Help Converting Line array into multi-way system?

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#42
4" spacing at 3k5 will likely present its nulls at 30 degrees left and right.

Don't automatically assume that this is a bad thing, but you should consider that the horizontal nature of this is inconsistent. A typical narrow direct radiating vertical line array is interesting because it has obvious horizontal room reflections but a significant reduction in verticals.
 
#43
Ok,
At the risk of back-tracking, maybe I should return to my original idea of removing the 3" driver at ear-level, and mounting a tweeter (GRS 2522C-4 on order), to keep thing compact...

If I can use a 3kHz crossover and keep CTC spacing under 4" from tweeter, do you think the lobing would adversely affect the overall mid/treble response?

(Hope I'm not "whipping a dead horse"?)

Thanks
 
#45
How short can we make the "tweeter line" , if we center it at ear-level with the listener (for instance I have enough 3.5" tweeters to put 4 in a line, which is about 14" long)?

The proposed crossover is around 3kHz with a third or fourth order crossover slope.

A line of eight PTmini-6's per side (let alone more) is still out of my budget at the moment.

Thanks
 
#46
planet10 said:
Possibily an idea from left field.
12 drivers/array.
2+tweeter as an MTM, and then 8 or 10 as woofers to make a 3-way. Also potential to get things together in a way that allows a 2.5way.
dave
Click to expand...

Hi Dave!
Not too far afield-
I've already stacked a few test enclosures, and tried a simple (coil & cap) crossover to hear the combo. Sounds really promising-I'm using a pair of these for my TV sound at the moment (Not much bass extension or loudness capability without more woofer surface area). I wonder how to integrate these together with an array, as you suggested? Also, I'd like to use a better crossover for improved performance & driver protection.

I hope to settle on a configuration that will provide good balance between sensitivity and frequency/polar response. Of course, the more dynamic and lower distortion, the better.

Thanks
 

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#48
planet10 said:
...2+tweeter as an MTM, and then 8 or 10 as woofers to make a 3-way. Also potential to get things together in a way that allows a 2.5way.
dave
Click to expand...

Cool concept, although the clusters at top and bottom would be a challenge with my current baffles.

I've played with mocking up the MTM within a line format, as shown,but realize I need a to keep the baffle wider, and spacing as close as possible.

My current baffles are 60" tall by 6.5" wide,and I'm experimenting with chamfered/rounded edges to reduce edge diffraction.

I'm open to any idea, thanks.
 

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#52
Oh....
Sorry- I'm a bit confused. While I do get the part about crossing over above where problematic room reflections occur. But if the tweeter is supposed to "beam" in the vertical direction, and will be rolling off below 3kHz at 18dB/octave, why are we
so concerned with the ceiling, which is more than four feet away? Is it because it's the nearest highly reflective room surface?

Thanks.
 
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#60
AllenB said:
Are you familiar with reflections? Are you familiar with the purpose of the narrow dispersion?
Click to expand...

Reflections are indirect sound that can help or harm the overall sound in the room. Narrow dispersion can be used to minimize unwanted reflections, right?

I'm here asking for help toward building better speakers.
.
Perhaps someone else has a helpful post to contribute (?)

Thanks.
 
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