mustang guy Posted April 8, 2016 Share Posted April 8, 2016 So rambling on, no sub user can post input volts to one box/unit and the output in SPL at 22 Hz? I would, but I don't have an F20. Have you tried posting the question on the lilmike F20 thread? mach-1, you can probably just look at the efficiency of the driver you are using as compared to the drivers you are wanting to compare against. The numbers should be relatively close. for example: rss460ho = 93db rss390ho = 92.8 lab15 = 88.5 Hey Jason, the LAB15's are on blowout on PE. I might nab a couple and build a pair of T-60's instead of T-30's. http://www.parts-express.com/eminence-lab-15-4-15-pro-audio-subwoofer-speaker-4-ohm--299-391 Driver sensitivity means very little in these horn loaded subwoofers, using this method will not give an accurate measurement. You are wrong my friend. Driver sensitivity always matters. Sorry to disagree... Edit: messed up the quote a bit but refer to post #17 Nothing to be sorry about, let me explain why your theory is wrong. Driver sensitivity means very little, frequency response will vary wildly from driver to driver within T/S parameter range of the design. Throw one in the mix that is pretty far out of T/S range and your frequency response will not even be in the same ballpark. This is why comparing by sensitivity alone will not be accurate. I suppose you're right. I remember something to the effect that the air displacement is more important than efficiency in a horn. Quote Link to comment Share on other sites More sharing options...
jason str Posted April 8, 2016 Share Posted April 8, 2016 (edited) Tuba 60's would be perfect if you really want to shake your shop and they are able to dig lower than the other pro series horns. If you do decide to build some Tuba 60 cabinets keep in mind they will be nearly as big than your 2 THT's stacked on one another just to give you an idea of how large they are. Edited April 8, 2016 by jason str Quote Link to comment Share on other sites More sharing options...
Quiet_Hollow Posted April 8, 2016 Share Posted April 8, 2016 (edited) So rambling on, no sub user can post input volts to one box/unit and the output in SPL at 22 Hz? At the moment I've got a half-width (15" wide) Tuba HT subwoofer loaded with a 12" driver (Dayton DVC 310-88). Corner-loaded and using a Radio Shack SPL meter set to "C weighting / slow" with a 20 Hz test tone from the Bink CD, the unit measures 100 dB SPL on 2.87V at 6" from the mouth. I also measured what voltage it took to maintain 100 dB SPL, one meter into my room. Edited April 8, 2016 by Quiet_Hollow 2 Quote Link to comment Share on other sites More sharing options...
jason str Posted April 8, 2016 Share Posted April 8, 2016 Good to see you back Tom, i was wondering where you have been. 1 Quote Link to comment Share on other sites More sharing options...
Axz Hout Posted April 8, 2016 Author Share Posted April 8, 2016 R Quote Link to comment Share on other sites More sharing options...
JohnA Posted April 11, 2016 Share Posted April 11, 2016 Are you aware that the Radio Shack meter needs to be corrected +7.5 dB at 20 Hz? http://www.subwoofer-builder.com/SPL-corrections.htm 1 Quote Link to comment Share on other sites More sharing options...
jason str Posted April 11, 2016 Share Posted April 11, 2016 Good information John, 7.5 dB is a huge difference in output. Quote Link to comment Share on other sites More sharing options...
CECAA850 Posted April 11, 2016 Share Posted April 11, 2016 Are you aware that the Radio Shack meter needs to be corrected +7.5 dB at 20 Hz? http://www.subwoofer-builder.com/SPL-corrections.htm I'd be shocked if he didn't. 1 Quote Link to comment Share on other sites More sharing options...
jason str Posted April 11, 2016 Share Posted April 11, 2016 but what plans did you build from that called for an 18? Well by changing the width the box can be used with 12 , 15 and 18 inch motors. Standard build is 20 inch wide. Just wondering what input/volts is used to get 100 dB at 22 Hz with the multiple possible drivers being used, most with the standard driver being an obsolete 15 inch car/sub motor. There are many great drivers available for the design that are not obsolete. 1 Quote Link to comment Share on other sites More sharing options...
