Decwares wicked one sub...

work to the inside of the line, disregard the 45 deg line in the orange circle of randomness, never worked it out why the plans say that but built 3 of these now and its always been slightly off, using the other 2 lins seemed logical, id always assumed it would meet up if it was made 24" deep but obivously not, i'll be interested to hear your opinions on it once youve built it.

 

 

I wonder what would happen if you put the 12" LAB drivers in these... just a thought... anyone tried it? 

@tbmike, at LF what matters is the effective mouth size (make it equal to frontal area) and the length of the cab becasue the resonance dominates it. At the spot where the piece narows, all modes with a pressure peak will be less affected and where there is a velocity peak it will be slightly damped, though this will get a little hairy to really model.

Perhaps see what happens when you take the effective helmholz frequency predicted by hornresponse when modelling the first triangle purely as a front chamber and doing a band-pass. Overlay this on a hornresponse plot with a larger front chamber and horn length a little shorter that front-back of the two triangles and look where there is a velocity peak at the narrowing bit (paper modal analysis) which will presumably be more damped.

Signing off (long time no see, too busy)

Martin

still meaning too, need a mic , got smaart live. somoen was saying the other week that they had never heard the system check track where the 37hz bass tone was louder than the 60hz bass tone and that was with 8 labs or somethin, made me laugh as thats the only way ive heard it :)

i reckon if your trying to do semi pro rig hires and small festivals and have cash, yea build a pile of labs, the theory behind them is very sound and they definately work. for free partys though you definately do not need 4-6 of these to get low, the thought of 6 of them makes me grin and cringe at the same time as it would destroy any given venue in sheffield as far as im concerned, not literally but the crowd would definately know about it.

its not just the lowness thats good about these things its the way they deliver the bass, low thuds are stupidly punchy, you can argue the physics of this box is all wrong, it is, thats another reason why i love em, they shouldnt work but they do, they work well with most stuff ive played through them over the past 2 years of living with one in my home stereo . which i also reccomend them for

@james/rich ind. st.  and  those in the Know

just wondering if you had any thought's on putting some of these celestions in a 15 verson of the WO, given the difficulties on modelling it? 
http://professional.celestion.com/pro/products/pdf/TF-1530.p df

Their output looks a little miserable below the 40 - 88 db but how about two, there's not much info on how it was measured.

the reason i ask is that their just under 50 quid a go, and i have some spare wood at the mo and free channel on a pv2600.

it would only cost me 110 for materials, hhmm

Nice one Rich cheers for the info, I'll look into other drivers and lol yes the clue was in the question: i'll be looking into car drivers too!

I've been trying to find out if its only the 18inch celestion [as immortalised by the usb bin] that's worth having, will report back soon.

Let us know how it goes tnite, especially the compliant radius [3.5 ffffookin miles!! mwmwmwhahahaha!!!]