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Multi-Way Conventional loudspeakers with crossovers

Simple Passive Harsch XO Using PTT6.5 and RS28F in a Waveguide
Simple Passive Harsch XO Using PTT6.5 and RS28F in a Waveguide
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Old 30th June 2020, 09:59 PM   #211
billshurv is online now billshurv  United Kingdom
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Simple Passive Harsch XO Using PTT6.5 and RS28F in a Waveguide
Quote:
Originally Posted by xrk971 View Post
I examined the internal structure closely and discovered a few leaks on the divider panels that were not perfectly sealed for air tightness and may have been contributing to a TL pinhole leak. This would compromise the bass extension and sensitivity of the bass.

That has possibly saved me from a 'hold my beer' moment. I was trying to work out if I could convert a cabinet I have to TL by inserting the labyrinth from the rear. Additional risk assessment required!
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Old 30th June 2020, 10:26 PM   #212
xrk971 is offline xrk971  United States
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Simple Passive Harsch XO Using PTT6.5 and RS28F in a Waveguide
If you can sure they are sealed - use PL Premium expanding industrial adhesive. But it is risky unless the fit is very snug.
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Old 30th June 2020, 10:37 PM   #213
mainframe99 is offline mainframe99  New Zealand
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I'm about 95% on board with a floorstanding TL for this purifi woofer for my next cabinet project, maybe with an older soft dome tweeter of which I have many here. I keep chasing more bass clarity with this woofer. Its gone from really good in the reflex cab to very good in the passive radiator cab to ?? in the TL cab. I don't have the skill to do the TL design so hopefully someone finalizes a design which I will build. I couldn't figure out that TL software.
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Old 30th June 2020, 10:41 PM   #214
billshurv is online now billshurv  United Kingdom
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Simple Passive Harsch XO Using PTT6.5 and RS28F in a Waveguide
My skills are not up to that. Ah well, onto plan D
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Old 30th June 2020, 10:48 PM   #215
mainframe99 is offline mainframe99  New Zealand
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Quote:
Originally Posted by Ugg10 View Post
If the line is approx 89 as I calculated it then this would give a quarter wave tuning of 30hz (MH-Audio calculator) which matches my Leonard and XRKs models reasonably well.

Whilst I am on, @mainframe99, I saw you did a minidsp crossover for the purify 6.5 (is this the 4 ohm version) with a 26adc using the Harsch scheme that looked very good, any chance you would be willing to share the settings via PM if I send you a message (personal use only).

(Sorry emails crossed in the ether).

Flick me a PM - sorry I am very busy at work at the moment but when things calm down ill be back at it
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Old 1st July 2020, 03:02 PM   #216
xrk971 is offline xrk971  United States
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Simple Passive Harsch XO Using PTT6.5 and RS28F in a Waveguide
If there is a lot of interest in a floorstander TL, I’ll see if I can design some plans.
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Old 1st July 2020, 04:21 PM   #217
Paul Ebert is offline Paul Ebert  United States
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I would be VERY interested!
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Old 1st July 2020, 07:51 PM   #218
puppet is offline puppet  United States
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Quote:
Originally Posted by billshurv View Post
That has possibly saved me from a 'hold my beer' moment. I was trying to work out if I could convert a cabinet I have to TL by inserting the labyrinth from the rear. Additional risk assessment required!
You'd loose 1/2" of cabinet interior width in exchange for building the labyrinth with 1/4" sides. All sealed up nice and slip the assembly into the shell you've got.
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Old 3rd July 2020, 02:12 PM   #219
deerhunt is offline deerhunt  Sweden
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I did some impedance measurments of the Purifi in TL-box.
Comments are welcome

Click the image to open in full size.

Very low tuning frequency around 26Hz
The "cats ears" are quite different in height. Not sure if I should fill more to make them more even? The 2 curves are with 50 (2oz) and 80g (3oz) fill (wool).

Should I try to get rid of the knee at 100Hz?

There is a small resonance at 270Hz (1,25m). Can it be a standing wave from top-bottom-top of the first section? My internal measure is 82cm but with influence of the damping?
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Old 3rd July 2020, 02:50 PM   #220
deerhunt is offline deerhunt  Sweden
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Since I'm on it - here's the nearfield measurments also

Click the image to open in full size.

There is a peak at 3700Hz. I can hear it when playing music! I'm currently using 1,5kHz 12dB LR and that sounds good. The Bliesma T34A is able to do that crossover point as well.

It's about 9cm from baffle to first internal section. It might not be enough?
Considering the low tuning (26Hz), what do you think about cutting the first internal section half way - giving a shorter TL-length, but would allow the Purifi to breathe better?
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