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Multi-Way Conventional loudspeakers with crossovers

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Old 18th November 2012, 01:00 PM   #61
system7 is offline system7  United Kingdom
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It's kinda tragic that most of the British sound has been outsourced to China.

I do remember having a look at some Tangent stuff. The fact is the drivers have come a long way since bextrene bass and the T27 mylar tweeter. But I want to try a mylar tweeter soon.

Metal and ceramic domes do seem to work best with a soft surround to tame the HF resonance. Joachim Gerhard and Harbeth favour this SEAS 22 TAF/G with some mods to the phase plate in their "cheaper" models. AFAIK, Harbeth use a SEAS Excel tweeter in their best models.
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Old 18th November 2012, 01:06 PM   #62
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The SEAS Excel stuff is different...I've heard them as well...a buddy has had many drivers in that line...he is pretty now all switched over to Accuton...dare I say "ceramic"?? LOL!!

But ya...the Excel drivers are nice...nicer than the Prestige for sure...they sound more alive!!

Another question while I have you here...any suggestions on components for the xover?? I just used some standard stuff from Madisound...

The Madisound Speaker Store

The Madisound Speaker Store

The Madisound Speaker Store
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Old 18th November 2012, 01:20 PM   #63
system7 is offline system7  United Kingdom
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Lynn Olson is of the opinion that a low DC resistance on the tweeter coil is a good thing to reduce IM distortion arising from low frequencies getting through. Otherwise, it is questionable if you need to spend huge amounts on crossover components.

Alan Shaw of Harbeth is happy with wirewounds and smallish polyesters (MKT) on his top model. He also thinks that removeable panels are a GOOD THING!
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File Type: jpg Harbeth_Monitor_40.1_Part of Crossover.JPG (76.8 KB, 70 views)
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Old 18th November 2012, 01:30 PM   #64
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Excellent!!

Sounds good to me

And btw...I like removable panels!!!
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Old 22nd November 2012, 09:58 PM   #65
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Update...

So far so good...might not need the extra caps Steve!!

Hey...have you heard any Visaton drivers??
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Old 22nd November 2012, 10:09 PM   #66
tinitus is offline tinitus  Europe
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Quote:
Originally Posted by system7 View Post
Otherwise, it is questionable if you need to spend huge amounts on crossover components.
no, you don't
its not about money
but absolute certain that even if built from the same materials, and of exact equal value, different inductors will sound different
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Old 24th May 2013, 03:56 AM   #67
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Update:

A couple of weeks ago I added the caps as shown in the 2nd version of the xover...put the tweeter back into phase with the woofer...much added improvement!!

Steve...been enjoying this build greatly!!!

Not sure if there is any more tweaks but give yourself a pat on the back...your xover was fab
Attached Images
File Type: jpg IMG_3627.jpg (297.4 KB, 35 views)
File Type: png Morel_Trial_3rdOrder.PNG (10.9 KB, 34 views)
File Type: png Morel_Trial_3rdOrder_FR.PNG (20.7 KB, 34 views)
File Type: png Morel_Trial_3rdOrder_Phase.PNG (19.3 KB, 32 views)
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Old 24th May 2013, 07:43 PM   #68
system7 is offline system7  United Kingdom
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Thankyou, sideways (Dave)...

It wasn't rocket science.

Lynn Olson is my guide:

Quote:
When working with rigid-cone drivers, there are some hard choices to make: if you lower the crossover frequency to minimize driver coloration, tweeter IM distortion skyrockets, resulting in raspy, distorted high frequencies at mid-to-high listening levels.

If you raise the crossover frequency to improve the sound of the tweeter, the rigid-driver breakup creeps in, resulting in a forward, aggressive sound at moderate listening levels, and complete breakup at high levels. (Unlike paper cones, Kevlar, metal, and carbon fibers do not go into gradual breakup.)

With the drivers we have today, the best all-around compromise is a 2nd, 3rd, or 4th-order (12-24dB/Oct.) crossover with an additional NOTCH filter tuned to remove the most significant HF resonance of the midbass driver.
It MIGHT be worth trying a 7kHz tank/notch on the Morel HU_621 6" bass driver to straighten out the phase. After that, I'm out of ideas. THIS IS AS GOOD AS IT GETS. That is, until NFL kicks off again.
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File Type: png Sideways_Tank_7kHz.PNG (8.4 KB, 12 views)
File Type: jpg Morel_HU621.jpg (69.6 KB, 12 views)
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Old 24th May 2013, 08:09 PM   #69
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sideways; just my .02 cents but System7 helped me with my 2-way and after my failed attempts and various changes and way too much over-thought, everything came out very well. You made a nice choice with the Morel, best of luck
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Old 25th May 2013, 01:44 PM   #70
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Thanks guys!!

Steve...gonna try that notch...should have the components at work

Next stop...I wanna toss in a Morel CAT298 for giggles...total Morel 2 way!! Any workings for that?? I don't think I can directly throw one in this existing xover can I??
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