Hornresp

[David McBean]

Hi David - is there a straightforwards approach to modeling a 3-chamber bass reflex enclosure with hornresp? (3 external ports, 2 interconnecting ports)

Hi freddi,

Unfortunately it cannot be done. The 3-chamber configurations available in Hornresp apply to band pass systems only:

Attachment 1 - 8th order series
Attachment 2 - 8th order parallel
Attachment 3 - Type B
Attachment 4 - Type C

Kind regards,

David

 

[David McBean]

I'm not sure why the program crashed at that point. Seemed to work perfectly fine afterwards.

Thanks for the feedback. Hopefully Hornresp won't crash again any time soon .

What I'm trying to figure out is if placing a restriction in the line before the driver could be used to filter out a particular resonance frequency. I thought "OD2" puts the driver at S4, but that doesn't seem to be the case.

I gathered that you wanted to place the driver at S4 but that option is not available and would require a lot of work to fully implement. Probably the closest that you can get is to use the OD1 option with a constriction at S2 as shown below. Not sure how well it would work though.

 

[David McBean]

Probably the closest that you can get is to use the OD1 option with a constriction at S2 as shown below.

Possible alternative designs using stepped segments.

 

[Brian Steele]

Hmm... it might be difficult to convert those alternatives to an actual build....

This shows the potential advantage of introducing a restriction - it might be possible to use it to address one or more of the harmonic resonances. In this case a restriction impacted the resonance at 3*Fb without impacting the low frequency performance. However, I can already address that by repositioning the driver's location in the path. If I can position the restriction before the driver, maybe I'll be able to reduce the impact of the harmonic resonance at 5*Fb.

 

[David McBean]

I thought "OD2" puts the driver at S4, but that doesn't seem to be the case.

If all goes according to plan hopefully it will be, after the next update. There will be a price to pay though - to reduce the amount of coding the User will be required to manually change OD2 to OD3 on any existing Ripole records, rather than it being done automatically as part of the update.

The offset driver configuration options will become:

OD - Driver at S2
OD1 - Driver at S3
OD2 - Driver at S4
OD3 - Ripole loudspeaker

Although it complicates things somewhat I prefer the above to simply leaving the Ripole as OD2 and adding OD3 for the S4 offset.

 

[Brian Steele]

FWIW, I thought it was a bit confusing that Ripoles would be considered as part of the offset-driver series of models, rather than part of the Compound Horn series...

 

[Gubbe]

I'm having trouble with "capture results" in version 55.20.
It just doesn't show up most of the time. Is this a known issue or am I doing something wrong?

 

[David McBean]

FWIW, I thought it was a bit confusing that Ripoles would be considered as part of the offset-driver series of models, rather than part of the Compound Horn series...

Because the Ripole is normally considered to be a folded open baffle loudspeaker, I felt it best to group it with the other open baffle systems as shown in the Attachment, rather than associating it with compound horns.

 

[David McBean]

I'm having trouble with "capture results" in version 55.20.
It just doesn't show up most of the time.

If using the Loudspeaker Wizard, only the Power or Pressure response chart results can be captured.

 

[Gubbe]

If using the Loudspeaker Wizard, only the Power or Pressure response chart results can be captured.

If I am on the main screen "Input Parameters" I press calculate, the view then changes to "Acoustical Power" I right click and press "Capture current result" I then chose "Input Parameters" again, I click "Previous" and then "calculate" to run the previous record and on "Acoustical Power" I press "Release Captured result" but nothing happens?

 

[Gubbe]

If using the Loudspeaker Wizard, only the Power or Pressure response chart results can be captured.

Also "Compare previous F4" under tools is always grayed out?

 

[BoxBoxBox]

Hi,

After using the OD wizard and designing a simple horn I began to wonder.. how can the position of a matching second driver be added? For clarity, like the image below.. See post #14,075 for the single driver record.

edit
Just noticing from looking a few posts back that this update is what you are currently working on. So for now, we are at a pause?

Thanks!

 

[David McBean]

I press "Release Captured result" but nothing happens?

Pressing 'Release captured results' releases the captured results so that that there are no longer any captured results to compare the current results against.

Also "Compare previous F4" under tools is always grayed out?

F4 is disabled because the captured results have been released and there is nothing to compare the current results against.

To capture current results:
Either right-click the mouse and select 'Capture current results' or press the Ctlr+C keys.

To compare current and captured results:
Either select the 'Tools' > 'Compare Captured' menu commands or press the F4 key.

To cease comparing current and captured results and revert to the default setting of comparing current and previous results:
Either right-click the mouse and select 'Release captured results' or press the Ctrl+R keys.

 

[David McBean]

how can the position of a matching second driver be added?

Multiple drivers are modelled as a single equivalent composite driver. For the purposes of the simulation the drivers are considered to be a point source. If for example the design calls for two drivers connected in parallel, physically located reasonably close together, then specify OD = 2P. The diameter of the driver in the schematic diagram will be larger to reflect the fact that the area of the composite diaphragm is now 2 x Sd, as shown in the attachments.

Just noticing from looking a few posts back that this update is what you are currently working on.

Not quite .

After the update it will be possible to specify a single driver or multiple drivers at S2 or S3 or S4, but not at S2 and S3 and S4.

 

[David McBean]

There will be a price to pay though - to reduce the amount of coding the User will be required to manually change OD2 to OD3 on any existing Ripole records, rather than it being done automatically as part of the update.

On further investigation it turns out that it will be possible for existing Ripole records in the Hornresp.dat data file to be changed from OD2 to OD3 automatically.

The only time that the User will now be required to manually change OD2 to OD3 is when a Ripole record exported from an older version of Hornresp is imported into the proposed new version.

 

[David McBean]

FWIW, I thought it was a bit confusing that Ripoles would be considered as part of the offset-driver series of models, rather than part of the Compound Horn series...

If you prefer to think of a Ripole loudspeaker as a compound horn rather than as an offset driver system, then you can certainly do so. The attached CH3 compound horn with 50.3 cm path length produces identical results to the attached OD3 Ripole system .

 

[Gubbe]

I press "Release Captured result" but nothing happens?

Pressing 'Release captured results' releases the captured results so that that there are no longer any captured results to compare the current results against.



F4 is disabled because the captured results have been released and there is nothing to compare the current results against.

To capture current results:
Either right-click the mouse and select 'Capture current results' or press the Ctlr+C keys.

To compare current and captured results:
Either select the 'Tools' > 'Compare Captured' menu commands or press the F4 key.

To cease comparing current and captured results and revert to the default setting of comparing current and previous results:
Either right-click the mouse and select 'Release captured results' or press the Ctrl+R keys.

Ah! Thanks a lot for your great support!
And on New Year's eve nonetheless!

 

[teodorom]

705 pages!?! Sorry if I ask a question already asked.
As far I know and understand in HornResp the Acoustical Power is in PWL terms. How can I correlate those measures with their SPL counterpart?
The formulas that I have found so far don't describe a behaviour that differs (PWL: lowering, SPL: constant) when moving up with the frequency.
Thanks and Happy New Year!

 

[LORDSANSUI]

Happy New year DIY folks, peace, health and many new successful projects for you.

Best Regards,

Marcelo

 

[BP1Fanatic]

You too guy!