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Old 8th April 2007, 09:46 AM   #51
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Quote:
Originally posted by PoorSound
yeah im interested! we can't use the peerless tweeter instead?
The problem is that I have a 'design' - and it hasn't been modeled/developed with the HDS tweeter. All this was done before HDS tweeter came along. Sorry, but it's a case of what we've got versus speculation adding a totally different tweeter. BTW, the XT25 tweeter may have an advantage here, being a centre channel, with its more limited dispersion? As far as timbre goes, this will match what you have nicely. Trust me on that.

Joe R.
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Old 9th April 2007, 08:12 PM   #52
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i've always thought u needed the exact same drivers to timbre match! that's news to me.

What mid/woofers are you using in the design?
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Old 9th April 2007, 11:41 PM   #53
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Quote:
Originally posted by PoorSound
i've always thought u needed the exact same drivers to timbre match! that's news to me.

What mid/woofers are you using in the design?
It's the smaller 5 1/4" brother of the 6 1/2" drivers you are already using. That will certainly match timbre. I did this design with XT25 tweeter. I could have done it with the new HDS tweeter but it was not available to me then. If I was to change the tweeter I would have to redesign from almost scratch. You could try the crossover you have used for the HDS in the Elsinores, but the series R would need to be increased and the series C would need to be reduced. Using the existing Lo-Pass filter on the 5 1/4" as is (I would send you that), then tune C & R to HDS tweeter by ear. Are you keen on doing that?

I prefer to use our modeling techniques and not publish speculation. When changing a driver in a design, I never start in the middle, I always go back to the beginning from scratch. All raw measurements pre-modeling needs to be done at the same time or inconsistencies (and nagging doubt) can affect the result. We have developed a very specific form of modeling that takes out a huge number of variables and with discipline you CAN reliably get predictable results - compliance between real world and what you see on the computer screen.

Up to you. Try HDS and tune series C (needs to be lower than 4uF) & and series R (needs to be higher than 4R) - keep the 0.82mH choke and 68uF notch filter. I will supply box info etc.

Joe R.
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Old 10th April 2007, 12:48 AM   #54
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unfortunately, i know NOTHING about designing crossovers! i guess what your saying, is if we substitute the vifa for the peerless tweeter, you will have to completely redesign the crossover?

next, is it a MT, or MTM design?

thanks alot for your help joe, its very appreciated.
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Old 10th April 2007, 01:26 AM   #55
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It's just MT. You could build a pair and you would have them as optional mini-monitor(s) that can be taken on the road/highly portable.
Believe me, it's very good and surprising bottom end for the size.
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Old 10th April 2007, 06:17 AM   #56
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it might be ideal for me to build 3 of them and have two for the rears as well, hey?
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Old 10th April 2007, 06:23 AM   #57
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Quote:
Originally posted by PoorSound
it might be ideal for me to build 3 of them and have two for the rears as well, hey?
BRILLIANT!
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Old 10th April 2007, 02:11 PM   #58
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are ya gonna give up the details!? haha
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Old 10th April 2007, 11:03 PM   #59
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Quote:
Originally posted by PoorSound
are ya gonna give up the details!? haha
OK, give me a little time to put things together.

Joe R.
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Old 16th April 2007, 02:02 AM   #60
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Quote:
Originally posted by Joe Rasmussen


OK, give me a little time to put things together.

Joe R.
The "JR Minis" - also useful as centre channel - in which case build three and (hint to anybody interested) and use Elsinore as main Left & Right. In that case no real need for a sub. Anyway, that's the idea presented here.

Also quite nice as a small stereo pair.

First the box:

Click the image to open in full size.

Click the image to open in full size.

How you make the box is up to you. Please note the tweeter is below the 5 1/4" driver. They are designed for stands 600mm high. If used as a centre speaker and mounted above ear height, then use the tweeter on top. The basic thing to remember is the tweeter needs to be as far away from the listener and the 5 1/4" PPB HDS driver closer.

The rear cut-out - needs to match the dimensions of whatever terminals you use.

The Tweeter must be flush mounted and 5 1/4" PPB driver not.

Stuffing: I used wool/dacron (polyester) bats. Cut a piece that covers half of the volume behind main driver towards the rear only - keep some space behind the driver itself. Lower half of volume, line only with 20mm thick - keep space as much as possible near the internal port exit - breathing space.

Next installment will be the crossover.

Joe R.
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