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Some follow up on the Olson modified monsters

Posted by gopies (A) on June 23, 2007 at 06:43:20

In Reply to: RE: Olsen Modified BLH monster posted by Paul Eizik on June 22, 2007 at 10:20:30:

Hi all who have responded; thank you very much
Currently the tannoys i have a cross over ~1khz from my understanding. Unfortunately, it's a long story, but what I though I bought (ye, you guessed) from ebay, 2 'gold' drivers with the appropriate cross overs. Unfortunately I found out too late that one of the drivers is a HPD 385, and the other a monitor gold. Even worse, the monitor gold has been reconed to a HPD! Ok, can i get worse? Well, ye it does..........the cross overs are actually for monitor reds.
Oh well, the pitfuls of ebay.
Anyway, I have always been fascinated by the tannoys. I have been fortunate to locate a single HPD 385, so at least can match one of the drivers. I have to build a new cross over of course.
As Paul has mentioned in the replies, he based his diagram on the Paudio's initially. I did have the paudio's in an OB arrangement, but the lack of bass and the limited breadth/soundtage, led me to the 'next step'; horn enclosures.
i suppose it's a natural progression.
In any event, i don't think i really ever got them 'singing' at all, and especially with the cross over. The tannoys have much more info on them. I was particularly interested in the tannoy GRF autograph, a compounding horn. But as Paul said to me, he thought other designs would surpass the Autographs sonically, hence pressing ahead with this design by Paul.
I haven’t as yet fully grasped all the theory. Thanks again Paul for answering some of the questions raised. My problem is that I know no one here in Melbourne embarking or gone through horn systems. I don’t have a point of reference, and indeed as Paul has said, distance from opposite sides of the world has been helped with modern technology.
I don’t have any measuring equipment as yet, but hope to soon. I have the stereophile test CD’s.
I will however experiment with the sound with the ‘tuning’ section to put behind the driver. I will also try a smaller opening linking the manifold section to the ‘S’ area too. A smaller, or larger opening will, from my understanding, affect woofer sensitivity. How much will it affect bass extension? Which way?
May I ask advice from others too please, as to what the coupling chamber will therefore do to the cross overs of this dual driver (tannoy)? Do I look at a different cross over to what is recommended for the drivers? Ie, to take into account the coupling chamber? Also, do I look at possibly that the horn enclosure should be just for a bass driver eg JBL2235H?and use a seperate horn tweeter for the mid/top end? Would this be sonically superior to a ‘single full range driver’?
The tannoys cross over at about 1Khz. My understanding is that they area second order cross over, with a notch to stop a peak at 3khz.
The tannoys have a wonderful midrange so far. Playing organ music with the lows has never been better from what I have heard previously. And I haven’t began to find where it can be improved more
Thanks to all for your kind encouragement and support, it is greatly appreciated.
I look forward to your replies and suggestions
best wishes
john
ps, I have shown a pic of the opening from the manifold section to the 'S' area. It is ~7" long, and ~3 1/4" wide

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