Zaph's New Design

[sdclc126]

http://www.zaphaudio.com/ZD5.html

5" Scan Speak Revelator + Vifa Ring Radiator - reads like it would be an incredible build and the crossover section is fascinating - pretty much a cost-no-object/no-holds-barred design for a compact system.

For me it's become not whether to build a Zaph design, but choosing which one!

[wigginjs]

Whoa, I might build this just to hear it. I'm excited.

[PeteMcK]

Zaph strikes again...impressive.

Can anyone explain how to design a ladder delay network?
I was thinking of doing something similar, but have only been able to find an old obscure article about a Tannoy "time delay unit"

(http://www.hilberink.nl/codehans/tannoy34.htm)

cheers,
Pete McK

[Zaph]

Originally posted by PeteMcK
Zaph strikes again...impressive.

Can anyone explain how to design a ladder delay network?
I was thinking of doing something similar, but have only been able to find an old obscure article about a Tannoy "time delay unit"

(http://www.hilberink.nl/codehans/tannoy34.htm)

cheers,
Pete McK

Hello,

Thank you for the comments.

At your link, the one on the bottom looks like a normal 2nd order delay network. What I did was considered a 1st order delay network. If you follow the connections, the layout is similar. There seems to be some interest on how I came up with the values, so maybe I'll update the page with a little info when I get time.

[marsel]

Yes that is a good idea jkrutke and another question a formulas. I have for 90 degrees shift and you got 80 . So how can one change the shift?

[PeteMcK]

Thanks Zaph,
looking forward to it.
Cheers,
Pete McK

[grantnsw]

Hi, I'm wondering if Mr Zaph.. John Krutke is still reading this thread?

If so, thanks very much John for your great Zaph site , I'm a regular 'lurker' there.
(Comments from anyone welcomed too, of course.)

I would love to build the ZD5's but as a retired 'relative newbie', that project is probably beyond my capabilities and budget (drivers~$750AU?), so I heed your warning. (still $750 less x/o, etc for worlds best performance is cheap in my view).

I think I read somewhere on your site that you may consider designing a 'cheaper' 2way 5.5inch system?
...."This system is a bit outside of my normal high value tendencies," (quote from ZD5 page).

Having read your analysis of the various 5.5's tested, the Seas CA15RLY seems good and 1/3? the price of the Revelator. So, I'm wondering if you would consider a 'newbie-friendly' design based on that or similar? Any comments very much appreciated!

Regarding the ZD5 page, (may I quote you again?):
"Still, it's not too expensive, and these drivers live up to their price while most other big dollar drivers are easily outperformed by Asian manufactured drivers at 1/4 the cost." - hmm, any clues here on which you are
referring to?

Also, your L15RLYP/27TFFC design was amazing and an 'eye-opener' for me on how you controlled the horrid 'raw response' breakup of the woofer!

Thank you very much, Grant (Au), and best wishes.

[PeteMcK]

On this page, if you follow the link to
'Time Delay Report by Alex Garner',
There's an old Tannoy paper , somewhat rambling,
about delay networks; available as 17 pdf pages.
Unfortunately the actual schematic (Fig 8) is missing.

http://www.hilberink.nl/speaker.htm

Pete McK

[tktran303]

Hi Grant,

Gee, not yet-another 5.5" 2 way.

There's already the HiVi W5 project-
http://www.zaphaudio.com/audio-speaker19.html

and then there's the Silver Flute project
http://www.zaphaudio.com/audio-speaker13.html

and the SEAS L15 project
http://www.zaphaudio.com/audio-speaker12.html

If you're looking for a project with the SEAS CA15RLY, there's the Dennis Murphy CAOW1

http://murphyblaster.com/content.php?f=CAOW1.html

or with the cheaper SEAS tweeter alternative, Roman Bednarek's Calypso
http://www.rjbaudio.com/Calypso/calypso.html

As you can see, I'm a bit of a DIY loudspeaker trainspotter, but really there are lots of high value 5.5" 2-way designs out there.

As John was alluding to, there are plenty of other drivers out there which have a fanatical or cult following amongst DIYers, but the hard data doesn't it back it up.

But we'll not name names- where there's nothing nice to be said, saying nothing at all.

I made up my own mind after reading the tweeter mishmash, 5.5" and 7" midwoofer roundup tests.

[PeteMcK]

Yeah, I reckon the SEAS CA15RLY looks like it would make a good 2.5 way, using an EBS alignment - Vb 25L, Fb ~42Hz,
or as a 2 way, Vb 15L, Fb ~ 40Hz
Pete McK