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Mega midbass straight horn 139dB
Mega midbass straight horn 139dB
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Old 7th February 2020, 08:37 PM   #21
freddi is offline freddi  United States
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Mega midbass straight horn 139dB
re: compound horn - - you can tweak this crude attempt to see what might be done

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Old 7th February 2020, 08:43 PM   #22
RobWells is offline RobWells  United Kingdom
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When I built my 80Hz midbass horns I modelled a fully curved sides / straight conical hypex versus 'stepped' curved sides / straight conical hypex and it made no difference at all.

It makes it a lot easier to build.
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Old 7th February 2020, 09:14 PM   #23
pelanj is offline pelanj  Czech Republic
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Mega midbass straight horn 139dB
Just to illustrate the compound horns I played with before I found the super planar. Both are simulated as compound horns (which might not be ideal for the SP, but it seems to get similar results as the official hornresp models). Conical or exponential does not make much difference in these sizes. These were just concepts, the models would require some tuning. Grey is the non-expanding version. The expanding / dual horn seems to be smoother, but ends up as a larger box. It seems to fit my goal so far - 90 % of performance in a smaller box.

If you have space for them, the good old front loaded horns are the best, no doubt about that. I tend to think that a curved side is not really necessary - John Inlow's wonderful 8PE21 midbass horn is stepped and so is the Summer Rain by Joseph Crowe - and their intended range is higher.
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Old 7th February 2020, 11:54 PM   #24
freddi is offline freddi  United States
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Mega midbass straight horn 139dB
here's one a bit better - still might be choked at high levels as only 162 sq.cm. entry into the horn vent

moot anyhow as not practical to build

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Last edited by freddi; 8th February 2020 at 12:22 AM.
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Old 8th February 2020, 04:43 AM   #25
freddi is offline freddi  United States
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Mega midbass straight horn 139dB
hey pelanj - that Liberty 8 looks good in a 0.8 scale "Harkness" blh - do you know if the 2.5mm "overhang" figure is really the coil height being 2.5mm higher than the gap height ? I can't find full spec.
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Old 27th February 2020, 12:16 AM   #26
the Glyph is offline the Glyph  United States
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Back in the day Heil had a mid bass box looking like a double Klipsch LaScala.


With two 101dB/w drivers you get +6dB for two drivers and +6dB for a horn in it's operating range = no need to pad a single mid range driver.


I witnessed the James Gang in the early 70's with these. They didn't have/need subs.
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Old 28th February 2020, 12:48 PM   #27
turk 182 is online now turk 182  Canada
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ah James Gang and Heil likely way cool....


where did find that product literature!? sometimes it's next to impossible to find old pre-net stuff unless someone preserved and uploaded it.
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Old 5th March 2020, 10:36 PM   #28
the Glyph is offline the Glyph  United States
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Sorry turk 182 for the late reply, yes - before the internet.


I hope you still have interest! let me know I can scan all pages and to kipman725 some scans of the 2 Heil pamphlets I have from the 70s.
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Old 6th March 2020, 08:05 AM   #29
turk 182 is online now turk 182  Canada
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yes i'm still interested!
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Old 6th March 2020, 12:55 PM   #30
the Glyph is offline the Glyph  United States
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Quote:
Originally Posted by turk 182 View Post
yes i'm still interested!

I posted all of them in a new thread "Heil Sound pamphlets"
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