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Old 5th May 2005, 08:06 AM   #1
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Default CSS Driver Idea

Hello, I am new to the world of DIY audio speakers, although I did construct a pair of Jordan fullrangers.


The new CSS 4.5'' driver intriques me, and I am curious as to why - if the driver is as good as some people here are saying it is - the driver is not being used by practically everybody. I heard one guy say it was better than the Jordan JX92S, which is considerably more expensive. If it is truly better than the Jordan, I will love this driver. People are saying that it has better bass response than any other driver about it's size, although the Jordan (which is about the same size) goes down to 40Hz whereas the CSS goes down to 60Hz. Is the bass response truly better?

The most frustrating thing about building the Jordan speakers was working with the cabinet. For this reason, I have an interesting design idea. Why not just load the CSS driver into an inverted horn lense (ala nOrh, but have it be a true horn lense)?

I was thinking something like this: http://www.partsexpress.com/pe/showd...Number=264-315

You would mount the driver on the mouth...would it work? Does the plastic rim surroundng the driver extend the diameter to about 6 inches for the CSS driver (I have had trouble finding dimensions)?
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Old 5th May 2005, 09:24 AM   #2
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Default Re: CSS Driver Idea

Quote:
Originally posted by Czilla9000
The new CSS 4.5'' driver intriques me, and I am curious as to why - if the driver is as good as some people here are saying it is - the driver is not being used by practically everybody.
It has been on the market for less than a year. People have been talking about and playing with ht Jx92 for nigh on 5 years now & it is just getting a big head of steam (not to mention that as a driver it goes back some 30 years -- i was playing with the 4" Jordan-Watts in 1975!!)

Quote:
I heard one guy say it was better than the Jordan JX92S, which is considerably more expensive. If it is truly better than the Jordan, I will love this driver. People are saying that it has better bass response than any other driver about it's size, although the Jordan (which is about the same size) goes down to 40Hz whereas the CSS goes down to 60Hz. Is the bass response truly better?
The 2 drivers are in the same league (until you throw price into the equation) The CSS trades going lower for a relative lack of top end. It is a fair compromise. The CSS gives up a bit of efficiency to the Jordan -- in this case a consequnce of the XBL which means less distortion. Really the Jordan is challenged to get to 80 cycles...

[/QUOTE]I[/QUOTE] was thinking something like this: http://www.partsexpress.com/pe/showd...Number=264-315

You would mount the driver on the mouth...would it work? Does the plastic rim surroundng the driver extend the diameter to about 6 inches for the CSS driver (I have had trouble finding dimensions)?[/QUOTE]

Interesting though... you would probably do better to go searching for clay pots as an alternative to these thou (been done with good success with the JX92) ... there are lots of object sthat could be repurposed for use with small speakers.

dave
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Old 5th May 2005, 04:20 PM   #3
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Default Re: Re: CSS Driver Idea

Quote:
Originally posted by planet10
The 2 drivers are in the same league (until you throw price into the equation) The CSS trades going lower for a relative lack of top end. It is a fair compromise. The CSS gives up a bit of efficiency to the Jordan -- in this case a consequnce of the XBL which means less distortion.
Dave, what tweeter would be a good match for the WR? I always liked the look of the G2Si + JX92 combo, but it seems like a WR125 + G2Si pairing would be very wastful of the tweeters 94 dB sensitivity.
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Old 5th May 2005, 06:15 PM   #4
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Default Re: Re: Re: CSS Driver Idea

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Originally posted by leadbelly
what tweeter would be a good match for the WR? I always liked the look of the G2Si + JX92 combo, but it seems like a WR125 + G2Si pairing would be very wastful of the tweeters 94 dB sensitivity.
Tim is successfully using the weird bezeled Fostex, if you just plan on letting the WR125 run full out it doesn't take much tweeter to fill in the top octave.

It may be sacriledge, but in our 1st crack at this puppy, we are going to waveguide load the ApexJr 50 cent tweeter. If we decide that doesn't cut it we will upgrade to the Audax gold dome version. In this ap, as general guidline, the smaller the tweeter the better.

I'll let you guys know how it works out when Scott brings the boxes down. (BTW i'd be happy to toss in a pr of Ts with any pair of WR125 purchased -- i note no one has mentioned the price drop in the WR125 -- at least the 8 ohm version)

dave
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Old 5th May 2005, 06:26 PM   #5
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If anyone wants to try the bipole before i get prototypes done... here it is (as big as will fit on the forum -- i can provide a larger -- ie readable -- pic directly)

dave
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File Type: gif bipole-wr125-v02-plans-tn.gif (36.5 KB, 621 views)
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Old 5th May 2005, 07:04 PM   #6
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The cab volumes were calculated around the WR125ST although the WR125S should work also. I like the way the WR125ST behaves with tube power, however, an interesting side benefit of the XBL^2 motor is it's stable impedance. You could parallel a pair of WR125S and be able to call it 8 ohm nominal as the low impedance point is still well above 4 ohms.
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Old 5th May 2005, 07:37 PM   #7
SCD is offline SCD  Canada
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Default Poking and proding

Good for you Dave:
A well worded poke for me to get on with the construction of the prototype.
I have been busy with the things I am told to do by "she who must be obeyed".
Right now is digging season and I have been mixing concrete and doing a lot of digging. I have learned better than to make any promises about when I will get the proto done but lets hope it is soon.
It might even be a plywood box this time!
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Old 5th May 2005, 08:05 PM   #8
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Quote:
Originally posted by Timn8ter
You could parallel a pair of WR125S and be able to call it 8 ohm nominal as the low impedance point is still well above 4 ohms.
Nice design. Is there an advantage to lowering the impedance?
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Old 5th May 2005, 08:12 PM   #9
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Default Re: Poking and proding

Quote:
Originally posted by SCD
I have learned better than to make any promises about when I will get the proto done but lets hope it is soon.
Some black 1354 phase plugs is on the top of your list (1 pr backordered)... speaking of phase plugs...Tim have you had a chance to try the 207?

dave
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Old 5th May 2005, 08:17 PM   #10
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Default Re: Re: CSS Driver Idea

Quote:
Originally posted by planet10
[B]The 2 drivers are in the same league (until you throw price into the equation) The CSS trades going lower for a relative lack of top end. It is a fair compromise.
I looked at the Jordan for a long time. The thing that kept throwing me was the rising frequency response. I know it's intended to counteract the beaming, and you're supposed to cross the driver paths in front of you. In my intended location I needed to have the driver firing straight ahead. Besides I've listened to systems where the drivers cross in front of the listening position, and I didn't like the effect.

Price wasn't a consideration in my case, nor was efficiency.
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