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Multi-Way Conventional loudspeakers with crossovers

Small La Scala Tutorial for noob
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Old 15th March 2019, 08:58 AM   #71
David McBean is offline David McBean  Australia
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Originally Posted by sumotan View Post
so many programs including Hornsrep canít be downloaded to windows 10 software.
Hornresp works with Windows 10.
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Old 15th March 2019, 09:29 AM   #72
sumotan is offline sumotan  Indonesia
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Sorry I never said that Hornspresp cant work with W10, Im block from downloading Hornsresp & some other programs as well. Can’t explain why but it’s happening on my laptop.

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Old 15th March 2019, 05:02 PM   #73
freddi is offline freddi  United States
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Small La Scala Tutorial for noob
@sumotan - Unfortunately, SIZE can matter with loudspeaker cabinets and especially when downsizing from something functional. When going down in size, LF cutoff is pushed upwards as are effects in the response and one can end up with a cute looking cabinet with no real merit and perhaps with more effort than something larger and usable.

Look at the "stubby horn vent" ~28 liter system below vs a simple liter reflex and then a 28 liter simple vent reflex. The system the 28 liter stubby vent example was derived from was a design by "RCA-Fan" (Bill Woods is a big fan of RCA's Harry F. Olson). At full size that vent puts a little bit of "hit" into the response - nothing like JBL's Harkness which had a small chamber and sizable back horn).

The little stubby horn vent system (one name for them back in the 1950's/60s) moves that rise in response from the "hit" region up to where its really not good (imo).

The huge Vitavox Thunderbolt looks pretty good at 0.7 scale as starts out big and has a usable 1/4 wave path after scaling.

So you might pick up on a pretty big cabinet to scale downwards - or make a new design.

I showed some of the previous sims of real small cabinets in the corner - to smooth them somewhat and try to get down to around 100Hz.

Click the image to open in full size.

Last edited by freddi; 15th March 2019 at 05:06 PM.
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Old 15th March 2019, 05:32 PM   #74
sumotan is offline sumotan  Indonesia
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Hi Freddi, thanks again for your advice. What you say really makes sense.
Was googling for the Vitavox Thunderbolt plans but unfortunately no exact
details.

Thank you again for all your time & advice
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Old 15th March 2019, 06:22 PM   #75
freddi is offline freddi  United States
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I was told by a horn expert that that one side view sketch of a Vitavox Thunderbolt is proper and to dimension it vs the woofer's frame diameter in the drawing.

Here's the woofer's PDF showing a 15" dimension

http://www.vitavoxhifi.co.uk/pdf/151_engineering_2.pdf
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Old 15th March 2019, 07:12 PM   #76
GM is offline GM  United States
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Quote:
Originally Posted by sumotan View Post
Sorry I never said that Hornspresp cant work with W10, Im block from downloading Hornsresp & some other programs as well. Canít explain why but itís happening on my laptop.

Cheers
Oops! Another late, late over night 'senior moment'.

Hmm, I've had this every time [install and update] since I 'downgraded' from 2k Pro to 7 pro 64, telling me it looks like something from a 'nasty' site, but allows me to override it and DL anyway.

GM
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Old 15th March 2019, 07:22 PM   #77
freddi is offline freddi  United States
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I've had "Paint" crash a few times today - very annoying to have to give permission to open a picture file- what's good about Win10 seems to be mitigated with their stupid "updates"
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Old 15th March 2019, 07:33 PM   #78
GM is offline GM  United States
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Do you have it setup to only DL/install security updates?

GM
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Old 15th March 2019, 08:01 PM   #79
freddi is offline freddi  United States
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I've not setup Win10 yet on my new/old PC
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Old 16th March 2019, 12:58 AM   #80
freddi is offline freddi  United States
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btw sumotan - if you cut William Cowan's 2-19 sub in half down the middle for one driver, the response looks reasonably good ( at little peaky on the bottom) - it would like more back chamber volume - so you could increase the cabinet height to get more back volume without increasing build complexity. GM - do you think William's assumption of the corner effect to still apply out to 1M? that would smooth things - I think.

Click the image to open in full size.

Last edited by freddi; 16th March 2019 at 01:07 AM.
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