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RE: wideband shouting/beaming?

212.23.126.5

In Reply to: RE: wideband shouting/beaming? posted by protos on September 14, 2007 at 08:44:31

Hi,

best you wait for your wooden baffles, the material you used for your interims- baffles is not good, these baffles cause an early falling graph. The sound will change a lot with the right baffles, please keep us in touch! The placement and electronics seem fine (although i don`t know your pre- amp).

Regards
Robert Bastani

http://www.bastanis.com (Open in New Window)

Follow Ups:

RE: wideband shouting/beaming? - protos 15:37:55 09/15/07 (3)
On another matter.What is the impedance of the prometheus?It is not mentioned on the site.One review quotes 16 ohm 100db another just mentions the impedance of the tweeter 16 ohm and wideband 8 ohm.I am measuring around less than 4 ohms on my MM which should be about right.The tweeter measures 9.5 ohms separately and the wideband with the 12 ohm resistor about 4.2 ohms.I had the impression the prometheus were 8 ohm impedance.
- RE: wideband shouting/beaming? - Robert Bastani 22:41:56 09/15/07 (2)
  Hi,
  
  the nominal impedance of Prometheus is 8 Ohms. The widebands measure a minimum of about 6 Ohms, the Gemini tweeters are nominal 16 Ohms, the impedance- minimum is about 12 Ohms. Please send me a pic of the wiring of your baffles that i can have a look if it is wired ok..
  
  Regards
  Robert Bastani
  - http://www.bastanis.com (Open in New Window)
  - RE: wideband shouting/beaming? - protos 10:26:37 09/16/07 (1)
    I think everything is wired ok.The 12ohm is parallel ,wired to + and - of the wideband then the tweeter is also parallel to the wideband with the difference that the cap is in series to the + tweeter terminal.Mathematically speaking 8 ohms paralleled with 12 ohms is 4.8 ohms and this paralleled with 16 ohms is around 3.7 ohms.Correct?Or I am doing the calculations wrong?
    - RE: wideband shouting/beaming? - Robert Bastani 22:42:16 09/16/07 (0)
      Hi,
      
      from your description the wiring seems to be ok.
      The impedance of speakers is always impedance vs. frequeny, the curve is rising and falling - measuring the connectors of the drivers without signal shows the minimum impedance only.
      The drivers doesn`t work in parallel, they are separated by the crossover. In the crossover- region the impedance of the widebands is relatively high and the series caps of the tweeters rise the impedance for the tweeters to lower frequencies. The paralleled resistors flatten the impedance- curve to offer tube- amps optimized conditions.
      
      Regards
      Robert Bastani
      
      http://www.bastanis.com (Open in New Window)

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