[Hoiman]

Although I have not been to his place

Still welcome.

[Anonamemouse]

Still welcome.

Nou heb ik de komende 5 dagen vrij...

[Hoiman]

mooi ik de komende 4. Tot vrijdagmiddag staan de B&Ws er nog die worden daarna opgehaald dan heb ik alleen nog de Kharma's en mijn eigen speakers (maar daar is het probleem niet op te horen, tenminste niet het resoneren).

[Anonamemouse]

Donderdagmiddag, uurtje of 3?

[Hoiman]

Prima kom maar langs, ik ben thuis.

[Anonamemouse]

I visited Hoiman and his lovely wife yesterday. His livingroom is a lot larger than mine, and basically is a massive concrete box. The problem is the standing wave, which is VERY obvious at 30-35 Hz.
Changing amplifiers is not going to help there. Bass traps will help, but I doubt it will be enough. I have sent him a link to a company that builds nice ones ( https://akoestiekopwerk.nl/ ), we could also wake up the powertools and build them ourselves, which is more fun.

In my opinion a DSP (like) system would be the best solution for Hoimans sonic challenge.

[James Tanner]

I visited Hoiman and his lovely wife yesterday. His livingroom is a lot larger than mine, and basically is a massive concrete box. The problem is the standing wave, which is VERY obvious at 30-35 Hz.
Changing amplifiers is not going to help there. Bass traps will help, but I doubt it will be enough. I have sent him a link to a company that builds nice ones ( https://akoestiekopwerk.nl/ ), we could also wake up the powertools and build them ourselves, which is more fun.

In my opinion a DSP (like) system would be the best solution for Hoimans sonic challenge.

A Bryston Model T Active system would be perfect.





james

[Hoiman]

I visited Hoiman and his lovely wife yesterday. His livingroom is a lot larger than mine, and basically is a massive concrete box. The problem is the standing wave, which is VERY obvious at 30-35 Hz.
Changing amplifiers is not going to help there. Bass traps will help, but I doubt it will be enough. I have sent him a link to a company that builds nice ones ( https://akoestiekopwerk.nl/ ), we could also wake up the powertools and build them ourselves, which is more fun.

Yep was really nice to meet Anonamemouse, next time at his house. We think we find a solution in a nice photo bass trapp on the wall, one or more. After that we can try a dsp device.

[James Tanner]

Hi Hoiman

Here's the formula for figuring out how thick an absorber has to be (even at 250Hz) before it can affect (absorb) a given frequency.  As you can see at 35Hz you are talking major dimensions.

Reflection Time Delay Formula:

First Null frequency = 1/ (2x TimeDelay)

Example:

2 ms reflection =  0.002 second reflection

First Null frequency = 1/ (2 x 0.002) = 250 Hz,
Then each 500 Hz above (250x2=500), 750,1250, 1750 etc...


AbsorberThickness Formula:

1130/ (4 x First Null frequency)

Example:

For 250 Hz absorption:

1130 / (4 x 250)  = 1.13 ft thick.

[Anonamemouse]

Hi Hoiman

Here's the formula for figuring out how thick an absorber has to be (even at 250Hz) before it can affect (absorb) a given frequency.  As you can see at 35Hz you are talking major dimensions.

Reflection Time Delay Formula:

First Null frequency = 1/ (2x TimeDelay)

Example:

2 ms reflection =  0.002 second reflection

First Null frequency = 1/ (2 x 0.002) = 250 Hz,
Then each 500 Hz above (250x2=500), 750,1250, 1750 etc...


AbsorberThickness Formula:

1130/ (4 x First Null frequency)

Example:

For 250 Hz absorption:

1130 / (4 x 250)  = 1.13 ft thick.

Hmm... This might be a minor challenge...