15" 3-Way - Realm of Excursion



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Old 03-15-2016   #1 (permalink)
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Default 15" 3-Way

I'm stuck on an idea, need some help. I have 2 15" Celestions https://www.parts-express.com/celest...8-ohm--299-418 and my original idea of matching them with a 6.5" and titanium tweeter probably won't work. I put them side by side fed by a Power amp. It wouldn't be a problem if I kept them at the same volume all the time, but at normal or lower volumes the 15" overpowers the mid and tweeter. I think I need a better compression tweeter or 2 of these per cabinet: http://www.amazon.com/DS18-PRO-TW210.../dp/B00NJTNGTG

The cabinets will be 6.25 cubes, somewhere around 20x20x40". I was thinking of 1 cube foe the mid, ported @40Hz, but I don't need it that low in this build. I might even go with a 2-way, since the 15's are good in the midrange. I used them as guitar speakers until someone wanted to buy the cabinet they were in with 2 12's instead. I have not heard what kind of bass these can produce, hence the 6.25^ft3 cabinets. I need some help with a good crossover also. I have a couple built for the 6.5" and 2 different tweeters, 1st and 2nd order. I was just going to add a 100hz cap to the mid for the 15" and add an inductor after I listened to the final product.
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Old 03-15-2016   #2 (permalink)
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Default Re: 15" 3-Way

sealed??!!!!!
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Old 03-16-2016   #3 (permalink)
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Originally Posted by sri3850341 View Post
sealed??!!!!!
2 4" ports. I calculated 2" @46Hz instead of the suggestion on the PE page.
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Old 03-16-2016   #4 (permalink)
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Default Re: 15" 3-Way

If I understand what you are trying to accomplish, you have a "peaky" enclosure. If you want a flat response ie: 30-90, I would design a 4rth order, you'll get a flat response and won't be "peaky", or look into the dynamics of your amplifier, is it getting a strong supply of current at all times? Or are your highs just lacking and not properly matched to your subs?
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Old 03-16-2016   #5 (permalink)
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Default Re: 15" 3-Way

I have not yet built the enclosures. The 2 15" Celestions were in a 4.36^ft3 sealed enclosure, 6.5" and 1" titanium tweeter in a 1^ft3 @ 40Hz. The amp is at least 250w per channel @ 8ohms, and each driver is 8ohm nom impedance using 2 channels of the power amp.


My basic goal is to build some decent stereo speakers out of these, not PA speakers, but something that will handle wattage. I got some good horn suggestions, but I really don't have the space or the Hornresp skills or money to screw up. Gonna do some open-air and infinite baffle testing with all the same drivers later - I'm on permanent disability and there is only so much noise and lifting/moving I can do with chronic pain.

I'm very open to suggestions to different mids and tweeters. Right now I'm quite pleased with what the Pyle PDMW6 can do, and I have a GRS GT336 tweeter crossed at 4kHz. The sensitivity is pretty low on these, that may be the problem.
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Old 03-16-2016   #6 (permalink)
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Default Re: 15" 3-Way

well then are you running bi powered? if not, the key is going to be in your passive xover.....
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Old 03-16-2016   #7 (permalink)
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Default Re: 15" 3-Way

Nope, passive.
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Old 03-17-2016   #8 (permalink)
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Default Re: 15" 3-Way

then spend your energy and thoughts into the Xover network.... Partsexpress
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Old 03-17-2016   #9 (permalink)
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Default Re: 15" 3-Way

Okay, thanks.

Any tweeters or mids you would rather use? I might end up using the Dayton DC-28 silk tweeters, but they actually might not be bright enough. (did I just say that?)
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Old 03-20-2016   #10 (permalink)
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Default Re: 15" 3-Way

Dayton silk are for low level listening, they will blow with the slightest clipping... That's just my experience..
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Old 03-20-2016   #11 (permalink)
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Default Re: 15" 3-Way

I've decided on a 2-way design instead. Going by Celestion's suggestions and wasted time trying to make all 3 drivers behave together, the 15" woofer is flat to 4kHz and the 150 Tymphany tweeters I bought crossed @ 3kHz should do just fine. 3rd order for the highs, 2nd for the lows.

All I need now is wood and proper driver alignment - something I heard about...vertical null? It seems to be unavoidable, but everything horizontal and off-axis should be okay. Just need to place the drivers so that there isn't a time issue. I don't think vertical null will be an issue for anyone but the neighbors down the street.

So, how should I place the drivers for proper alignment? I only have my ears and a kickdrum mic to test with.
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Old 03-26-2016   #12 (permalink)
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Default Re: 15" 3-Way

Got the tweeters and crossover parts. Tested the tweeters and my are they are sensitive! Did a free-air with the 15" woofer and I think they will get along great together.

I think the cabinets are going to be 20"w x 40"h x 18"d. Monsters! These are going to be so loud the neighborhood will love me forever.

Now to get to work building the crossovers...
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Old 03-26-2016   #13 (permalink)
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Default Re: 15" 3-Way





Not too bad for a guy who could barely walk yesterday.

Where the hell is everybody? Hello to the stragglers following this.

Now to make some money to buy wood. I still gotta build an ottoman subwoofer for, believe it or not MY WIFE, and even MDF is going up in price. I might just spend the extra $15 and get birch ply for that too.

Also, any opinions on what I should cover them with - tolex is too expensive, but I saw some cool patterned vinyl at Hobby Lobby, and black carpet would be ok too. I don't think I want to paint them or stain them. What would ROE do?
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Old 03-26-2016   #14 (permalink)
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Default Re: 15" 3-Way

why

A little reading I did after the decision to just go 2-way with a radial horn tweeter. There was a write-up on dz time delay too (this guy is way beyond me in acoustical engineering), and it looks like I might have gotten lucky. Loud AND good sound.
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