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Old 21st March 2011, 03:54 PM   #1
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Default Crossover recommendations and costs

Crossover 3-Way 8 Ohm 800/5,000 Hz 100W

Are these way too cheap? I'm building a set of speakers withI'm planning to pad the tweeter with a pair of resistors, but that's it.

The idea is to make an "okay" set of speakers, hopefully better than the JBL micro-surround system we have now, on the cheap.
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Old 21st March 2011, 05:39 PM   #2
tinitus is offline tinitus  Europe
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those peerless are midrange drivers
no bass from those

looks like a fun project with those JVC
but if you want a good speaker, better find a well designed and measured project
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Old 21st March 2011, 06:02 PM   #3
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I'm planning to make the outside dimensions of the box 2.5" wide, 22.5" tall, at least for the fronts. That way, it will match the TV quite well.

What about 1xPeerless 830855 as a woofer?

Right now, I actually have one of each of the JVC drivers and the ND20fa up front, and they don't sound too bad. The little thing sticking off the top of the enclosure the JVC comes in is a piece of cardboard glued in. I pushed that out and pressed the ND20fa into it, and put a 2.2uF cap on the ND20fa. Way too much trebel right now, but I haven't gotten around to padding it yet. Anyway, once I'm at four rather than one JVC, shouldn't need as much padding.

I intend to make the whole thing out of 1/4" mdf with a bit of bracing. The JVCs and Dayton will share a 2"x22"x1.5" sealed box, and the Peerless will get a 2"x22"x3.75" box ported to 63Hz with two 1" long .7"x.25" ports on either side of the tweeter.
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Old 21st March 2011, 08:50 PM   #4
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You know, the verry first problem You will face with that crossover is:
it will not do what You would expect from it to do.
Passive Crossover Network Design
The above article will show You why.

I can absolute guarantee if You just purchase an xover, it will do You not good at all.
Probably You Should follow the article, and design Your own, with the mentioned impedance correction networks.

Then it will be close to what You want on paper.
And who knows, You might even find more suitable xover points for Your system.


Anyways, You want it cheap, right?
now let me see Your budget first.
2xPeerless India W3-LK76-PBK will cost like 11$
4xJVC 1" x 4" Full Range should be like no more than 8 $
1xDayton ND20fa is around 7$.
Now, let us sum it up, it yields whooping 26 $.

now do not get me wrong, budget system IS a budget system.
So lets look at what we could get for that money

I would go for a 2way system.
Less problematic to design, and less needs to spent on drivers.
Phenolic Ring Tweeter 4 Ohm

thats not a too bad tweeter for this price IMHO.
1078 Hz Fs *hints* that a 2nd order crossover at around bit over 2 Khz will be fine for this thingy.
7$ we spent, so we got 19 $ for a suitable midbass unit.
http://www.parts-express.com/pe/show...number=295-305

That looks like a good bang for them bucks!
17$, and it will probably do just fine with the 2Khz -ish xover point.
0.361cuFt, and tuned to somewhere bit under 50 hz it will give you a verry decent sound down to somewhere 50-60 hz.

If you ask me its the way to go.
The woofer has sufficent documentation to create a proper impedance correction network for it, and the tweeter might just get away without it.
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Old 21st March 2011, 08:59 PM   #5
tinitus is offline tinitus  Europe
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Quote:
Originally Posted by Arty View Post

I would go for a 2way system.
Less problematic to design, and less needs to spent on drivers.
absolutely, yes

a 3way is basicly 'not really a budget approach'
a 2way will sound better, almost by itself
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Old 21st March 2011, 09:03 PM   #6
graaf is offline graaf  Poland
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Quote:
Originally Posted by tinitus View Post
absolutely, yes

a 3way is basicly 'not really a budget approach'
a 2way will sound better, almost by itself
hi tinitus! http://www.diyaudio.com/forums/multi...ml#post2509339 - pleeeeeease!
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Old 21st March 2011, 10:01 PM   #7
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at worse one thing is sure.
a single 6.5" midbass will be better than 2x 3" ones.
those will not realy go under 100 hz or so.
Thisone will go down to 50ish.

bass is just 1 thing.
but still, i would strongy advice to stick to 2 way designs.
creating an xover for a 3 way system is a major headache.
purchasing an off the shelf xover for a 3 way system is most likely be disapointing at the end.
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Old 21st March 2011, 10:39 PM   #8
tinitus is offline tinitus  Europe
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Quote:
Originally Posted by graaf View Post
hey graaf, havent read that thread
I will look into your kind request

sorry guys, just a small offtopic note to graaf
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Old 21st March 2011, 11:05 PM   #9
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Quote:
Originally Posted by Arty View Post
You know, the verry first problem You will face with that crossover is:
it will not do what You would expect from it to do.
Passive Crossover Network Design
The above article will show You why.

