Eminence Beta 12LT system

[felixx]

The 3 cuts,like an old reel to reel is a good option,but is not good to be that large.
Lower fs without reducing spl.

Is interesting how the Fertin make the "old school" technique to be so proper implemented.

http://www.diyaudio.com/forums/showthread.php?postid=1422543#post1422543

 

[eljoantonyn]

A question - does a tweeter with a high crossover point damage imaging?

I'd hazard a guess myself and say "not much", as I've found that above a certain frequency it becomes harder to localise a source (much like as you go lower down in frequency below 100Hz or so)

Is this a sensible line of reasoning?

If I had more money I'd just go for a coax but I want to keep this relatively affordable.

I have the same question !

I think you could get music out of 12LTA - I put on in an old one-fold t-line then opened the vent by ear until it sounded like it was alive - -

for reflex, RCA-Fan's v-vent type with maybe 140-170 liters might work - the edge of the v is gapped aobut 1.5" from rear of box to form a lowpass choke

Eminence's old B102 made a good fake Druid - maybe the new one would work too - who knows if Zu's custom woofer has lower qes (?)

12LTA probably has better tone and somewhat more extension than B102 plus are $50 in US - it extends about as far as EV SP12 (alnico)

I'd like to hear Planet10 BVR for 12LTA - I'd like one for Eminence c12cx

here's a messed up t-line and picture of RCA-fan's v-vent type box - I think this is the one whose plans appear in RCA-fan's high efficiency gallery and I have one loaded with coax.

http://img136.imageshack.us/img136/3488/si1xl0.jpg
http://img240.imageshack.us/img240/8308/vventhalfhorn515bwh5.jpg


here's a couple of on-axis graphs of 12LTA - ignore those lower F dip
http://img341.imageshack.us/img341/8360/arb102vs12ltnu7.jpg
http://img245.imageshack.us/img245/9466/onoffwim9.jpg

Very interesting.

 

[freddi]

if you look hard in this gawdawful mess, there's a Karlsonator12 with 12LTA - its very good and worked well with Nirvana Super10 and should work well with a variety of 10" and 12" coax. It even sounds good with the way cool Fane 250 double whizzer cone speaker but I know it must be peaking in the upper bass as that woofer's qts is suitable for open baffle work