt):
Image

Group Delay
Image

Room plan (ceiling panels ‘hidden’):
Image

Critical comments on the room measurements very welcome :thumbup:
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Re: Acoustic treatment finished... your thoughts on the results?

Postby Watchmaker » Tue Jan 22, 2019 2:22 am

Well, two lessons at least for me! Thanks Skol303 for keeping it real and not dissing my paranoia! I have REW but haven't run it since my last reconfig because I have a room that is beyond help at the moment. (for the moment it's -20 C so no work going on...)

I'm no expert on acoustics but those specs are significantly less chaotic than my room. Seems reasonably "flat" to an ignoramus such as I, in that there's an aesthetic order to the mathematics represented in the graphs. Some of it I can interpret with layman's competence, some of it I'm not sure how to interpret. I'd be interested to hear discussion on how to think about the reverb time graph in practical terms. What do you use this room for?
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Re: Acoustic treatment finished... your thoughts on the results?

Postby Skol303 » Tue Jan 22, 2019 11:38 am

Watchmaker wrote:Thanks Skol303 for keeping it real and not dissing my paranoia!... I'd be interested to hear discussion on how to think about the reverb time graph in practical terms. What do you use this room for?

Thanks for the input and rest assured I share your paranoia over spurious download links! :) I should have thought it through better and just posted some images first, rather than the REW file.

It’s a small, amateur mix room rather than a space that’s also used for live recording (I do record some electric bass, but that’s nearly always DI’d).

The RT60 plot - to my untrained eyes - suggests that the room is perhaps too ‘dry’ and over-damped by bass traps; and that I should maybe seek to brighten it up a little by adding some reflective surfaces (reducing high frequency absorption). That said, the room does actually sound ok to my ears - almost identical to my HD600 headphones, if that’s anything to judge by.
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Re: Acoustic treatment finished... your thoughts on the results?

Postby Watchmaker » Tue Jan 22, 2019 12:26 pm

I'm surprised no on else has commented yet. That the room was almost dead was my suspicion. Good for listening but hard to play in?
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Re: Acoustic treatment finished... your thoughts on the results?

Postby Mike Stranks » Tue Jan 22, 2019 1:30 pm

Watchmaker wrote:I'm surprised no on else has commented yet. That the room was almost dead was my suspicion. Good for listening but hard to play in?

Interesting point... I'd wondered the same.

My room is almost the same dimensions and, due to 'management' restrictions has a lot less acoustic treatment in it. However, it's fine for spoken word recording and mixing. I think if there was any more treatment in here any sort of recording using mics would be difficult for the performer.

Reminds me of BBC Local Radio studios... excellent for spoken voice... really difficult for any musos brought in to do live-to-air broadcasts.

But that said, the plots look very good. If it works for the OP.... :thumbup:
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Re: Acoustic treatment finished... your thoughts on the results?

Postby blinddrew » Tue Jan 22, 2019 1:36 pm

Not been in a position to see the pictures yet (not entirely sure I'd have the knowledge to make any informed comment when I do, but that's a separate subject), but if you're worried about things being a little over-damped, there was a really good suggestion on one of these threads (I think!) a while back.
The chap in question had hung wooden venetian blinds in front of some of his absorbers so that they could be raised or lowered, with the slats angled, to add a couple of square meters of reflective surface on demand.
Seemed like a simple way to add some tuning depending on the job in hand. :)
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Re: Acoustic treatment finished... your thoughts on the results?

Postby James Perrett » Tue Jan 22, 2019 2:35 pm

It certainly looks very well damped - both from the plots and from the picture of your treatment. Do you find it comfortable to work in? I like going into a dry sounding studio - the change of acoustic space makes it feel like a studio rather than just another room.
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Re: Acoustic treatment finished... your thoughts on the results?

Postby Martin Walker » Tue Jan 22, 2019 4:46 pm

James Perrett wrote:Do you find it comfortable to work in? I like going into a dry sounding studio - the change of acoustic space makes it feel like a studio rather than just another room.

This seems to be a very personal choice - some people react to a dead room almost like they would to an anechoic chamber, feeling nervous and a bit unbalanced, while others think 'great, it's a recording studio!' ;)


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Re: Acoustic treatment finished... your thoughts on the results?

Postby Martin Walker » Tue Jan 22, 2019 4:50 pm

Hi Skol303, and welcome to the SOS Forums! 8-)

Those plots do indeed look impressive (particularly the waterfall response, which is admirably flat down to below 40Hz!)

Like the others here though, I can't help wondering from your image of the treatment (beautifully placed as it is) if this room does feel rather 'dead'.

Mind you, if it sounds similar to your HD600 headphones then it must be a good place to work in, as they are renowned for their flatness out of the box.


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Re: Acoustic treatment finished... your thoughts on the results?

Postby Skol303 » Tue Jan 22, 2019 5:09 pm

^ Thanks everyone. Some very good points above.

Regarding dryness... yes, the room is very "dead" - it's like a big pair of headphones and almost anechoic. I find it a very peaceful and Zen-like space in which to work, but others may feel differently. My wife certainly feels a little "nervous" in the room, but that may just be on account of proximity to bass guitars and other musical clutter ;)

It seems to work well as a mix room, but would probably be problematic for recording with mics due to the almost total absence of reverb above the low end. I mostly record DI, only occasionally mic'ing up a bass cab when I want to move some air.

The frequency response and to some extent the decay times are partly controlled using DSP software (I use Dirac Live), which I find to be invaluable in a room of this size. Without it the room has a frequency response of +/- 8dB (still not too shabby), but with the DSP engaged this comes down to +/-5dB or less around my listening position, which I'm very happy with.

The DSP software would be of no use without lots of acoustic treatment of course (I learnt that lesson earlier on in the process!), but it's been a very useful tool in making both fine and quite substantial finishing touches. For instance: I've been able to crank up my sub to help "fill in" some of the low end dips, and then tame the resulting peaks with digital EQ. This is how I've achieved the fairly respectable frequency response / decay times in the low end. It's also useful for dialing in a house curve to the frequency response, something I'm still experimenting with: currently adding a slight boost to the lows and gentle downward shelf in the highs.

PS: Nice idea about using Venetian blinds as slats over the top of my existing absorbers! I think we have a set of old blinds in the attic somewhere that I could experiment with. Hmm... :)
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