Cheap tweeters for a 15" woofer. - Page 2 - diyAudio
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Old 5th January 2014, 01:53 AM   #11
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Quote:
Originally Posted by tkroeker View Post
I re read your initial post. I thought you were making a single speaker cabinet. What is the use going to be?
I want to use a 2'x2'x2' cube with a 15" woofer for lows and mids. I need something for the highs. I want it to be a separate enclosure, perhaps 2 separate enclosures so I can have stereo sound.

They'd be used for very loud listening in a pretty small room. I just want something nice and crazy to go with my crazy woofer.
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Old 5th January 2014, 04:23 AM   #12
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Originally Posted by TheTubeAmper View Post
I want to use a 2'x2'x2' cube with a 15" woofer for lows and mids. I need something for the highs. I want it to be a separate enclosure, perhaps 2 separate enclosures so I can have stereo sound.

They'd be used for very loud listening in a pretty small room. I just want something nice and crazy to go with my crazy woofer.
That's not gonna work very well(sound very good) unless you have 2 complete speaker systems(2 woofers and 2 tweeters) or if you make the 15 a dedicated sub from 100hz down and cross over to a pair of "fullrange" speakers that cover everything else. A super tweeter is not what is used with a PA woofer in a fullrange system either, you want a more capable driver that can be crossed over at no more than 1.5k to 2khz ideally..
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Old 5th January 2014, 04:46 AM   #13
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Originally Posted by conanski View Post
That's not gonna work very well(sound very good) unless you have 2 complete speaker systems(2 woofers and 2 tweeters) or if you make the 15 a dedicated sub from 100hz down and cross over to a pair of "fullrange" speakers that cover everything else. A super tweeter is not what is used with a PA woofer in a fullrange system either, you want a more capable driver that can be crossed over at no more than 1.5k to 2khz ideally..
Why can't I have the sub do from 2KHz down, and then have some tweeter do the rest, or possibly two tweeters do the rest?

I'm pretty confused by most of what you said, anything after "A super tweeter" and I'm lost. I don't know what a super tweeter is, what you mean by fullrange system (I know what fullrange means but not in PA context), and which driver you were talking about.

EDIT: Also I'm not sure what your standards for "good sound" are, but with JUST this 15" woofer at half its rated wattage, running full range, I was more than happy with how it sounded, the highs lacked quite a bit but it still sounded amazing.
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Last edited by TheTubeAmper; 5th January 2014 at 04:52 AM.
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Old 5th January 2014, 07:42 PM   #14
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Originally Posted by TheTubeAmper View Post
Why can't I have the sub do from 2KHz down, and then have some tweeter do the rest, or possibly two tweeters do the rest?
OK lets clarify a few things, that 15" driver you have is not a "sub" by any standard.. home audio or PA. We know this by the very fact it plays up into the kilohertz range, if it was a subwoofer it simply would not do this. The high frequency driver(tweeter) you need to pair with this needs to be capable of covering from about 2khz up, a super tweeter is not really capable of going that low they usually are limited to frequencies above 5-8khz or just the very top of the spectrum where the instruments like cymbals reside, if you try to make it play lower it will distort very easily.

A crossover is a filter network that is placed between the amplifier and speakers to limit the audio spectrum each driver sees, this is necessary to protect the drivers and to ensure they play together as smoothly as possible. You will need a crossover to add a tweeter of any type to your system, and at the very least this will consist of a capacitor and a resistor in series with the tweeter to filter out low frequencies and reduce the overall tweeter output level to match the woofer.

For PA applications the spectrum can be broken down like this.

Sub: 30hz to100hz
Bass: 100hz to 250hz
Mids: 250hz to 5khz
Highs: 5khz to 20khz.

You will notice that these divisions do not correspond with the crossover frequency suggested for your speaker system, this is because you are only going to have a 2-way speaker system so compromises have to be made to make the best of it. That's what we're really talking about here the best compromise for your setup, there are lots of different drivers you could use I'm just trying to suggest something that I know will work better. Here a driver/horn combo that should do what you want without breaking the bank.

Pyle PDS182 1.5" Titanium Horn Driver 8 Ohm | 292-2618
Goldwood GT-400PB 1" Horn 1-3/8"-18 TPI | 270-095
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Old 5th January 2014, 07:53 PM   #15
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Originally Posted by conanski View Post
OK lets clarify a few things, that 15" driver you have is not a "sub" by any standard.. home audio or PA. We know this by the very fact it plays up into the kilohertz range, if it was a subwoofer it simply would not do this. The high frequency driver(tweeter) you need to pair with this needs to be capable of covering from about 2khz up, a super tweeter is not really capable of going that low they usually are limited to frequencies above 5-8khz or just the very top of the spectrum where the instruments like cymbals reside, if you try to make it play lower it will distort very easily.

