Replacing sound proofing in cabniets

Hi Sean,

After re-reading these posts I see that you are right - stuffing the ports was not specifically mentioned. Although filling the interior with foam to replicate a transmission line does prettty much fall into the catagory that I'm describing - that by making a significant change to the speaker's basic design actually improves performance does call into question whether buying an intrinsically well designed speaker would be more appropriate.

Best,

Barry Kohan

You can't replicate the response of a transmission line with anything other than a transmission line and even then there are variables involved. Other than that, i try to avoid vents of any type as much as possible. If i had to choose out of what is commercially available, i typically prefer sealed low Q designs. Second would be an IB ( Infinite Baffle ) and third would be a stuffed or partially stuffed T-Line. Bringing up the rear in a very distant fourth place would be an aperiodic ( vario-vent ) design. Anything else would be WAY down the list. Sean
>

Hi Sean,

I generally agree with your post. The reality for a designer of a commercial speaker is that they are always walking a tightrope and doing a balancing act. No matter what the price point of a speaker (even the relatively new breed of extreme megabuck speakers) the designer is constrained by cost of parts, manufacturing and marketing versus the quality and performance of the parts available versus the size of the speaker system and its practicality for shipping and placement within the customer's home.

In the speakers that I have designed for commercial sale, maintaining a moderate size was a siginificant factor and an aperiodic loading chamber was employed to provide the target response for the system.

In my personal speaker system I do use a low Q sealed system for the dynamic woofer section.

Best,

Barry

Disclaimer: I am a manufacturer of loudspeakers and vibration control products.

Sean and Bright star...have you ever heard of anyone using the black undercoating in a spray can that can be bought at any of the larger auto parts stores for damping? I really think that would work very well..whatcha think?

.
Hi Tunes4me,

The spray may be useful to damp the interior of a component's chassis. It would mainly damp gross ringing of the chassis but it can't absorb a large amount of vibration or even damp ringing as effectively as some other applied coatings or materials. The damping spray would be considered only PART of an overall scheme to eliminate vibration.

Best,

Barry