If I should alter the cabinet:
Will the project goal "survive" as long as I keep the original baffle width, the active TL-line's length, face- and outlet opening area?
Will the project goal "survive" as long as I keep the original baffle width, the active TL-line's length, face- and outlet opening area?
XRK, keep in mind that phase response is affected by absolute delay, it depends on where you define the reference plane to be. The effect on the graph is dramatically stronger as you go higher in frequency. It's like sitting a half inch or so closer or further from the speaker, totally fair. If you "remove" some overall delay from that measurement (see the Tune menu for the Power Amp in Xsim, or the "delay" control in OmniMic, or similar viewing adjustment in other programs) you can bring the curve down to 0degrees or any other value. Bring it to zero in the highest octave and your rise will become a bump.
Hi Bwaslo,
Thanks for pointing that out - so that means that the new RST28F is probably fine from the standpoint of a 55deg Harsch rise bump. Although very top octave from 15kHz on up seems to be falling and not rising like the RS28F.
I was able to get the predicted phase to unwrap and have the 55deg bump by adding a -1.12in delay to the "Amplifier":
Thanks for pointing that out - so that means that the new RST28F is probably fine from the standpoint of a 55deg Harsch rise bump. Although very top octave from 15kHz on up seems to be falling and not rising like the RS28F.
I was able to get the predicted phase to unwrap and have the 55deg bump by adding a -1.12in delay to the "Amplifier":
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I might have some time to make the Pathfinder for this TL using honeycomb cardboard panels. About 1/2in thick so perfect for this. Will use combination of Titebond glue and tack in place with hotmelt.
First thing to do is cut a long uniform strip of 7in wide parallel boards to use for the internal walls.
Long metal straight edge yardstick and sharp utility knife should do the trick.
First thing to do is cut a long uniform strip of 7in wide parallel boards to use for the internal walls.
Long metal straight edge yardstick and sharp utility knife should do the trick.
Hey, cool! Someone pointed me at your Harsch stuff at a meetup last Nov and I've been wondering since if it could find a passive implementation. Nice to see an example lay it out.
This Harsch passive XO was really a lucky break. Sometimes these things just fall out of the sky. I tried to do this with budget drivers once and the crossover simulation was hairball complicated with 20 crossover components:
Low-Cost PMC-inspired TL Monitor with DC130A and DC28F
Low-Cost PMC-inspired TL Monitor with DC130A and DC28F
@xrk971 any progress in the TL build?
Also planning to build these with WG-300 but dont know what tweeter to choose yet.
Now I just have to convert the plan from inch to mm.
🙂
Also planning to build these with WG-300 but dont know what tweeter to choose yet.
Now I just have to convert the plan from inch to mm.
🙂
@solve: waiting for the Satori BE with wave guide? (no data yet).
Bliesma could also be an option, but decent waveguide have to be confirmed.
Bliesma could also be an option, but decent waveguide have to be confirmed.
Satori TW29BNWG-4 Beryllium Dome Tweeter with Waveguide
Nice! $860/pair. Aluminum waveguide though. How they put stuff up for sale before the measurements are available is strange. It’s all about the polars if they are offering a WG.
Nice! $860/pair. Aluminum waveguide though. How they put stuff up for sale before the measurements are available is strange. It’s all about the polars if they are offering a WG.
From Madisound I can click add to cart and do not get an error. I assume it means that they are in stock?
According to SB acoustics they are not ready for delivery yet.
As of 18 may 2020 they responded to me:
As of 18 may 2020 they responded to me:
Maybe but it has been listed like that from Madisound since end of january....even if they have not started producing it yet.. Maybe they got some early samples?
I know for certain that a couple people over on HTGuide ordered and received units from Madisound, probably 6-ish weeks ago. So, they existed at one point. I wonder whether there was an initial sample run from which Jeff B got some to complete the Helios design and Madisound had the remainder of that run, but there is now a glitch in ramping up production.
Edit: preliminary measurements here: Driver Evaluations for a new project - Page 9
Edit: preliminary measurements here: Driver Evaluations for a new project - Page 9
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