Hi guys Thinking about building some membrane traps to supplement my rock-wool corner panels. I've been doing some reading on membrane traps and have an idea..... Why not tune the resonance of the membrane to the frequency we need to trap? It should be very easy build a trap with a membrane...

Hello John, I am using the "Find Resonances" in "Modal Analysis" to identify my room measured resonances. I use the resonance selection to view the resonances on the chart. I want to find the accurate bandwidth (or Q) of each resonance. Can I do it by drawing a -3db lines on the specific...

Hi, I'm planning on building two LLT subs with 2 dayton titanic mk3 drivers I got for a great price. I want to stick to Mr Steve Callas' specifications as much as possible but have run into an issue: With a 6" port I have a peak airspeed of 28m/s and a port resonance of close to 250Hz. This...

Edit: Cut from another thread that went off topic. Mike P. Ryan, I think alot of people get too hung up on simulations in WinISD to be honest. My subs for example tuned to 13.5hz, people where saying the 1st port resonance is too low at 138hz and you won't be able to use a higher crossover...

Sega bringing Tri-Ace's Xbox 360 and PlayStation 3 RPG to North America on March 16. Sega won't have to wait much longer to see if its upcoming role-playing game Resonance of Fate will resonate with Western gamers' tastes. The publisher today announced that it will be releasing the...

Does anyone know how to calculate the Line resonance of a Quarter Wave line tuned to 80hz? Getting ready to build a Quarter Wave using two Fostex 103's. Wanted to see how much problem I am going to have with line resonance. I usually line them with wool but never really thought about why. :) Matt

This thread is for all discussion of the Port Resonance article found on AV Sound Lab.

Hey, I have done a few tests with a flat frequency through my HK635 and added a waterfall in the mix to show the resonance I am experiencing. According to ten tests along my front wall the curve with the least amount of dips was in the right corner. I have taken the measurement with the bare...

So I have recently purchased a new sub and FBQ. After reading through numerous days of reading and pouring over documentation I feel that I have done everything I can with REW and the FBQ. I Still find a very annoying loud vibrating resonance when music gets down in the lower frequencies (my...

So I have recently purchased a new sub and FBQ. After reading through numerous days of reading and pouring over documentation I feel that I have done everything I can with REW and the FBQ. I Still find a very annoying loud vibrating resonance when music gets down in the lower frequencies (my...

These are my port options. 8" x 24.6" - 277 Hz 10" x 40" - 168 Hz Is there a reason I can't use my BFD to roll off everything above, say 140Hz? My x-over will be at 80 or 100 depending on how it measures in-room.

Assuming both port ends are flared, is there a port velocity below which churfing can be avoided? I've seen this addressed in different ways and with different answers in several threads. On a related question, how far above the low pass freq is it safe to have the first port resonance in...

I have been modelling an LLT in WinISD, I'll probably go with the TC-2000 15" or the Adire Tumult 15d2. I still need to get a price on the TC-2000 to Australia, the Tumult sells for $1150 here. I have attatched some screenshots from WinISD for the TC-2000. I am using a 360l cabinet (22inch...

I'm sure this has been covered, but wanted latest update. What are the limits to the second port resonance frequency in terms of magnitude and frequency? Example: (sorry I don't have pic) A Steve LLT 15" RLP d2, 8 cu. ft., Fb 15hz, port 6.7" dia. Peak is at 140hz, not even 1 octave above normal...

Would somebody please tell me the resonance of an 80cu/ft sealed speaker box ,yes,80cu/ft(houses 2 x15''subs) I "have mislayed my books again,the wife decided to tidy my" special room "again <Dont you hate that>.thanks, kind regards alan