I can absolute guarantee if You just purchase an xover, it will do You not good at all. Probably You Should follow the article, and design Your own, with the mentioned impedance correction networks. Then it will be close to what You want on paper. And who knows, You might even find more suitable xover points for Your system.
Ok, I'll read that after work tonight.
Quote:
Originally Posted by Circuitsoft View Post
I'm planning to make the outside dimensions of the box 2.5" wide, 22.5" tall, at least for the fronts. That way, it will match the TV quite well.
Part of the reason to go 3-way is to have the woofer limited to frequencies where putting it on the side won't matter.

Quote:
Originally Posted by Arty View Post
Anyways, You want it cheap, right?
now let me see Your budget first.
2xPeerless India W3-LK76-PBK will cost like 11$
Looking at 1xPeerless 830855 now, $12.
Quote:
Originally Posted by Arty View Post
4xJVC 1" x 4" Full Range should be like no more than 8 $
4*$1.75=$7
Quote:
Originally Posted by Arty View Post
1xDayton ND20fa is around 7$.
Now, let us sum it up, it yields whooping 26 $.

now do not get me wrong, budget system IS a budget system.
So lets look at what we could get for that money

I would go for a 2way system.
Less problematic to design, and less needs to spent on drivers.
Phenolic Ring Tweeter 4 Ohm

thats not a too bad tweeter for this price IMHO.
1078 Hz Fs *hints* that a 2nd order crossover at around bit over 2 Khz will be fine for this thingy.
That's slightly more expensive than the tweeter I picked out, and a "last faithful reproduction" of what, from my reading, is actually not that good. Specs say it's good down to 2khz. ND20FA is good down to 3.5Khz. Also, since diaphragm is wider, I expect more sound beaming. JVC1x4s have pretty decent on-axis treble, but it falls off when off-axis in the long direction. The tweeter is to help that since the TV is mounted up high.
Quote:
Originally Posted by Arty View Post
7$ we spent, so we got 19 $ for a suitable midbass unit.
http://www.parts-express.com/pe/show...number=295-305

That looks like a good bang for them bucks!
17$, and it will probably do just fine with the 2Khz -ish xover point.
0.361cuFt, and tuned to somewhere bit under 50 hz it will give you a verry decent sound down to somewhere 50-60 hz.
Since it's a 6.5" woofer being used in midrange, it must be pointed out and can't be side-firing like I was planning with the woofer in my three-way. Anyway, this is to replace satellites in a JBL Micro-speaker system. Also, I can't use that woofer in my 3-way design because the mounting depth is too deep to fit in a 2.5" wide box.

Quote:
Originally Posted by Arty View Post
If you ask me its the way to go.
The woofer has sufficient documentation to create a proper impedance correction network for it, and the tweeter might just get away without it.
I could measure impedance/phase of the speakers if I want to, but I don't think it'll take much to beat the pants off the JBL microsystem.
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Old 21st March 2011, 11:20 PM   #10
AEIOU is offline AEIOU  United States
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You need to match the SPL levels of all the drivers. The JVC thing is way down there, only 80dB. The ND20FA is a good tweeter. I just bought a dozen of the ND20FB
A nice two way is smarter/better. A 6 1/2 inch woofer and 1 inch dome tweeter is the epitome of a two way. Stay away from the phenolic ring tweeter and get a 1 inch dome tweeter instead of a 3/4 inch dome tweeter.
Lots of plans/kits available. Have you been over to the Madisound website? The have a two way kit featuring AURA woofers and VIFA tweeters along with a high quality custom dedicated crossover.
---->https://www.madisound.com/store/prod...oducts_id=9038

Last edited by AEIOU; 21st March 2011 at 11:23 PM.
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