bass traps ?

[beefy]

Hi,

I`m looking to getting some base traps and have read that they work best if they are not pushed right up to the wall. Can any one tell me the preferred gap that is required?

regards.

 

[RobinKidderminster]

Search for bass trap and room treatmentnhere and elsewhere. Most bass traps would be against the wall with no gap - not sure where your question comes from.

 

[ellisdj]

Bass traps have an air gap behind them

The distance from the wall depends on the thickness of the material used for absorption 4 inch absorption with 6 inch air gap be the bomb in the corner

 

[BigH]

http://www.skumacoustics.com/gb/bass-traps/10-havsvag-bt.html?gclid=CPOqsJqL98YCFYvHtAod6M4FSg

6 inch gap how do you attach them to the wall?

 

[RobinKidderminster]

Avoid foam. Not dense enough for the frequencies required. Found some from US at 500$. Not sure if that's for 1, 2 or a set. Even these used fibre glass. Useless.. My DIY version cost much less than £100 for 4 and a couple of panels. (One poster suggesting they would be 1-2% effective! Stupid comment). 6in Rockwell or more is a start depending on how easy to fit them. I think the gap is less important but I'd need to do my homework

 

[ellisdj]

The airgap is what extends the freq absorption. dont leave out an airgap. You want as broadband absoprtion as possible, deep as possible for an even sound. GIK and Realtraps have airgaps built in - this is for a reason

Example here

Robin you can say my comment is stupid the effect being 1-2% measured difference, that is me guestimating by looking at the picture of what you have made behind your front speakers - you have not measured so you do not know their effect, you should do and prove me wrong. The difference wont be anywhere near as big as you think it will.

I know it takes the right panels in the right place to have any real measurable effect on bass, it takes a lot as well - there are a lot of corners in a room - 4" absorption 2" air gap - is a good one across a corner - floor to ceiling if poss

 

[RobinKidderminster]

The airgap is what extends the freq absorption. dont leave out an airgap. GIK and Realtraps have airgaps built in - this is for a reason

Example here

Robin you can say my comment is stupid the effect being 1-2% measured difference, that is me guestimating by looking at the picture of what you have made behind your front speakers - you have not measured so you do not know their effect, you should do and prove me wrong. The difference wont be anywhere near as big as you think it will.

I know it takes the right panels in the right place to have any real measurable effect on bass, it takes a lot as well - there are a lot of corners in a room - 4" absorption 2" air gap - is a good one across a corner - floor to ceiling if poss

Sorry solidify - I'm not going to discuss the same issues again - I did not mention your name. My 1-2% comment is rubbish since it has no mathematical significance. How can you guess that a unit of unknown construction will absorb 1-2% of some arbitrary frequency or ... ????? Hence nonsense. I do know that commercial products are available which are built in a very similar manor and many respected DIY designs are similar - non specify any mathematical figures. What % do you assign to your corner traps?

I only have 4 corner traps. A large panel trap made no difference so I didn't use it. Obviously bigger/more room treatment would make a big difference but I don't have the luxury of a purpose built studio/HT.

Finally, my reading of GIK corner traps is that they are 'Fuller's (no air gap) - but I am not 100% sure and I am happy to be contradicted on this one.

Good night

 

[ellisdj]

Robin gik produce actual lab tested figures of what their products do.
Their bass traps have built in air gaps trust me or ask them or read what they say

Their ceiling brackets are designed to give a 4inch air gap

This is for a reason to extent the freq they absorb otherwise the panel absorbs mid range not any bass look at the graph I linked to. That's 4 inch with either 2 or 4 or no airgap. No airgap it only absorbs midrange really

What happens wave travels through absorption hits wall and travels back out through absorption again

Best approach measure the listening room look at the problems and try and treat for them. I.e see what you have to start with to see what you will need

Or you can treat corners with best products you can get away with as much as poss.

You need measure freq response - see how much it takes to make a difference here - lots
Waterfall the decay see how even and what problems exist most difference made here

RT60 check reverb time of room. Big differences made here for mid and treble

All of it is worth it imo. Tighten sound right up.

 

[RobinKidderminster]

Damned auto-correct.

As I said - I'm happy to be corrected on the 'gap' thing. When I made my traps I did lots of research and the solid rockwool corner was/is common but I understand where your comments come from.

I am a snake-oil hater and readily accept placaebo as a major factor - which is why some like me, insist on scientific measurement or testing. I made this clear in my years old experiments with DIY traps. I also said that although not an intention nor necessarily an indication that my efforts were successfully improving my room acoustics, I did say that the traps removed the very boomy bass at the other end of my room.

In other words - my 1-2% definitely had a significant effect (outside my listening area) and hopefully it has made a small improvement to my listening experience.

Still waiting for your calculus equations to excuse your condescending mathematical estimations.

 

[RobinKidderminster]

Hi,

I`m looking to getting some base traps and have read that they work best if they are not pushed right up to the wall. Can any one tell me the preferred gap that is required?

regards.

Whilst not clearly understanding your needs - If like me you are just trying some DIY ideas, I suggest you buy some Rockwool (£20 but messy stuff) and 'throw' it in the room corners and erect some temporary panels. If the results are promising then there are loads of DIY projects on YouTube to give you construction ideas.

If on the other hand you are looking to construct a well treated 'studio/HT' then there are a few respected forumites and GIK etc who will give advice.

Good luck

 

[RobinKidderminster]

Duplicate post

 

[ellisdj]

Robin mate its great you have made bass traps and are interested in this area. I applaud that.

The 1-2 % was from a different argument but it's still.not a silly point.

You would expect to look at the result after hearing what you have and expect big changes / improvements. Fact is there just won't be. It will be very small differences and probably not in the freq range you expect either

It takes lots of treatment and focusing the right product in the right place to get good results. It's cheaper to make your own but it makes more sense to pay the money and get a product that works exactly as you need where you need it.

I had all diy panels before swopped them out for gik big improvement. They work better simple as that.

You want as much bass absorption as you can while not overdoing the mid and top. Most diy panels will be the opposite.

Pay the money get products that work properly it's worth it in the long run you get free advice as well

 

[RobinKidderminster]

i will agree 21.5%, disdisagree 41.35% and do the maths for the remaining % putting it down to placaebo. Great F1 race today

 

[BigH]

Hi,

I`m looking to getting some base traps and have read that they work best if they are not pushed right up to the wall. Can any one tell me the preferred gap that is required?

regards.

Whilst not clearly understanding your needs - If like me you are just trying some DIY ideas, I suggest you buy some Rockwool (£20 but messy stuff) and 'throw' it in the room corners and erect some temporary panels. If the results are promising then there are loads of DIY projects on YouTube to give you construction ideas.

If on the other hand you are looking to construct a well treated 'studio/HT' then there are a few respected forumites and GIK etc who will give advice.

Good luck

Robin, there are several Rockwool products is it the Flexi Acoustic slab you are talking about?

 

[BigH]

Why is every post duplicated on this site?

 

[RobinKidderminster]

Not seen the flexi-slab. Seems better. I use RW60 (I think that's the stuff)

 

[RobinKidderminster]

@ellisdj

I'm was interested in your room correction and graphs. I understand you are still looking for improvements as would I with only a 1-2% - wondering what % your setup is currently achieving.

Provocatively this is not a stupid question.