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RE: Beaming/shouting

Posted by Robert Bastani (M) on April 23, 2009 at 23:46:55

In Reply to: Beaming/shouting posted by prots on April 22, 2009 at 01:25:53:

Hi,

the problem of rusty baskets is not common, the widebands are produced to common Eminence standards, you are the only one who reports this problem. There are other customers living at the sea, no problems with the baskets.
The cone- treatments reduce the usual shouting/beaming of a 12"- driver to a non-disturbing minimum and allow the driver to play free from a crossover and limitations in the frequency- band.
I remember you live in humid tropical climate and i can imagine that when the baskets rust also the paper- cones show issues caused by humidity, paper is much more sensible to humidity than painted driver- baskets. To check this out i can send you a pair of new widebands for a comparison, when the shouting is much better with the new drivers i`ll offer you a reduced exchange- rate. When you agree please inform me about your new adress via p.m.

Regards
Robert Bastani

P.s.

Beside the essential issues with the cones i recommend to realize placement and setup following this method:


Baffle- placement:

First connect the amp with the baffle- section (wideband and tweeter) with your speaker- cables like you are used to connect any other speaker.
Now you can find the right placement for the open baffles, just listen to solo a voice with fully paralleled speakers, as much space inbetween the baffles as possible and move them away from the backwall until the voices rise in height, voices should be centered in the middle between the speakers (if not check if the speakers are exactly paralleled, move one baffle only two centimeters back and forth and listen until the imaging becomes right).



Woofer setup:

1) Phase settings: The right phase is essential for natural sound although the changes are relatively subtle.
- Switch one woofer amp "off".
- Rise the croosover frequency for the woofer to max. and also rise the volume a bit
- Turn the phase knob listening to music until the basses are maximum fat and boomy at listening position.
- Reduce the level and crossover to normal.

2) Crossover settings:
- Switch the woofer- amps "off" and listen to the imaging of the baffles only (choose a choir or a big orchestra).
- Switch the woofer- amps "on" and compare the imaging, reduce or rise the crossover-knobs (of both woofer amps, both always the same frequency- settings) to the highest possible frequency which doesn`t affect the imaging of the baffles. My own method is to rise the crossover frequency in about 10 Hz steps from lowest position and compare the imaging of each step to the imaging of the baffles only.

3) Volume:
- The right dose of volume is individual and also depending on the room. In most cases the volume of the woofers is set too high in the beginning.

4) Remarks:
- The phase- and crossover- knobs of the two woofer amps always should be positioned identical.
- The volume may differ a bit because most rooms and speaker placements are not 100% symmetrical, this can follow volume differences in the bass range.
- The quality of records differs a lot and it is impossible to find the right volume for all your records with one volume setting. Choose a position which is fine for you with about 90% of your records and reduce or rise the crossover frequency a bit when you listen to a record which shows a different tonality. Probably you will end with three positions, the middle position is right for most records.

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