Room Acoustics Forum by Rives Audio

Welcome! Need support, you got it. Or share you ideas and experiences.

Return to Room Acoustics Forum by Rives Audio

Room Acoustics Forum by Rives Audio

New Room has an Echoooooooo

67.1.75.254

[ Follow Ups ] [ Post Followup ] [ Thread: Display Email Next ] [ Room Acoustics Forum by Rives Audio ]

Hello,
I finally moved into my listening room, and as expected, there is a bit of a bass boom that needs taming, and the reverb time accentuates the highs and makes it too bright and shrill. My question is, where do I start, to evaluate: what kind of absorbers are needed and where to place them? I played with some cheap foam pads (4' x 6' x 4") behind the speakers and the listening position and found they made a nice improvement in added clarity, but not sufficient.
Room is 21'8" X 15' x 7'9". The walls & ceiling are dbl. sheetrock on RC, the floor is 1/2" carpet, 1/2" carpet pad over plywood, over 1" rock wool board,over 1" t&g plywood.
Thanks for your help
joeb

Follow Ups:

Re: New Room has an Echoooooooo - Robin88 10:15:57 03/09/04 (0)
I too also have similar problem after changing listing room. Have read many articals and reviews about acoustic treadment, but yet to commit on the brand. I lived in HK and narrow my choice to Ecco Buster or DAAD - Diffusion Absorption Acoustic Devices by Acustica Applicita. www.acusticaapplicata.com/english/prodotti.html
For controling LF of 50Hz and up, DAAD4 cost twice the price of Bass Buster. Instead of just absorption, it also diffuse thereby keeping the sound energy inside the room. The salesman also claimed they are much more effective on LF vs. Bass Buster. Have also listen to them in another audio shop rooms with some very high-end gear producing excellent soundstage and very low noise floor, but not sure how much it contribute. My concern is that I cannot find any reviews on the net for 2nd opion. Has anyone else heard of them or try them??
Re: New Room has an Echoooooooo - Ethan Winer 10:14:07 03/08/04 (1)
Joe,
For a good overview see the Acoustics FAQ, second in the list on my Articles page:
www.ethanwiner.com/articles.html
That article will give you a good understanding of low frequency versus mid/high frequency absorption, plus many other related issues. Then post any follow-up questions here.
--Ethan
- Re: New Room has an Echoooooooo - jobo 22:09:12 04/02/04 (0)
  For Ethan,
  I have read and re-read your article. I have also graphed the frq. modes/nulls. This explains the "ringing" or "flutter echo" in the high end. While my room dimensions are less than ideal: (23x15'3"x7'9"), I am compensating by adding a large book shelve to the rear wall, behind the listening position. I am making bass traps for the corners, walls & ceilings at the first reflection points. I also have 24 sq.ft. of RPG diffusers to place strategically. I have a couple more questions for you, when you have time. If I make the corner bass traps using 705, will it add more absorption if I fill the cavity behind the 705 with "fluffy" rolled insulation? And next, where is the best place to put the RPG's? And finally, if you remove the reflective foil on the 705, will it increase the absorbtion coefficient?
  Thanks,
  Jobo
Re: It takes a lot of experimentation.... - mkuller 10:07:49 03/08/04 (2)
After moving into my dedicated room, it took me about a year and half to get it to sound like I thought it should. Then I discovered a 30Hz standing wave at the front wall... Get a CD with test tones and ply it while you walk around in the room. Walk around the side walls and clap your hands to discover where the echo is the worst and apply absorption or diffusion there. Experiment, experiment...
Regards,
Mike
- My dedicated room and system. (Open in New Window)
- Re: It takes a lot of experimentation.... - Schilke B1 11:26:44 03/08/04 (1)
  mkuller,
  How do you like the ASC traps? Do your bookshelves, flanking them, block their effectiness? Did you consider Ethan's Mini Traps? They are suppose the be more effective in the low base. Thanks.
  - Re: ASC Tube Traps seem to work fine.... - mkuller 13:32:20 03/08/04 (0)
    As I said there was/is a 30Hz standing wave at the front wall - with the Tube Traps it is less obvious. I first became aware of the problem when someone brought over a signal generator with a microphone and print-out. I don't have any measuring equipment myself, so I can't measure their effect. I assume the Traps in the corners by the bookshelves are helping - without them there would still be "pressure zone" there, regardless of the bookshelves. I haven't tried any other type of bass traps - these are about 10 years old - the 20" diameter ones were custom-made, I believe for a speaker manufacturer to use at a CES show. I picked them up second hand.
    Regards,
    Mike

This post is made possible by the generous support of people like you and our sponsors:

Sonic Craft

You can not post to an archived thread.