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In the Forum: Audio Discussions
In the Thread: Romy The Cat's new Listening Room

Post Subject: Some explanationsPosted by unicon on: 8/10/2010

Romy the Cat wrote:

The bass traps, the biggest one, have only limited effectiveness on the spectra of interest and usually have much more effectiveness in 2-3 octave above the spectra of interest. This make bass to sound less problematic but it dries out the bass’ overtones, - I do not like it. Also, the bass traps are a solution for single box speaker.

I understand when you say bass traps have limited effect on low bass and thats mostly correct but not always ...the reason is they are not real bass traps they claimed .

The bass which has lots of energy is much like air motion (below 100hz) and hard to control or absorb.
we only have 3 choices in closed spaces to control them without drying out the upper bass :
1-resonate (limp mass)
2-lump mass
In situation 1 you need to have something vibrating so it can absorb the bass in closed room much of the bass is absorbed by resonating walls and items in it.and yet much of the bass is still enable to pass through the walls because its energy. if you have loose or thick walls more bass can pass through but the problem may rise after the main sound stops in air and they start vibrating and making the Q in your room to rise up.
if you make the walls harder less vibration but the reflected bass inside the room remains after the main sound source stops.
the ideal is to let less bass pass through while having more bass absorbed im not going into this subject right now .
and you can also get help from resonating panels which can resonate at low frequencies and stop immediately. that cant be easily done.or tune.

In situation 2 you can use rlc circuited acoustics to tune n build a circuit which can have fx to absorb a bass frequency
an example is a tuned port box which if it gets tuned to low Q frequency it can damp the specific bass frequency.
or if you can make something to act like this circuit then you can have benefits of damping your problematic bass Fq without even touching ur upper bass. yet thats not an easy game.

AND if you use something like fake bass traps which use simple distributed mass acoustics then you end up with that Wilson sets...
yes ... killing all your mid bass n hardly effecting the fundamentals that is how many companies out there claim to make bass traps and sell you bunch of fiberglass clothed racks as bass trap...

Romy the Cat wrote:

I would like do not correct my room under 1Khz but rather to optimize my Macondo to take advantage of whatever good or bad my room does.

well I am not dictating that you fail trying this way because there are many mixed parameters out there in real world which can change the way you can get a good sound. so i never say not do or try not that. it is a MUST .

but the basic is tuning your room bass first because there we have many good reasons for it like:

1- That is where all the positioning matters and change A LOT.like moving sound source to other side of a room.

2- you cant run away or try to get any good sound if you have problem in that region

figure it out

and if you wonder where if anyone making or doing any real good to acoustics :

there is a good acoustic company in u.s.a called ASC the owner Art Noxon is knowing what he is doing and the tube traps they have made can absorb down to 20hz ...

he always friendly for any question about rooms and etc...

he can give you really good tips beside what he can offer you commercially

read their site about how to trap bass without drying uppppper bass:

http://www.asc-hifi.com/acoustic_basics.htm#1

in article there is a link too about it i dunno where to find it atm

I know what you may think. dw I am not an ASC worker

I myself built a new type of tube trap and used it in my room and the results are decent and what I was looking for.

I create a new threat for it soon cuz its been finished ... and there i share more info

rgz

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