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VOTT Cabinet Efficiency Increase

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Can a VOTT cabinet efficiency be increased over 100DB? Currently using an Altec 416 woofer which gives about 100DB. Would like to boost this to 105 db or more efficiency. See a few pro woofers rated at 103 db without horn loading. Can these work in the VOTT cab’s? Or any suggestions?

TIA

Follow Ups:

Place sub in reflex space - Rafaro 13:44:39 09/03/07 (0)
See discussion in Altec unofficial years back...look under sub for 825 cab under a guy called Roland if I remember correctly. Also try putting a Bill FitzMaurice sub in that space have not tried it but they are small and highly efficient. Bill may suggest a specific model which would fit. Hard to beat the midbass horn of that cab combined with a sub for a full range cab with balls!!!
RE: VOTT Cabinet Efficiency Increase - WLB 11:46:11 09/01/07 (0)
The efficiency of the 416 woffer is 97 db 1w/1m. In the VOTT cabinet it comes out to 103dbs. The VOTT cab. is reported to have a 6db gain for any 15" speaker you put in it.The 515 woffer is 99 db so should come out to 105dbs.I never had a sound pressure meter when I used my VOTTs so I don't know how accurate it is . But Altec was usualy quite conservative in its specs. I only know they are capable of going loud enough to damage your hearing with eather woffer and a 30 watt per channel amp. I would stick to Altec speakers in them ,my personal prefferance of course.
RE: VOTT Cabinet Efficiency Increase - Bill Fitzmaurice 08:43:28 08/31/07 (0)
"See a few pro woofers rated at 103 db without horn loading."

Sure, at 2kHz. You can't go by the raw SPL rating, you must look at the SPL chart on the manufacturer data sheet. OTOH, there are quite a few drivers that could offer significant improvement where the 416 falls short, below 100 Hz. You'd have to model the reflex section to find what would work best, with adjustment to the port size as required.
RE: VOTT Cabinet Efficiency Increase - Tom Brennan 08:31:27 08/31/07 (4)
An Altec 515 woofer is more sensitive than the 416. IME the 515 (515B)will give you a little better midrange but less bass depth.

Note that the 825-828 VOT cabinet gives a stepped response with the horn loaded region above 125-150 hz several db higher in sensitivity than the region below which is vented. With a 416 woofer you may well be up around 105 db above 150hz.
- RE: VOTT Cabinet Efficiency Increase.....perfect timnig. - drummerwill 19:13:51 08/31/07 (3)
  I was just searching the web looking for a drawing of a A-7/ 828 cabinet.
  While listening to my A-7's with a sub. I got down to listen to the vent port to see how much low end was coming out. I was surprised to hear so much volume but sounded boxy and sloppy.
  Then I had this hairbrain idea to make the lower part of the cabinet into a scoop like BLH. I've got a pair of Altec 805's in BLH that sound pretty good. I like the bass in that BLH very smooth and deep.
  What do you guys think would there be any advantage to Scoop-ti-fying the the A-7 cabinet?
  
  Have fun
  Willie
  - RE: VOTT Cabinet Efficiency Increase.....perfect timnig.-Been there done that - Ivan Beaver 11:39:02 09/01/07 (1)
    I did the exact same thing around 25yrs ago. The application was PA usage for sidefills. There was no "science" behind it, but I did not use the front panels on the cabinet.
    
    I simply expanded the area under the driver downwards to the bottom and then back up for the full now open area on the bottom of the cabinet.
    
    The only thought was to keep the "horn" expanding. It sounded fine, but I have no real information on performance, so no comment on the idea, except it worked for me, but I'm sure there were all sorts of issues with it.
    - RE: VOTT Cabinet Efficiency Increase.....a photo - ivanbeaver@comcast.net 11:51:02 09/01/07 (0)
      Here is a photo I found of the cabinet in question. They are the bottom cabinets on each end.
      
      Edits: 09/01/07
  - No... - eso 20:18:13 08/31/07 (0)
    Either extensively brace the cabinet, resize the vent and add some additional damping inside, or use the lower section to install an 18" driver as a sub.
    
    I think Tom has some experience with the both of those approaches, so he could elaborate on the 18" idea.
    
    Why reinvent the wheel? If you want a scoop cabinet, build the old JBL PA scoop design. Those still really only work to 40-50Hz. To go deeper you need something altogether different.
    
    eso

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