Axz Hout Posted April 16, 2016 Author Share Posted April 16, 2016 E Quote Link to comment Share on other sites More sharing options...
jason str Posted April 16, 2016 Share Posted April 16, 2016 (Dayton DVC 310-88) That woofer is no longer available, but at at with 89.8 dB sensitivity it is not a horn driver. You would have to feed it ALOT of power to keep up with the Klipsch LaScala! Driver sensitivity means very little in these designs. Quote Link to comment Share on other sites More sharing options...
Axz Hout Posted April 16, 2016 Author Share Posted April 16, 2016 Y Quote Link to comment Share on other sites More sharing options...
jason str Posted April 16, 2016 Share Posted April 16, 2016 (Dayton DVC 310-88) That woofer is no longer available, but at at with 89.8 dB sensitivity it is not a horn driver. You would have to feed it ALOT of power to keep up with the Klipsch LaScala! Driver sensitivity means very little in these designs. If you had LaScala main speakers. the Heresy will not keep up as rear surrounds. I agree A sub with a 89.8 dB motor will be lost in the crowd. If you give it enough power to keep up it is always causing more distortion. This relates to direct radiating subwoofers, horns are something completely different. Quote Link to comment Share on other sites More sharing options...
The Dude Posted April 16, 2016 Share Posted April 16, 2016 (edited) The question was what how many volts other sub users needed to get 100 dB at 22 Hz Not an f20 or a single driver unit. But my spud clone single cab running dual 8" takes about 9 volts to push 22 hz from youtube to 100 db. That is about 12' away from the measurement mic. Edited April 16, 2016 by duder1982 1 Quote Link to comment Share on other sites More sharing options...
mustang guy Posted April 16, 2016 Share Posted April 16, 2016 (Dayton DVC 310-88) That woofer is no longer available, but at at with 89.8 dB sensitivity it is not a horn driver. You would have to feed it ALOT of power to keep up with the Klipsch LaScala! Driver sensitivity means very little in these designs. If you had LaScala main speakers. the Heresy will not keep up as rear surrounds. I agree A sub with a 89.8 dB motor will be lost in the crowd. If you give it enough power to keep up it is always causing more distortion. This relates to direct radiating subwoofers, horns are something completely different. This relates to direct radiating subwoofers, horns are something completely different. A horn is a passive amplifier. Quote Link to comment Share on other sites More sharing options...
Coytee Posted April 16, 2016 Share Posted April 16, 2016 If you had LaScala main speakers. the Heresy will not keep up as rear surrounds. A sub with a 89.8 dB motor will be lost in the crowd. If you give it enough power to keep up it is always causing more distortion. Put differently from how Jason worded it (if I may), you are comparing the output of a speaker (Heresy) against a speaker verses the output of a driver against a speaker. I'd think your reference point is incomplete because your driver (me not knowing anything about it) could be direct radiator mounted like a Cornwall or horn mounted like the LaSCala. (meaning both speakers use same driver for a big difference in outputs) We might have to ask Mr. Owl as this might become the worlds 2nd most enigmatic question. Quote Link to comment Share on other sites More sharing options...
Axz Hout Posted April 25, 2016 Author Share Posted April 25, 2016 W 1 Quote Link to comment Share on other sites More sharing options...
Axz Hout Posted April 25, 2016 Author Share Posted April 25, 2016 Y Quote Link to comment Share on other sites More sharing options...
Axz Hout Posted May 20, 2016 Author Share Posted May 20, 2016 F Quote Link to comment Share on other sites More sharing options...
jason str Posted May 20, 2016 Share Posted May 20, 2016 Funny. The Spud should play right along with the La Scala until they run out of steam or make you deaf, witch ever comes first. Quote Link to comment Share on other sites More sharing options...
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