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Multi-Way Conventional loudspeakers with crossovers

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Old 5th May 2012, 08:36 PM   #61
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motosapien,

Yes 470uH --> 0.47mH (u=micro)

The DX25 is a very common tweeter :
Madisound Speaker Store
Vifa DX25TG09-04 1" Fabric Dome Tweeter 264-1020
The scan-speak is not necessary to sell when you sell the vifa version which is the same.
But if you want to use the SB tweeter, you can It is very similar to the DX25. This new version of the DX25 TG09 is better than the old version TG05.

The spring is starting and the weather is good. I don't have enough time to enjoy the sun. We should change President tomorrow...
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Old 5th May 2012, 09:04 PM   #62
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Quote:
Originally Posted by jerome69 View Post
We should change President tomorrow...
Good luck with that ( we tried it recently and not much "changed" )

But alas, I've strayed into forbidden territory......

Merci for the reply! I'm ready to hit the order buttons and wait for the joyful arrival of the brown UPS trucks. I should say that the Manzanitas are really amazing speakers, engaging and fun to listen to. I just want to kick things up a notch or two. Simple & inexpensive is a good way to start into OB's though and John & Pano have stirred things up with their fine design.

I'm going to stand mount your low cost design like I have the manzi's. I'm plenty happy with their bass response so I don't need the floor coupling the full length baffle would provide. I'll let you know how they turn out Jerome.

Many thanks!!!
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Old 6th May 2012, 01:00 PM   #63
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Default Vifa phase optimisation

Mount the SLS315 on a 1m tall baffle improves a little the bass response.

Having a little more time to think. It could be a next step of optimisation of the speaker with the vifa mid. The vifa is a smaller driver than the SDS and has a better response in the treble.
I don't know if the result will be very audible. For those who want to listen (a tweak for less than 10$)
The idea is to transform second order to third order low pass crossover on the vifa mid.
See schema below. The spl response is not changed at all, but the phase is different. The treble should have better transient and attack.

That's all.
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File Type: jpg vifa_3_5_opt.jpg (35.5 KB, 540 views)
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Old 10th May 2012, 12:32 AM   #64
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Jerome,
Ive been a bit distracted with some travel and work. Thank you for posting the speaker links, very interesting to see driver uses and pricing.

I don't know enough about drivers and design but certainly respect your opinion on the TT-130.

Hoping you won't mind taking a look at the attached cross over list (post #55). Im still learning and hoping to order the correct components.

I also have a couple additional questions .

Post # 53 - due to the Hiquphon tweeter I should use; R-5=3.3 ohms and R6=3.9 ohms (+2/-1ohms,to be tuned)is this still correct?

Post #63 - is L32 and C32 added into the circuitry or do they replace L3 and C3?

Thank you again for all your generous help! This is a lot of fun and Im looking forward to the next steps.
Marko
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File Type: pdf Network list.pdf (44.5 KB, 32 views)
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Old 10th May 2012, 05:42 AM   #65
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Hi Marko,

You list has a wrong value

(2) Woofers Peerless 830669
L1 10mH P‐core 15G 0.33 Jantzen
Lz1 1mH Perf. lay 14G 0.21 Erse (Could be very cheap, 1ohms resistance)
Cz1 6.8uF 250v Dayton
Lz2 20mH Iron core 16G N/A Erse

Cz2 1000uF 100v
Not easy to find in the US and expensive... (In Europe cost 2 times less expensive)
Use 2x2200uF and mount then head-to-tail instead

Rz2 10ohms 20w Parts Exp

(1) Midrange Vifa 18‐08
C2 15.0uf 250v Dayton
L3 1mH Perf. lay 14G 0.21 Erse
C3 6.8uf 250v Dayton
R2 2.2ohm 10w Xicon
R3 15ohm 10w Xicon
L32 .33mH Perf. lay 14G 0.1 Erse
C32 2.2uf 250v Dayton

(1) Tweeter Hiquphon OW 1
C4 4.7uf 250v Dayton
L4 .22mH Air Core 18G 0.21 Jentzen
C5 15.0uf 250v Dayton
Cz3 1.0uF 250v Dayton
Rz3 6.8ohm 1w Part Exp.
R5 1.01 10w Dayton
R6 10ohms 10W/20wParts Exp

Post #53 These values are for one woofer. You should not use them.
Post #63 It is an addition, they don't replace L3 and C3, they only improves phase tracking.

I think the list is ok
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Old 10th May 2012, 01:41 PM   #66
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Thank you Jerome! Will be placing the order soon. As the man from the big lake says; (Motosapien)....will be joyfully awaiting the big brown truck.
Kindest,
Marko
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Old 13th June 2012, 09:00 PM   #67
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Hi Jerome,
It's been awhile, hope all is well.

Happy to report...your speakers are now up and running. I had some frustrating delays with receiving broken P-core's. All straightened out now and starting to settle into the big easy.

First impression...very very positive!!!!

While the Manzi's are amazing, considering the simplicity and cost, these present considerably more -sound...presence, depth and impact. Big upside.

Looking forward to some extended listening sessions, likely some tweaking ahead...may have additional questions along the way.

Thank you again for your continued help and support!
Kindest,
Marko
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Old 14th June 2012, 10:08 AM   #68
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Hi Marko,

I am fine Not have a lot of time to do HiFi or listen to music

Happy to read your first impressions. Two woofers work better than one
You shouldn't go back.

Waiting for some pictures of the speaker
I think you have to do extensive listening. I worked more than two years on this speaker to have the best from it.
You should rediscover your discs

Have Fun !
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Old 14th June 2012, 01:55 PM   #69
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Jerome,
Sounds like you've been distracted with "other stuff"...sounds familiar.

Best to hold off with the pictures right now since I'm still working with the prototypes. Actually, they're now full of tape, cardboard etc...as I've begun experimenting. It will be some time before starting in on the finished set.

Planning to check in from time to time, when I do please don't be shy in letting me know if you're challenge for time.

Having some fun!
Marko
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Old 8th July 2012, 09:50 PM   #70
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Hi Jerome,
I’m happy to report; substitute drivers and all, your speakers (prototypes) have been a blast. Absolutely love em’. Your comment; “You should not regret”… was…is …right on the money!
When I first began working with the Manzi’s, then moved to your design, I always had in the back of my mind “finish them, sell them, move onto the Orion’s” What I can now say for certain… moving on or selling these won’t happen anytime soon. They will be enjoyed for several years to come and I’ll be hard pressed to sell them…. ever.
It’s now time to begin work on the finished pair. Should you have time, answers to the following questions would be very helpful.
I plan to go with the DX 25 tweeters and the HDS134GF (830991) mids. Is your post #35 the correct crossover network? Do the adjustments in post #38 apply? (#38 shows the SDS134 mid vs. the HDS134).
Any other crossover comments or tweaks?
Here are few construction questions;
- I have an extra slab of Travertine marble which I may attempt building the baffles out of. Outside of being rather heavy, any concerns with this material vs. wood?
- I’m also considering a slight rounding or curving of the side edges (vs. squared), maybe top edge too… okay?…should the baffle size be adjusted if I do this?
- I’ve seen other baffle designs that add felt to the front and damping material or spray to the rear, any strong opinion?
Thank you for your continued help with this, our listening enjoyment has been very much enriched through your good work.
Kindest,
Marko
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