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New sub design? Constricted Transflex, simple build (series tuned 6th order)
New sub design? Constricted Transflex, simple build (series tuned 6th order)
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Old 14th September 2018, 11:14 PM   #2181
Matthew Morgan J is offline Matthew Morgan J  United States
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Freddi ,

That JBL 151 model is tuned far too low for a driver with such a high sensitivity and such a small amount of linear excursion available, it wouldn't likely sound balanced, probably too dry and lean ...... That model should be tuned somewhere in the 70hz to 100hz range in order to increase the mechanical power handling, provide better tonal balance and also to have a respectable amount of output before distortion sets in ..
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Old 14th September 2018, 11:33 PM   #2182
freddi is offline freddi  United States
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New sub design? Constricted Transflex, simple build (series tuned 6th order)
JBL rated M151 with "5mm" xmax - how they rated = ? How should the model be re-tuned higher without further scaling? (unless smaller is better) - Could a Karlflex in this size range with proper selection of driver and tuning be competitive with kickbins of similar size? - - or are other approaches more suited for that duty ?

Last edited by freddi; 14th September 2018 at 11:40 PM.
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Old 14th September 2018, 11:48 PM   #2183
Matthew Morgan J is offline Matthew Morgan J  United States
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Quote:
Originally Posted by freddi View Post
JBL rated M151 with "5mm" xmax - how they rated = ? How should the model be re-tuned higher without further scaling? (unless smaller is better)
Ok, yes your right, 5mm is the published figure ......The gap on that driver is almost just as deep(12.7mm) as the voicecoil winding is long(15.2mm) but with the current formula for calculating Xmax it does work out to about 4.42mm one-way ..

Freddi, do you have a response curve for that 151? Is it "bright" sounding?

The cabinet can be tuned higher by adjusting the model manually, the "scaling" feature is just too easy .

Last edited by Matthew Morgan J; 15th September 2018 at 12:04 AM.
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Old 14th September 2018, 11:58 PM   #2184
freddi is offline freddi  United States
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New sub design? Constricted Transflex, simple build (series tuned 6th order)
dunno if I still have a curve for M151 - IIRC it played a bit bright in K15 with a crossover of 1K6 - not terrible and I had strips of masking tape on its aluminum dustcap

since anything built can only be used in my house or yard, then there's need to at least reach the low end of a cello plus should be able to reach a K-tube tweeter.

15pzb40 has 5mm of physical coil overhang and is rated "8mm" xmax

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Old 15th September 2018, 08:47 AM   #2185
freddi is offline freddi  United States
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New sub design? Constricted Transflex, simple build (series tuned 6th order)
just thinking about "kick-bins" CUBO's Kick15 looks like a best contender but PWK's "little bastard"/"LB76" could be vented and re-purposed as one. The small LB76 vent in the sim below would have to choke at higher power and guess a bit more cabinet height would accommodate a better vent.

my sims may not be the best

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LB76 - nice as provides some protection from weather. Someone meeds to adopt the little bastard ;^)

Tony Reed built his LB76 with the "rubber throat" while the patent showed a throat opening double that size:

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Last edited by freddi; 15th September 2018 at 08:58 AM.
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