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Multi-Way Conventional loudspeakers with crossovers

silk purse from sows ear contest?
silk purse from sows ear contest?
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Old 17th June 2018, 09:32 PM   #11
Jared is offline Jared
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Well I know $20 per speaker can be done easily. The Dayton B652 uses known cheap drivers and a single cap on the tweeter for a crossover.

Poly buyout woofer $5.88
GRS 1tm-4 $2.90

$9 in drivers leaves $11 in creative improvements over the B652.

Full disclosure, this is exactly the system I had in mind to improve apon, mostly trying to figure out a way to low pass the woofer, and use a silk dome tweeter such as:
peerless BC25SC06 $10 only leaves $4
or
dayton ND25FA $13 only leaves $1

I would be incredibly impressed (but not too surprised from the minds on this forum) if someone did come up with something "excellent", and I suspect the feedback and collaborative suggestions will help us all. I look forward to doing my first measurements of a speaker, showing some pics, and learning how to do better.

Last edited by Jared; 17th June 2018 at 09:36 PM.
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Old 17th June 2018, 09:40 PM   #12
Jared is offline Jared
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Quote:
Originally Posted by bbutterfield View Post
That's a good point that the measurement conditions would probably have to be standardized. Also, the set of measurements would have to be standardized as well. For example, should this include off-axis measurements, or on-axis only? If off-axis is included, do you do both vertical and horizontal?
Excellent points. Initially I had only thought for on axis. I think it would be interesting for the rules to allow some creative gamification and "cheating" though. For example, if the purpose is to optimize a 1W/1M sweep, who cares if it hits Xmax at 2w ? Or if it is only for on axis, who cares if it is intollerable 30deg off. As long as the 'cheat' is explained so the rest of us can 'appreciate' it!
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Old 17th June 2018, 10:26 PM   #13
tsmith1315 is offline tsmith1315  United States
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Sounds neat. Perhaps an ongoing contest, quarterly or even more frequent? $20 limit this time, $50 limit next time, a $30 TL, a scavenged parts only contest, etc.
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Old 17th June 2018, 10:43 PM   #14
phivates is offline phivates  United States
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Audax 10mm tweeter is $2.50 at Madisound - just like 30 years ago
So two of the 5.88 woofers in series and the audax with a cheap mylar cap and a recycled box...music!

Last edited by phivates; 17th June 2018 at 10:58 PM.
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Old 18th June 2018, 01:55 AM   #15
Pano is offline Pano  United States
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silk purse from sows ear contest?
The guys in Seattle run a very good speaker contest, it would be nice to get them to weigh in. Theirs is a blind listening contest, but I'm sure they'd have some pointers.
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Old 18th June 2018, 04:31 AM   #16
PeteMcK is offline PeteMcK
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" $20 per speaker can be done easily" - maybe in the US, but elsewhere, I doubt it, unless you're a total scavenger like me....
e,g the above mention Dayton tweeter is $24 here...
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Old 18th June 2018, 05:57 AM   #17
KaffiMann is offline KaffiMann  Norway
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It's most likely impossible to purchase anything at all here (maybe except binding posts and glue?), and keep under 20$ limit.

Good idea, but I wish the limit was a little bit higher, at the moment it seems that these restrictions make the competition only for residents of the US.

I would be more in favor of a "scavenge only" contest.

Edit:
Did not see the "DO NOT include shipping cost", but this is still pretty vital. It could be as much as 50$ or even more in shipping alone to get 20$ worth of whatever few drivers are needed. The amps and such is not much of a concern really.

Last edited by KaffiMann; 18th June 2018 at 06:22 AM.
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Old 18th June 2018, 09:07 AM   #18
Jerms is offline Jerms  United Kingdom
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Needs to be $45 to $60 per speaker. Suggest using USA websites prices for drivers even if purchased elsewhere to price-match against native USA builders.


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Old 18th June 2018, 09:35 AM   #19
system7 is offline system7  United Kingdom
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The cheapie Dayton B652 is interesting. Dayton Audio B652 6-1/2" 2-Way Bookshelf Speaker Pair

A well behaved 6" polycone and an 8" paper cone can get to much the same place, as the Vifa PL17WJ-00-08 FR below shows. A question of mechanical cone damping. It always needed a bass coil at least though.

I scavenged these 8" Sony E44 with a similar cheapie balanced-drive coneish mylar tweeter for 20. Simple 3.3uF capacitor to tweeter. Nothing else.

Click the image to open in full size.

They sounded like dreck, TBH. I did a better crossover and they were then remarkably good.

These days I am working on a WLM La Scala clone, which went for 2,500 Euros originally, with a 4th order tweeter filter and available drivers in the same cabinet. Surprisingly, I am finding the modern Visaton bass isn't actually so musical or enjoyable as the original Sony retro bass cheapie.

Click the image to open in full size.

But I cannot do this for $20.
Attached Images
File Type: png Vifa PL17WJ-00-08 6 inch Polycone.PNG (23.9 KB, 301 views)
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Last edited by system7; 18th June 2018 at 09:47 AM.
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Old 18th June 2018, 12:07 PM   #20
KaffiMann is offline KaffiMann  Norway
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... You could *almost* pair up a Peerless TC6F 2" with a GRS 8PR-8 8", but the price is 88 cents over budget. And there's not much info on the GRS 8".
Couple the TC6F with the 17.10$ 6,5" Peerless SDS-160F25PR01-08, and it's in a whole 'nother league. But still fairly cheap.

Could try just placing some pipe/cup on the back of the TC6F, use 1st order 400hz-1khz scavenged parts for xo.

Last edited by KaffiMann; 18th June 2018 at 12:09 PM.
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