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Multi-Way Conventional loudspeakers with crossovers

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Old 30th October 2012, 10:08 PM   #31
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Ditto...

But to those others...have you ever listened to a Morel driver?? Implemented a Morel driver??

Don't knock it till you try it LOL!!

Anyhoo...back to the task at hand...did what you said Steve...sorta...put a 3.3ohm resistor inline with a 4.7uF cap on the positive side of the tweeter and wired it up in phase...the woofer I left on its own with nothing...results??

Actually quite stunning!! I won't say perfect but a heck of alot better than I would ever have imagined!!

Bass needs a bit of boost which I did with my tone controls on my Mac...otherwise it could be a bit tighter...as it stands, it's nice, warm, full...almost there!!

The Visaton...what can I say...fantastic tweeter...so rich and smooth and I really did nothing LOL!!! Not sure if there is anything else I need to do...will listen for a couple of days to get the hang of these things...more material has to be played

It might be a tad hot in that 3k region...probably the suspect region where the 2 drivers meet...the reason I say that is piano is a tad bit hard rather than organic...less fluid...

I can't say enough good things about that ceramic tweeter...worked extremely well with the DEQX and now on it's own, it's almost magical!!

Toodles for now!!!

Last edited by sideways; 30th October 2012 at 10:35 PM.
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Old 31st October 2012, 02:03 AM   #32
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k...just ordered the parts for your test xover Steve

If a simple cap\resistor showed some promise this'll be worth it!!

I'll keep you posted!!

Thanks!!!
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Old 31st October 2012, 02:15 AM   #33
just another
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I've taken the discussion of morel and zaph with sreten off line, but just wanted to make clear I don't have a problem with zaph's measurements as a whole and in no way was implying that they shouldn't be trusted. There was only a single measurement which I had done that disagreed with his and the discussion between him and myself on that can be seen here --> Morel MW144 deceitful specs

I can see that my grain of salt comment could be construed as being aimed at all measurements he does but it was more meant to mean that there is nothing that should be beyond questioning (importance of distortion included) and is more applicable to those speakers for which he doesn't have a unit to unit consistency rating (because his sample size was two or one drivers only).

Tony.
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Old 31st October 2012, 02:35 AM   #34
system7 is offline system7  United Kingdom
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Yes, it's very boring and disruptive to turn a build thread into a discussion of whether you "approve" of a particular driver or such. The thing is to do the best you can with them since they are already purchased.

A metal tweeter tends to sound metallic. That's just what it does. A question of its harmonic nature. You do notice it on classical piano particularly.

I was wondering if we can get that tweeter filter behaving more suitably and rolling off more steeply to avoid overlap with the bass. It can be done with a third order filter which I found in my archive. I enclose an example for future tweaking experiments. That scheme should match your Morel quite nicely, with some small tweeter diffraction effects not included here as it goes. Haven't modelled it for your particular tweeter, but that would be your starting point.
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File Type: jpg Morel_Twin_CAW638.JPG (82.6 KB, 63 views)
File Type: jpg Morel_Twin_CAW638_XO.JPG (24.8 KB, 62 views)
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Well, there it is! Best regards from Steve in Portsmouth, UK.
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Old 31st October 2012, 11:10 AM   #35
Dissi is online now Dissi  Switzerland
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Hi sideways,

I could make a proposal for the crossover, but I need to know all cabinet dimensions and the driver positions on the baffle. A picture of the box would also help.
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Old 31st October 2012, 11:54 AM   #36
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Hey there

K...internal box size...8.5"x9"x13"...internal volume ~15L...front ported tuned to Fs of the Morel...tweeters are offset like a ProAC with the port just off to the side of them and lower towards the centered Morel driver...

I would like the simpliest xover as to keep coherency between the drivers as best as possible...this tweeter tends to be so lovely and rich...very nice on vocals and jazz that I would not want it to be surpressed..or at least that much seeing a simple series RC tends to give it a slight boost in the 3-5K range making vocals a little too pronounced for my ears...too much energy coming out

Cheers!!
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Old 31st October 2012, 12:58 PM   #37
Dissi is online now Dissi  Switzerland
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I propose a classic 2nd order crossover at 2.2 kHz.

SimulationSideways.jpg

CrossoverSideways.jpg
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Old 31st October 2012, 09:17 PM   #38
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Thanks for this!!

Looks similar to the one Steve put out...

I have the parts ordered for that one already...see how it goes...can always tweak up to yours!!
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Old 31st October 2012, 09:38 PM   #39
tinitus is offline tinitus  Europe
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Quote:
Originally Posted by system7 View Post
sideways, reference your query on good test values to try on the crossover, I include a sim.
you forgot a zobel for the inductor
Dissi have the zobel
but I would use bigger resistor
never less than driver dc
and the same goes for all my paralel inductors

on Dissi's xo, if you mount the 1R8 att resistors on either side of the inductor, after the series cap, maybe you could get away with slightly smaller cap, but only 'maybe'
it can be quite effective to fine adjust with those resistors
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Old 31st October 2012, 10:07 PM   #40
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Isn't a zobel to tame a rising response for the tweeter??
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