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In Reply to: RE: sims for a TQWT for a JBL D-130 ? posted by freddyi on August 26, 2007 at 10:11:25
thanks!
Follow Ups:
what are you trying to do other than reach 50Hz acceptably? :^)
here's RCA-Fan's V-vent reflex outdoors with mic laying on ground at 2M - it and his hitbox plans are featured in his AA Gallery
RCA-Fan "Hawaii box with M151 and heavy cone B&C
hi,
I know this is a horndriver and work best in hornload.
I have tested it in a jensen ultraflex cab (about 6-7 cub feet? 180L
very low level on bass output below 100hz.
Just wanne build a cab that is tall and not so wide and with bass enough to listen to rock,blues and jazz. 40hz -6db? my room is 5*4*2,4 meters and I gonne place them in a corner.
with a simple 800hz horn on top.
they sound very good in the middle and they are 102db and I have these laying around and dont know if I could use them or build a guitarbox for them.....
I have a SE2W 46"tube amp and a 10w T-amp.
Maybe add a tabletuba later but I really wanne make a simple 2-way first.
I've got nasty flu or something bad but even on good day not sure what's best for this type driver. IIRC RCA-Fan showed it in a big (~10 cubic foot) reflex tuned to ~50Hz. There should be workable rear horn. If were put into regular Karlson a mild lift would occur from ~60-200Hz.ask over at DIY Audio - should be someone itching to flex their MJK worksheet skills :^)
M151 wasn't too bad in Karlson box with slotted tube or horn on top but might not go low enough for you - I like punch and will take that over "low" - sometimes.....
With its low Qts the D130 is not well suited at all for a TL. Best results come with drivers that model well in sealed box alignments.
Hi Bill thanks for responding,
What I wanne build is a voighthorn or a conical pipe about 1,8-2,4 m with a start at 0,7 of the conearea and about 3 times bigger at the end but with a reduced outlet so I can tune it in to the room.I like to place the driver at 1/3 of the length
Is this not a good idea with a low Qt driver ?
"What I wanne build is a voighthorn or a conical pipe about 1,8-2,4 m with a start at 0,7 of the conearea and about 3 times bigger at the end but with a reduced outlet so I can tune it in to the room.I like to place the driver at 1/3 of the length
Is this not a good idea with a low Qt driver"A 2m pipe can take you down to 50 Hz easily enough but not with that low a Qts. Think of a tapered line as the inverse of a horn, in both the direction of the taper and the suitability of the driver. Low Qts high sensitivity drivers work well in horns, high Qts low sensitivity drivers work well in tapered pipes. The better the driver models in a horn the worse it is in a TQWP, and vis-versa.
for an 8 cubic foot bulk and home use would you consider a TL with 0.6-0.7 qts to be a good tradeoff vs Table Tuba with appropriate driver?
"for an 8 cubic foot bulk and home use would you consider a TL with 0.6-0.7 qts to be a good tradeoff vs Table Tuba with appropriate driver?"
You could certainly get the fp equivalent to the TT fc, as from the same size box you can get the same 14 foot path length either way, what differs is the positive taper of the horn versus the negative taper of the TQWP. The tapered pipe would have a much flatter response curve, but with far less sensitivity. With the power and excursion demands down low I'd rather have the sensitivity.
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