A crossover is a filter network that is placed between the amplifier and speakers to limit the audio spectrum each driver sees, this is necessary to protect the drivers and to ensure they play together as smoothly as possible. You will need a crossover to add a tweeter of any type to your system, and at the very least this will consist of a capacitor and a resistor in series with the tweeter to filter out low frequencies and reduce the overall tweeter output level to match the woofer.

For PA applications the spectrum can be broken down like this.

Sub: 30hz to100hz
Bass: 100hz to 250hz
Mids: 250hz to 5khz
Highs: 5khz to 20khz.

You will notice that these divisions do not correspond with the crossover frequency suggested for your speaker system, this is because you are only going to have a 2-way speaker system so compromises have to be made to make the best of it. That's what we're really talking about here the best compromise for your setup, there are lots of different drivers you could use I'm just trying to suggest something that I know will work better. Here a driver/horn combo that should do what you want without breaking the bank.

Pyle PDS182 1.5" Titanium Horn Driver 8 Ohm | 292-2618
Goldwood GT-400PB 1" Horn 1-3/8"-18 TPI | 270-095
I realize its a woofer, not a subwoofer, when typing fast I mess things up. As far as crossovers go I want to use an active croosover on the line level and do either bi or tri amp setup.

I'd seriously consider a super tweeter with a nice 8 or 10in woofer to handle mids and highs, so long as I can find a good deal on a woofer and tweeter, enclosures are not a problem.

The links you've provided aren't too expensive but I could probably get a supertweeter and woofer for the same price to do the same thing (I like buying used things on eBay) don't you think?
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Old 5th January 2014, 07:55 PM   #16
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If you are making a "stereo" system then you need two of everything. The exception is to have one sub since your ears can not detect where things come from below real low freqs.

You can do a system however you want and how you find pleasing but what you will eventually find is: to use your 15 as a "sub" and cross it over below say 80 - 100+ hz. add two low/mids that are 8s to 12s, add tweets. these will need crossovers so they only get midrange sounds to the mids and high sounds to the tweeters. DIY audio is fun and does take some learning but the better you get at it the more you will like it.

I am working on some steps for you and speaker suggestions to get you up and running. What amps/ receivers are you using besides the one mentioned?
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Old 5th January 2014, 08:03 PM   #17
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So lets say I were to do this:

single 15" running 0-2KHZ on a pro amp (to be obtained and repaired soon)

2x enclosures, each with a supertweeter doing 5KHZ-20KHZ and a 8" or 10" woofer doing 2KHZ-5KHZ. With both of those on a drivers in a single enclosure on a 150WPC RMS very nice home audio amp, or possibly with just those 8" or 10" woofers on a 150WPC RMS very nice home audio amp, and just the supertweeters on a 60WPC RMS Home Audio Reciever.

Wouldn't that be good (given that I find 8" or 10" woofers with the correct frequency response)?
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Old 5th January 2014, 08:04 PM   #18
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Your system just needs a couple of things to be pleasing and I understand you dont want to spend a lot at this time.

This is an example of the big picture. It is intended to show how seperation of frequencies and speakers can play different rolls for a large sound. As you add and develope I hope this helps answer questions.
http://cdn.avsforum.com/4/4b/4b71c328_THTRvisio.jpeg
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Old 5th January 2014, 08:09 PM   #19
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So lets say I were to do this:

your close for a "step up". Give me a couple to rearange and make crossover suggestions...
Your getting the idea..
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Old 5th January 2014, 08:18 PM   #20
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Running the 15" up to 2kHz, and then having two boxes go from there would sound very weird. The guys above were pointing you toward a 2.1 system - two nearly-full-range boxes (bass-limited), and then use your 15" for a subwoofer to cover the low frequencies. Sounds like you rather like the 15" driver, and want to keep things simple, soooo....

I'd not bother with going stereo - save your money, stay mono, get a decent-ish compression driver on one of those QSC waveguides from Parts Express.
Cross over at 2.5kHz, 2nd order (though higher order would be better here), and add a touch of eq to taste.

Its simple, easy, and loud.

You'd be able to fix most issues (BSC, stuff like that) with eq. Both drivers would be reaching out slightly to meet the other, so the midrange might be a tad rough, but hey, people use worse set-ups than that every day with no complaints.

Chris
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