1st time try- TQWT -Beta 10CX

[1hiep0]

Hello,
I sim using Brian's sheet, could not flatten the upper range. What did I do wrong? It's 2 ways passive coax for home karaoke. Thanks,

 

[planet10]

Not enuff stuffing?

dave

 

[GM]

The HR sim has the vent exiting out the bottom, but the reality is that odds are the vent output will be near enough the same acoustic length to the listening position [LP] as the driver, so go into the 'chamber' window and add [92.2+2.6+37.9]/2 = 66.35 cm in the 'path' field to sum the two at the LP.

GM

 

[freddi]

looks great with GM's suggested path. What crossover and compression driver are you going to use? I tried Eminence's values with Beta10cx in a Karlsonator and felt those with ASD1001 were very dull in the mids for home use. It had good cone control and usable output to tuning (37Hz)

 

[chris661]

The HR sim has the vent exiting out the bottom, but the reality is that odds are the vent output will be near enough the same acoustic length to the listening position [LP] as the driver, so go into the 'chamber' window and add [92.2+2.6+37.9]/2 = 66.35 cm in the 'path' field to sum the two at the LP.

GM

I thought the "Path Length" was the difference in distance between driver and port to the listener.

Chris

 

[phivates]

Do you have stuffing above the driver? And can you hear/measure the ripple? The box wants to make a standing wave if undamped. At 8' it could be built the other (tapered, no ML vent) way. Alls ya gotta do is pivot the internal baffle forward so the skinny end connects to the vent. Like I have drawn a thousand times but not built yet. Tuning would be too low probably.

 

[1hiep0]

The HR sim has the vent exiting out the bottom, but the reality is that odds are the vent output will be near enough the same acoustic length to the listening position [LP] as the driver, so go into the 'chamber' window and add [92.2+2.6+37.9]/2 = 66.35 cm in the 'path' field to sum the two at the LP.
GM

Thank GM I am lost at this would you explain?

 

[1hiep0]

looks great with GM's suggested path. What crossover and compression driver are you going to use?

I will be using PSD2013 cross at 1.5kHz.

 

[freddi]

psd2013 should be very nice - I'd like to see he network some time but don't have that driver.

 

[GM]

I thought the "Path Length" was the difference in distance between driver and port to the listener.

Chris

It is, but consider the size of the WLs relative to the LP. Anyway, MJK's first few? generations of various [ML]TL MathCad WS summed at the driver, i.e. ignored where the vent was and measured responses were so close to simmed that only when the vent was on the rear did it make any potentially audible difference.

GM

 

[GM]

Thank GM I am lost at this would you explain?

Hmm, not sure how to make it simpler; I mean once the basic inputs are done the rest of the design, fine tuning, etc., is all done/saved in the Wizard.

GM

 

[freddi]

with hornresp - first do a calculation. Select Acoustical Power -then under "Tools" find "Output" and click on "Combined" - that opens up a utility where one enters the distance between cone center and ~vent center. THEN - go back to the Input screen to select the Loudspeaker Wizard to check effects .

 

[GM]

??? Why bother when you can do it the LW while watching it in real time?

GM

 

[1hiep0]

psd2013 should be very nice - I'd like to see he network some time but don't have that driver.

Thank freddi, I certainly will post the X-over as progress.
That look better, would you mind posting the hornresp input screen?
The idea is to have the coax center at the ear height as possible.
I started out the sim using Brian's sheet as stated in the original post and import to hornresp….still learning!.

 

[freddi]

GM - its obvious I'm not adept at HR. How does one quickly manipulate the "Acoustic Path Between Outputs" feature within LW?

1hiep0 - - here's the input I used - not sure of the path between the driver and vent centers

 

[David McBean]

What did I do wrong?

For one thing, the Cms value of 3.70E-01 m/N is not correct .

Cms = 0.37 mm/N = 3.70E-04 m/N

 

[David McBean]

I thought the "Path Length" was the difference in distance between driver and port to the listener.

In Hornresp, the acoustic path length is the length of the shortest acoustic path between the two outputs (assumed to be point sources). In the design being considered it is the distance between the centre of the direct radiator and the centre of the horn mouth.

Path length = 92.2 + 2.6 + 37.9 = 132.7 cm

 

[David McBean]

How does one quickly manipulate the "Acoustic Path Between Outputs" feature within LW?

 

[1hiep0]

...so go into the 'chamber' window and add [92.2+2.6+37.9]/2 = 66.35 cm in the 'path' field to sum the two at the LP.

GM

Which path length is it L12, L23..? I don't understand.

 

[1hiep0]

fixed

For one thing, the Cms value of 3.70E-01 m/N is not correct .

Cms = 0.37 mm/N = 3.70E-04 m/N

Fix, thank Dave