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Multi-Way Conventional loudspeakers with crossovers

The Pencil: inspired by Ohm Micro Walsh Tall
The Pencil: inspired by Ohm Micro Walsh Tall
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Old 21st February 2008, 07:04 PM   #11
Juspur is offline Juspur  Denmark
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Hi Tyimo
Well, what I wanted from this speaker - and what I got - is a speaker free of room resonanses, due to the omnnidirectional setup.

The midwoofer acts really funny - the bass is firing down the enclosure, while the midband is radiating both horisontally and vertically into the room. It's a true lucky punch - it feels like the speaker haven't got an enclosure (no resonances)

The midwoofer as well as the tweeter is connected in phase. I tried to reverse the phase on the tweeter, but preferred the in-phase-connection.

I also tried mounting the tweeter face down, but that was no succes, not even with a cone underneath for spreading purposes.
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Old 21st February 2008, 07:13 PM   #12
Tyimo is offline Tyimo  Hungary
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Thanks Jesper!

How did you calculated the box volumen? Like with a normal BR box??

Tyimo
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Old 21st February 2008, 08:00 PM   #13
Juspur is offline Juspur  Denmark
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Yes, I calculated it as normal BR box - guess the bass needs the same volumen, whether it's firing in or out. I used boxplot for calculation.
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Old 21st February 2008, 08:16 PM   #14
Renron is offline Renron  United States
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Quote:
Originally posted by c2cthomas
Similar to this: http://www.diyaudio.com/forums/attac...amp=1176356499
Perhaps a little of Mamboni Magic or BudP EnABL Voodoo!!! I have found that my Walsh 5 remakes are very nice speakers in respects to being an "omni" directional type of speaker. I find them great for my HT and general listening.
Great Ideas going on here. It is something I have been thinking about building.
This pic (link) reminds me of the Robot in "Lost in Space".
No offense intended.
Ron
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Old 21st February 2008, 08:30 PM   #15
OhioTanner is offline OhioTanner  United States
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juspur...nice job, dude!
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Old 22nd February 2008, 04:26 AM   #16
nebojsa is offline nebojsa  United States
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Location: seattle wa
Juspur, love your design and seems well finished. Ahh the pencil case, what a touch!! Looks nice and simple. Quick question, the foam in the middle of your cabinet how is it attached? Oh and one more, how is the soundstage with down firing woofer? This is the first time I've seen design like this, yes I am a novice, with down firing woofer, the advantages? Thanks
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Old 22nd February 2008, 05:22 AM   #17
Tyimo is offline Tyimo  Hungary
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Quote:
Yes, I calculated it as normal BR box - guess the bass needs the same volumen, whether it's firing in or out. I used boxplot for calculation.
Thanks Jesper!

Tyimo
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Old 22nd February 2008, 04:17 PM   #18
MisterTwister is offline MisterTwister  Tibet
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looks great! Jesper. simple and quite elegant.
I was going to try similar design, but with 8in beyma woofer. some woofers scream, when run unfiltered(even off axis) , some don't. I haven't heard too many woofers, but it appears that polycones are the best for using without crossovers. I suppose mounting woofer upside down should also reduce screaming.
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Old 23rd February 2008, 11:17 AM   #19
Juspur is offline Juspur  Denmark
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Hi Renron
What a link
Absolute absence of WAF
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Old 23rd February 2008, 11:21 AM   #20
Juspur is offline Juspur  Denmark
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Hi Nebojsa
The soundstage is very natural - I tried somehow to explain it in post #11 - but it's simply natural, if you think of acoustic presentations (jazz bands, symphoni orchesters etc.).

The foam is simply glued with contact-glue on the three contact-sides, and mounted in the enclosure.
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