If there is a standing wave inside an enclosure, what is the best way to eliminate it without changing too much of the design? I put my measurements into an online calculator and it shows me that i have a standing wave at 5,9khz.
A quick browse of the web tells me that stuffing (Polyfill / Fiberglass) will help reduce it. As far as I'm concern, stuffing with polyfill lowers Q and make the drivers think that it is in a bigger enclosure than it actually is. Since if my driver got a bigger enclosure the cone excursion will be too high, will stuffing my enclosure with polyfill effects the cone excursion? Thanks!
A quick browse of the web tells me that stuffing (Polyfill / Fiberglass) will help reduce it. As far as I'm concern, stuffing with polyfill lowers Q and make the drivers think that it is in a bigger enclosure than it actually is. Since if my driver got a bigger enclosure the cone excursion will be too high, will stuffing my enclosure with polyfill effects the cone excursion? Thanks!
I tried - wodendesign.com is no more! Your and Scotts' accounts aren't accepting messages on here, or I would send you my email that way. Other options?
I missed renewing the woden domain by a few days. I renewed it, but just now fixed the name servers that change on expiry. It should be back up shortly.
You can also email me.
Dave
You can also email me.
Dave
At 5.9 kHz it should be easy to kill the standing wave with damping.
That is a pretty small box dimension?
dave
That is a pretty small box dimension?
dave
Only if you so heavily over-stuff the box that it effectively becomes a solid mass and causes volume reduction, or place large quantities in immediate proximity to the driver, sufficient to mass-load the moving components.
Click on Dave's (Planet10's) user name, and from the pop-up menu select 'visit my homepage'. Then on his homepage click on 'mail us' (bottom of the menu on the left). Job-jibbed.
If vented, damping reduces the vent's ability to limit excursion around tuning [Fb] as it moves closer to ~aperiodic, so can be [quickly] over driven if not low pass filtered.
Good point (like that needed saying 😉 ). I hold my hands up: I ended up learning that one the hard way. The B20 in question did not survive the experience. 
I'm not proud of it -you taught me better than that. On the other hand, it was a lesson I won't forget in a hurry, so on the whole, a positive...
I'm not proud of it -you taught me better than that. On the other hand, it was a lesson I won't forget in a hurry, so on the whole, a positive...
Yeah, learned most of what I know the hard way too . 🙁 A shame I didn't have 'second sight' as many of the drivers would be quite desirable nowadays on this forum.
Yeah, I think we'd all like one of those crystal balls from time to time. 😉
I saw a pair of NIB 1354s go the other day for over $100. I may weep. 😱
I saw a pair of NIB 1354s go the other day for over $100. I may weep. 😱
$100? Nuts.
I think i gave my last pair away. I got a whole bunch in the end days for $5 each.
A good driver, but…
dave
I think i gave my last pair away. I got a whole bunch in the end days for $5 each.
A good driver, but…
dave
What is Sd? 3.2 mM means millimeter to me, but can't be right, though 32 cm^2 seems about right, so curious if this is a typo or LMS wrong? [I find this hard to believe]
OK, thanks, but before posting I looked at a few different TB W3 drivers and 32 cm^2 was the norm, lining up with the '3.2 xx' spec and 27 cm^2 for 'sub' woofers. When I get HR updated I'll plug in the LMS specs to see what's what.