High Efficiency Speaker Asylum

Any 15 with 96db for a f3 of 50 hz in a sealed box

69.206.46.167

merdy

I have some old 3 cuft cabinets and a 5 cuft cabinet
New modern drivers preferred
Thanks in advance
Silence is golden duct tape is silver

Follow Ups:

RE: Any 15 with 96db for a f3 of 50 hz in a sealed box - imagon 06:19:42 06/03/24 (0)
The new Faital Pro 15PR300 should be perfect
RE: Any 15 with 96db for a f3 of 50 hz in a sealed box - freddyi 23:16:33 08/04/23 (5)
same answer I gave at DIY = ASSUMING a solid state amplifier with low output impedance

maybe try a 3rd order box - you ran run the numbers for this woofer using hornresp -play with stuffing density

Karlson Evangelist
- RE: Any 15 with 96db for a f3 of 50 hz in a sealed box - KanedaK 22:19:37 08/12/23 (1)
  Ahhh, PRV! :-)
  
  I'm using their D2200PH midrange driver on their WG45-50 horn in my main system: it costs close to nothing, sounds fantastic and measures great!
  
  Glad to see they have other interesting products
  - RE: Any 15 with 96db for a f3 of 50 hz in a sealed box - freddyi 01:42:10 08/15/23 (0)
    That's great on the waveguide - I'll assume it works better than the ones sold by "XYPC". What's your crossover F and slope? Would the combo work comfortably in a La Scala type situation with just a cap roll-on?
    The prices even pre-hyper-inflation for K55 diaphragms was crazy - I'm surprised a Chinese vendor didn't step in with aftermarket Klipsch midrange diaphragms.
    
    I'd like to see those measurements !
    Karlson Evangelist
    
    Edits: 08/15/23
- That is very clever but I have a few questions - merdy 11:28:30 08/06/23 (1)
  After adding the cap to the woofer and now and then a simple 6 db crossover for the tweeter does the phase remain the same
  What happens when I then use a inductor at the crossover knee?
  
  Not a big fan of the logo
  
  Nice to see you post and hopefully your health is holding up
  
  Silence is golden duct tape is silver
  - RE: That is very clever but I have a few questions - freddyi 02:07:42 08/13/23 (0)
    where does the "tweeter roll in" ?
    
    2mH just flattens it more
    
    Karlson Evangelist
- RE: Any 15 with 96db for a f3 of 50 hz in a sealed box - Bill Fitzmaurice 04:57:20 08/05/23 (0)
  That's pretty good, Fred. I wouldn't have thought of it, as it needs a 35 cu ft box for maximally flat response.
How about a 12? - Paul Joppa 16:37:56 08/04/23 (3)
Fostex FW305 should do 95dB in 3 cubic feet, with QT=0.5 at 50Hz, but a zero-feedback SET will bring the QT up to around 0.7.
- RE: How about a 12? - Bill Fitzmaurice 18:05:36 08/04/23 (2)
  The best f3 you'll get with the FW305 in a sealed box is 75Hz, with broadband sensitivity of 93dB.
  - RE: How about a 12? - Paul Joppa 21:20:29 08/04/23 (1)
    That's perfectly true, if you use an amp with a high damping factor and/or a lot of wall absorption. My interest is in SETs, which usually run a DF around 2 to 3, so I added that calculation.
    
    And you're right about the efficiency too - I mistakenly applied a 20xlog efficiency calculation instead of 10xlog to the claimed 1.4% 2-pi efficiency. So yeah, 93.5dB/m/W. The spec sheet claims 95dB, which seems to be in the 800-2000Hz range, well above piston behavior and only on axis.
    
    I stand corrected.
    - I have added a 1 ohm resistor to the drivers and it helps with some set amps - merdy 11:34:13 08/06/23 (0)
      I did model the foster 12 and 15 but they drop around 60 hz
      So plan b
      
      P.s the vsac show in 2001 was the best thing ever
      Silence is golden duct tape is silver
maybe (???) with a really, REALLY big sealed box (infinite baffle) - mhardy6647 11:08:56 08/04/23 (1)
Maybe.

Get someone to put an Altec 515B in a 20 or more ft^3 box and measure it, or do some sims.

all the best,
mrh
- Altec 515B - Bill Fitzmaurice 11:37:17 08/04/23 (0)
  No matter what size sealed box you put it in an Altec 515B f3 will never go lower than 115Hz. With a Qes of 0.18 you couldn't find a driver less suited to a sealed box or IB than the 515B if you tried. It would suit the OPs needs in a 5 cu ft net ported cab tuned to 50Hz, though a modern driver like the Eminence 3015LF would work even better in 4 cu ft net box, also tuned to 50Hz.
RE: Any 15 with 96db for a f3 of 50 hz in a sealed box - Bill Fitzmaurice 09:08:59 08/04/23 (0)
I'm confident the answer is no. You can get that ported, but not sealed.

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