High Efficiency Speaker Asylum

VOT A7 systems sensitivity?

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used-hifi

Having looked in the net (Google) and not really finding what I'm looking for

What are the sensitivity of the big altec VOT A7 systems?

Thanks

Lawrence

Follow Ups:

102dB - Bill Fitzmaurice 07:27:51 09/11/16 (7)
102dB/1m is the usual figure given. Altec called it 101dB at four feet.

Edits: 09/11/16 09/11/16 09/11/16
- RE: 102dB - Alpha Al 11:38:10 09/11/16 (6)
  Those had a passive Xover with an L-Pad HF attenuator.
  
  Where is that set when the sensitivity measurement is made?
  
  Just curious how that comes into play.I always thought they sounded best with the HF control set a little less than halfway.
  - RE: 102dB - Bill Fitzmaurice 12:45:12 09/11/16 (5)
    I assume it was with the HF and LF level matched. The link says measured with pink noise 500-3kHz, which means with the 500 version it's all HF horn, the 800 mostly HF horn, and they'd have to be padded quite a bit to be at only 101dB/4ft. I've seen SPL charts for the A7, they all show the HF/LF sections level matched.
    - RE: 102dB - horn kid 03:28:45 09/12/16 (4)
      With my controls set for best frequency response 50 to 10k I get minimum 101 db / watt. 802 / 811 / 416, 16 ohm.
      
      As far as settings on the xovers, that can vary from xover to xover, Altec made changes along the way. The settings will also depend on your room and your system balance.
      - RE: 102dB A447 vs VOT - freddyi 03:44:16 09/12/16 (3)
        
        In Reply to: RE: 102dB posted by horn kid on September 12, 2016 at 03:28:45
        
        cool - I have 811, 511 and some Altec drivers laying around - maybe for fun i can mate a 511/806 combo with EV's Sentry IV
        
        here's a graph I got a long time ago from Paul Klipsch of La Scala (and K-horn) vs a VOT
        
        I'd wonder how a VOT would sound side by side in an A-B comparison with LA Scala?
        
        Karlson Evangelist
        
        RE: 102dB A447 vs VOT - Hornlover 08:23:10 09/12/16 (2)
        
        In Reply to: RE: 102dB A447 vs VOT posted by freddyi on September 12, 2016 at 03:44:16
        
        The VOT sounds better on the low end than the LaScala. More extended. I like the Altec 802 and 511 combo better than the mid horn on the LaScala as well.
        
        RE: 102dB A447 vs VOT - freddyi 13:47:54 09/12/16 (1)
        
        In Reply to: RE: 102dB A447 vs VOT posted by Hornlover on September 12, 2016 at 08:23:10
        
        my K-horn has an "indistinct" region - not sure if a timing issue between the bass and midhorn - or something else. 511b makes a good midhorn in 3-way horn setfups. What are the coil and cap values on your VOT crossovers? - any attenuation?
        Karlson Evangelist
        
        sounds like the 200 to 400 Hz suck-out to me ...~nT - Cleantimestream 18:02:49 09/12/16 (0)
        
        In Reply to: RE: 102dB A447 vs VOT posted by freddyi on September 12, 2016 at 13:47:54
        
        ~!
        The Mind has No Firewall~ U.S. Army War College.
RE: VOT A7 systems sensitivity? - freddyi 20:35:04 09/10/16 (2)
my gut guess would be for half space ~98dB in the area below the horn's cutoff rising somewhere to 105dB
and this input of an A7 with port area blocked to 1/2 I nabbed somewhere shows pretty much that region - not sure if that's a 515 or 416
put a modern HF on the horn, damp the horn, etc. IIRC Tom Danley has some suggestions for this classic

Karlson Evangelist

Edits: 09/10/16
- RE: VOT A7 systems sensitivity? - Sidewinder 21:06:14 09/10/16 (1)
  Hi Freddyi,
  I've heard of people mention and praise Danley's VOTT mods but nobody can recall any specifics. Do you have any info you can share?
  Regards,
  David
  
  Edits: 09/10/16
  - RE: VOT A7 systems sensitivity? - freddyi 21:54:17 09/10/16 (0)
    no - i didn't keep up with Tom's posts - if he's mentioned specifics then those should be pretty easy to find - or he'll chime in and give them.
    Its sounds like he really gets the old A7 going - I've only heard one A7 on one channel in the early 1970's in a small room of the late Don Nicol's "High Fidelity Center" in Huntington, WV and that particular A7 sounded like its highs only went to around 10K. .I was only around 6 or 7 feet back so things didn't fully integrate
    here's one post from 2009 Getting around to the subject but
    I can't find anything concrete - but here's some lore on Using light bulbs for protection
    Karlson Evangelist
    
    Edits: 09/10/16

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