4 x CHBW + RBT95SQ Ribbon Tweeter

[Rullknufs]

Looks like an interesting project! Is there any thread for the Edingdales too?

[Toppsy]

There are a couple threads on the Rossendales.
This is the main one:
audio-talk :: View topic - EDINGDALE speaker build

And then there is this:
The 'Dales' 2-way speakers

[pauldune]

isnt 3.5 Khz a bit low XO for the monacors?
I used them with an alpair 10 (gen1) and crossed them at 10kHz.
I thought 5Khz 2nd order or higher was the minimum XO frequency...
What order are you using?
By the way; they do sound nice for the price

Paul

[Toppsy]

Hi Paul,
As you say the recommended XO is 5kHz, but if you check out the published FR for the ribbon it is still at around 97dB at 3.5kHz. I considered that was the lowest usable frequency of the ribbons which are a published 98dB efficiency and at that point on the MA Woofer#6 (CSS EL166) FR plots there is still no apparent sign of cone break up. Looking at the woofer FR plot I wouldn't want to XO any higher than 4kHz. Checking out the FR plots for the CHBW they appear to nicely XO at the same frequency. I am therefore going to use the same XO in this design and see how it goes. However, I must say I haven't noticed any issues with the ribbons at this XO frequency so the proof of the pudding is in the trying.

I use a second order XO on the ribbon and also a adjustable L-Pad rather than fixed resistor L-Pad. I have found this a useful feature as I find changing from vinyl to CD source I sometimes need to adjust the treble attenuation a little down for some over harsh CD recordings.

[pauldune]

Hi Toppsy,

I would recommend caution, at 3.5 kHz the maximum power rating is way lower, and you have to consider that the speaker doesnt stop at the xo point. It has to provide some reasonable good quality sound 2 octaves below the xo point. (for the tweeter)
(and of course the opposite for the woofers)
The L pad helps with the power rating....

Paul

[planet10]

Originally Posted by Toppsy

Anyway no doubt Dave will explain his reasoning when he gets around to making these. Or more like should I say when Chrisby gets around to building the cabinets.

I've always hankered to do this kind of 3-way. I have the drivers. DaveR has done the hard part of the XO. It is not going to be easy to get Chris excited enuff to build the boxes.

dave

[Scottmoose]

Re Colin's choice of XO, I haven't heard it, but I do know that everyone who has (it's essentially the same as he uses in his larger Edingdales) likes the results. So while technically speaking I'd agree it doesn't appear ideal, I defer to their practical experience. One day, hopefully I'll get to hear a pair.

[chrisb]

Originally Posted by zman01

DaveD and 3 way in one line - sure it's not a typo?

in his younger days, I'd say almost typical


oh, right --- loudspeakers


the XO in the last 3-way loudspeaker chrisby built had a higher parts count than some of his amps:

[chrisb]

Originally Posted by planet10

It is not going to be easy to get Chris excited enuff to build the boxes.

dave

he has been lazy lately - maybe send him the drawings

[Toppsy]

Now come on Chrisby, you know deep down you are intrigued to know how they will sound. And lets face it they are not that difficult a build for a man of your talents Should be able to knock up a set of test mules in a weekend, surely