What tools to use to model/design dipole H frame woofer section for OB speaker?

[DaveFred]

Hello,

I am looking to build a three way open baffle speaker with the dual woofer portion being in an "H" frame.

Any good tools to help design this?

Thank you,

David.

 

[xrk971]

Not the same but very similar. The techniques for design of a multi-way OB are all in SL’s superb website. I’m glad they kept this going.

LX521 Description

Tools?

A microphone like UM-1
REW software for measurement
Xsim software for simulation & design of XO
Akabak software for modeling acoustics response

As speakers go, multi-way OB is perhaps one of the most complicated and probably not an ideal project for a novice. There are a lot of tools you need to get a better feel of first.

 

[scottjoplin]

The most important thing is to cross over below the cavity resonance OB Theory

 

[warrjon]

Scott is spot on. I have 2x12" woofers in a W frame.

First pic is the woofer only with no XO, the resonant peak is at 300Hz. Second pic is with the XO set at 225Hz 24db/oct to a MarkAudio Alpair 12P.

Both measurements are taken at 1m from the centre of the 12P on axis

My speakers are biamped with a DSP to set XO then I build an active line level XO.

I have a UM-1 calibrated microphone, and it has taken a few years of tweaking to get these speakers sounding AMAZING.

 

[warrjon]

Just another thought came to me.

You want to design the speakers so the XO is out of the telephone band 300-3600Hz IME this provides the best clarity and imaging.

 

[David McBean]

Any good tools to help design this?

Hornresp can now simulate H-frame loudspeakers.

 

[DaveFred]

Hornresp can now simulate H-frame loudspeakers.

Is there a dummies guide on how to set up for H Frame?

 

[David McBean]

Is there a dummies guide on how to set up for H Frame?

Hi David,

Not that I am aware of.

You can however use the Input Wizard accessed from under the Help menu to specify the generic H-frame example, and then open the Loudspeaker Wizard and adjust parameter values to suit.

Kind regards,

David

 

[oneoldude]

Horn Response on Windows 10

I can not get Horn Response to run on Windows 10. It tells me it cannot find MS Sans Serif .

Suggestions?

 

[ernperkins]

David -

You could try looking at "ABC Dipole"

It was developed with an older version of Excel and requires the same Excel Toolpaks as Bagby's PCD. The Excel file seems to open fine on my Excel 2010. The included help file has all the Excel setup information info. I haven't actually used it for design, but it was recommended by PWRRYD (over at the MAC and PETT forums) who has used it.

 

[oneoldude]

Thanks, but I already have ABC Dipole. I actually bought it when it was not free. Shows you how old I am.

But I cannot get HornResp to work. It is apparently a very good program with a long pedigree. Accurate too. Anyone know how to get it running on 10. I really do not want to reserve a computer to run 7 or XP. Finding an old copy of XP or 7r will be a real chore.