Open baffle Line array

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#21
array

Carpenter: fun project. can you post a backside photo?

Norman Bates: I thought that the JBL he was using is a 2404 tweeter, crossed at 10k. The 2342 and 2344 are much bigger. The 2344 being 12" x 12". Maybe I missed the size of his drivers in the array, I thought they were smaller. Out of curiosity, where are you in Iowa? I'd like to get a club or something going to experiment with construction techniques.

Thanks!
 
#22
foam surrounds on the CV? - if so do they seem pretty good? - got a bias against foam- not like I'll last enough to wear out another set - just the idea of eventual foam rot and grief its given in the past :^) Seas foam woofer surround lasted about a decade in the horrible conditions of my area
 
#23
Backside snapshot:
 

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#24
freddi said:
foam surrounds on the CV? - if so do they seem pretty good? - got a bias against foam- not like I'll last enough to wear out another set - just the idea of eventual foam rot and grief its given in the past :^) Seas foam woofer surround lasted about a decade in the horrible conditions of my area
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New foams don't rot, I believe. I had an old pair of JBL 15" woofers die from foam rot, so I know it's an issue in older speakers.
 
#26
zobsky said:
Unsolicited comments, but IME, ..

The advantage of a single tweeter over a tweeter line is that you don't need to deal with A LOT of drivers and you can cross over lower to match the woofer line roll-off (more obvious in a ine array) assuming your single tweeter can handle it. This is more significant when you use larger drivers. Also, you don't have to deal with tweeter treble roll off above 10 - 14 KHz (depending on the dimensions of your tweeter) and / or EQ.



The disadvantage of a single tweeter is that it loses SPL twice as fast as the woofer line (circular tweeter wavefront vs cylindrical woofer line wavefront). What this means is you MAY need to adjust the tweeter padding if the speaker - to - listener distance changes over time. Also, the soundstage changes drastically when you stand up since you're only being directly assaulted by the woofer line at that point.


Pick your poison 🙂
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My thoughts, exactly. One strong advantage to the line array over the point source tweet is that the horn's strength can be better matched to the woofer with distance.

Thanks for your input.

Damn, wouldn't it be nice if we all lived in the same local? I would love to have my DIY friends listen to my accomplishments and visa-versa.
 
#27
freddi said:
I don't believe that - seems like "eventually" (?) hows your rig sound on various vocals? - (lets say Mario Del Monaco) - is it easier to call Steve for orders than online?
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Yes, it's easier to call Steve.

Vocals seems fine to me. My wife says they're a bit weak, but then again, she has hearing like a bat. This driver was originally intended to be a midbass unit. Frankly, I think it covers midrange quite well. I purchased the last 65 M&K 3" drivers from Steve in order to see if I can get a midrange that suits my wife.

But honestly, I love the sound as is. They're beginning to break in and get smoother sounding every day. I may just run the 3" drivers in a separate baffle.
 
#28
thanks. those M&K looked like a great deal - hope they work out well for your wife.- -forgot to ask - which tapped horns did you build? - if the CV play acoustic bass, cello and a variety of drums better than some more expensive approaches then they should be great for me
 
#29
Tapped horn...

I built an 18" version of a tapped horn I saw on William Cowan's website.

The mother is 8 feet tall and 24in x 24in side to side. I turned the inner baffle corner to corner to remove parallel walls.

Pinks Floyd's "Breath" damn near got me a divorce. My wife was pissed for days--just hated the horn, said it hurt her heart.

I love it and, fortunately, got to keep it--just as long as I play it hard when she's out on an errand, or out of town.

This thing has the power of 4 18" drivers in a reflex cab. It also plays first octave like crazy. What a monster I've created.😉 😀 😉
 
#34
0.68uF to a Polydax PR120 came in around 6Khz as indicated by the yellow trace below - I might try that tweeter if pick up on CV - dunno if will keep up
An externally hosted image should be here but it was not working when we last tested it.


~35 years ago i had Maggies then 1D so got used to dipole that way - 1D was cool on stuff like Slam Stewart, Jo Jones & Milt Buckner trio - if some Chinese (?) CV and a tweeter can get some of that for lo-dough then great
 
#35
Jeez freddi, thanks for the graph.

It just occurred to me that there's an impedance rise in the tweet at high frequencies. It might be crossing the driver lower than the calculator suggests. Thanks for the tip.

Yep, I just tried 16ohm on WinISD and it depicts the crossover point at 10k. I'll look up some old specs, see if JBL posts the impedance rise.
 
#40
thanks - on the cheap one CTS piezo on a stepup transformer might get around 103dB/2.83v sensitivity to do HF - do you see much cone excursion on heavier bass passages and big drums? I'm lookin' for more drum based cds with good recording quality - got any suggestions?
 
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