Waveguides and horns

[Tytte71]

Count me in for the SEOS18 1,4" for Radian 951

 

[jzagaja]

Ok. I'm sending CAD file tomorrow.

 

[jzagaja]

A couple of new pictures.

 

[jzagaja]

Amplifier.

 

[jzagaja]

SEOS-18 eDrawing file. It accepts 1.4 and 1.5 drivers, roundover set at 15 inches for mating with 15" woofers.

 

[NiToNi]

Yaaaay

Is that with a zero degree throat angle?

 

[jzagaja]

No with 7deg (14deg full) Should I set to 0 deg? Then it is difficult adopt both 1.4 and 1.5 inchers )

 

[jzagaja]

90deg waveguides expand very quickly and so length is really short - 8.5 inches and you want cross low I suppose. Length should be above 12".

 

[AndrewT]

Does it have to be a 90deg for a waveguide?
What about 80deg or 70deg?
How do the parameters change if a different angle is chosen?

 

[jzagaja]

Simulation (acoustic power) between 90deg (20cm long) and 60deg (32cm long).

 

[Tytte71]

I'm selfish and want SEOS18 1.4" with 0deg Also have 1.5" driver that is optimized for 0deg throat.

 

[jzagaja]

Radian 951? I'll check angles at 1.5".

 

[Tytte71]

Yupp, Be edition At the moment it is playing in a mock-up with E-OS15... Really nice WG and driver - I can recommend this combo!

 

[jzagaja]

Measuring with BK2012 is very fast - faster than ARTA. Just two buttons when delay is set. When done save as ASCII (by using autosequence). Polars are stored in 36 curves as Z-Axis. Excel 2007 must be used because older does not accept more than 256 columns

Below is resulting data for those who willing to try make a crossover: Mummy equipped with BC DE500 and 12B100R. Angles: 0,5,10,15,20,30,40,50,60,80,100,120,150,180.

 

[jzagaja]

Spreadsheet for sound power calculation of above data.

 

[NiToNi]

No with 7deg (14deg full) Should I set to 0 deg? Then it is difficult adopt both 1.4 and 1.5 inchers )

Yes, I am almost certain that the throat angle is almost zero degrees on the 951Pb but it would be great if someone could confirm the exact number. I think also the inner diameter is marginally greater that the outer.

This is great! So when can we order?

 

[Tytte71]

Yes, I am almost certain that the throat angle is almost zero degrees on the 951Pb but it would be great if someone could confirm the exact number. I think also the inner diameter is marginally greater that the outer.

This is great! So when can we order?

I don't have it confirmed by Radian or having a sectional drawing of the driver, but I tried to measure it without dismantling the bug screen. According to Guido Behringer the phase plug exit is Ø1.5". I measured 17mm from the exit to the phase plug. This implies a negative half angle of some 4deg.

 

[jzagaja]

Negative angle is worst thing because demoulding requires positive angle.

 

[Tytte71]

Negative angle is worst thing because demoulding requires positive angle.

Please don't blame me 0deg should be close enough?

 

[jzagaja]

Of course - we will make as close as 0deg as possible