jared
Junior Member
Posts: 57
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Post by jared on Aug 15, 2020 17:45:43 GMT
Hi All and thank you Ethan for this wonderful forum. I am a producer and mixer from Johannesburg, South Africa. Unfortunately we do not have the luxury of qualified sound acousticians to help me with my current issue (at least I have not been able to source one) and I would really appreciate any assistance with the following. I have a small home studio with the following dimensions: Length: 16.4 feet (5 metres) Width: 11.15 feet (3.4 metres) Height: 9.18 feet (2.8 metres) I have fitted the studio with large bass trips in all four corners from floor to ceiling. They are 20 inches x 20 inches thick. I have also fitted the studio with 2.75 inch thick rock wool panels throughout the room (including early reflection points) as seen in the pictures. Mixing position has been measured to create the equilateral triangle. I have also placed 2 floating ceiling panels made of 2.75 inch rock wool in the mixing position and then near the back of the room as well. Dimensions of these floating ceiling panels are 7.9 feet (2.4 meters) x 3.7 feet (1.1 meters). I am using Focal Shape Twin monitors that were designed specifically for smaller studios like myself, enabling me to put the monitors closer to the front wall. I am still finding big frequency bumps and dips of around 6dB in certain frequency ranges (see sonarworks frequency measurement attached). I am using sonarworks to help the problem but I would like to get to the root of the problem and fix it once and for all. Thank you in advance! Any help and advice would be greatly appreciated! Regards, Jared
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Deleted
Deleted Member
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Post by Deleted on Aug 15, 2020 20:44:20 GMT
I'd suggest downloading REW(free) and taking "real measurements" of your room, forget about the sonarworks. We need to see your room waterfalls (modal ringing) and ETC graphs. You probably have very nasty reflections from the desk at least. I would also suggest cleaning the junk out of the room, it does affect to the room sound, especially on small rooms. Nice looking panels!
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jared
Junior Member
Posts: 57
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Post by jared on Aug 15, 2020 21:14:08 GMT
Thanks Pasim. Appreciate the reply. I'll definately download REW and take some proper measurements!
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Post by Hexspa on Aug 16, 2020 1:38:46 GMT
Ten things: 1. Welcome 2. Please keep your images small. 3. Pasim gives good advice. 4. 120Hz, off the top of my head, is probably from your ceiling. 5. Nulls at 500-600Hz are probably from desk reflections. 6. Read the stickies and consider checking out my Acoustic Analysis For Drunks series [20230917 out of print]. 7. Thicker panels are better. 8. You need a subwoofer.
9. Enjoy your stay. 10. Thanks.
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jared
Junior Member
Posts: 57
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Post by jared on Aug 16, 2020 13:11:27 GMT
thanks Hexspa. Checked out your videos. very interesting stuff. appreciate that. I'll be doing the measurements tomorrow to supply a more comprehensive room info. In the interim, how do I fix desk reflections? Also, I have 2 large panels on the ceiling, what more can i do?
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jared
Junior Member
Posts: 57
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Post by jared on Aug 17, 2020 13:07:23 GMT
@pasim, I have taken an REW measurement. What information should i upload? thanks man.
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jared
Junior Member
Posts: 57
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Post by jared on Aug 17, 2020 13:28:19 GMT
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jared
Junior Member
Posts: 57
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Post by jared on Aug 17, 2020 14:13:07 GMT
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jared
Junior Member
Posts: 57
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Post by jared on Aug 17, 2020 14:19:32 GMT
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Deleted
Deleted Member
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Post by Deleted on Aug 18, 2020 5:25:37 GMT
That ETC graph is impossible to read like that.
Just to make sure, you are using measurement microphone? Brand?
You need to measure speakers one at a time, L first then R and then both simultaneously. Both speakers at the same time is only useful for bass area inspection.
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jared
Junior Member
Posts: 57
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Post by jared on Aug 18, 2020 9:43:20 GMT
Thanks Pasim. Sorry aboiut that. Once again, appreciate your assistance. Is there a way i can email you the REW file via wetransfer? I have taken quite a few measurements left and right adjusting different things in the room.. I'm just not sure how to navigate the program and which parts I should send you. thank you!
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Deleted
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Post by Deleted on Aug 18, 2020 9:57:39 GMT
I think you can post the .mdat file here on the forums.
But to be sure about that i can trust the data, you're using some measurement microphone? Pointing straight at the ceiling, or little towards the speakers(Depending on the mic) I use always straight to ceiling pointing position. Keeping the mic at the tweeter height.
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jared
Junior Member
Posts: 57
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Post by jared on Aug 18, 2020 10:15:20 GMT
Hey Pasim, using an SPL meter aimed at the ceiling at tweet height. the MDAT file is 50mb and i think the limit for uploads on this forum is 2mb?
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Post by Hexspa on Aug 18, 2020 16:37:39 GMT
As far as the ceiling goes, a cloud absorber is not necessarily enough to counter the ceiling resonance. Having said that, I haven't seen your decay plot. If you follow the steps I outlined in the AAFD worksheet and find that your ceiling dimension is ringing then the solution is to cover more surface area with absorption. That's why I made the worksheet, after all. An SPL peak can be from one or more dimensions but it is solvable with some basic math and a bit of effort.
Desk reflections can be countered by adding absorption to the desk or using a desk with a mesh suface.
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jared
Junior Member
Posts: 57
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Post by jared on Aug 18, 2020 16:50:42 GMT
thank you Hexspa. much appreciated! Where can i access the AAFD worksheet?
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