Initial thoughts, MLTL FE167E's

[petercom]

If the enclosure is a closed box, TL or QW then you are right, stuffing loosely in the volume is the answer (though theoretically QWs need very little stuffing if you want them to behave like proper QWs). Bass reflex cabs, though, need lining.

[Scottmoose]

Good point. I should have stated QWR -BR boxes etc I haven't really spent any time with. I only use stuffing to damp harmonic resonances -0.25lbs ft^3 should do in the upper 2/3 or so of the cab is about my limit now. I like the look of the new WD25 floorstander though. Sort of a double aperiodic, like a double BR box in a way. The credit card is in for a battering...

Cheers
Scott

[Paul Welsby]

OK gentleman,

Realising that this is the first pair of speakers that i have ever built, is the first single driver speaker that i have ever heard, and is only the second pair of speakers that i have heard driven by valves (i dont get out much!).

How will i know if i have over/under damped my pipe! (that sounds like something franky howard would say !?!)

Paul

P.S. I get off the rig on the 6th so should have these little babies singing by about the 10th! Really looking forward to it.

[petercom]

Damping is a suck it and see approach (unless it is fully under design control as in the WD25 aperiodics). All you have to do is listen to a double bass or bass guitar playing a range of notes and see if it is even in intensity all the way down. If it booms add more damping. If the bass sounds too dry, lacking in energy, then reduce the damping.

[Roy Lewis]

Where stuffing is concerned, for TL's - aperiodic/closed box, an interesting choice is " Thermafleece ", at, " WWW.secondnatureuk.com ". This pure wool batting, the site has some interesting info. It comes in three thickneses 50-75-100mm, if too thick it can be easily pulled apart. Wool seems to a favoured stuffing material, so this looks a good choice for lining cabinet walls/centre stuffing, aperiodic ports, etc. Worth a look.

Roy

[petercom]

It won't do for aperiodic ports - you need something with much higher, and predictable, air flow resistance such as compressed glass fibre or the reticulated foam we use on the WD25.

World Designs Soniqs CDF is, like wool batting, an open fibrous tangle and can easily by pulled loose for TL filling etc.