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Multi-Way Conventional loudspeakers with crossovers

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Old 23rd November 2006, 09:50 PM   #431
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fwiw -- here's a sim of the stock xo -- and i get the same results when i do the analysis on the workbench -- L4/RL2 are the electrical parameters of the tweeter, L5/RL1 those of the 2 woofers.

the "effective" baffle width of the beveled design is about 16 inches.

Click the image to open in full size.
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Old 23rd November 2006, 10:00 PM   #432
AuroraB is offline AuroraB  Norway
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I would draw the two wooferrs as two separate 6ohm / 400 uH arms, as the R of each coil will influence the parallelling....
Otherwise, the bass response sim is not unusual at all...
Try with an RC impedance correction across the woof's.
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Old 24th November 2006, 06:32 AM   #433
sidiy is offline sidiy  Canada
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Hi,
First my compliments go to all contributors in this very interesting (and ultimately very constructive) thread.

In the AxP article the designer points out the importance of using the specified gage for L3. I can confirm that he is right about that. Here's a sim of the xover: the green trace shows the high pass section with 0 dc resistance for L3 (same as in jackinnj schematic); the red trace includes a 0.35ohm resistor in series with L3. Not much... but audible. There is 1dB difference between the two traces over a good part of the xover region. I'm not very familiar with loudspeaker design so I can't tell into what spl an 'electrical' dB translates to. In my case L3 has 0.2ohm and I added a 0.15ohm resistor (in an effort to tame some brightness)... mission accomplished.
For those who'd like to try it please pay attention to what maximal value you choose. Too high and some low frequencies may enter the tweeter.

Anyone tried something similar?

cheers
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Old 30th November 2006, 01:19 AM   #434
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Quote:
Originally posted by PB2
I'd be curious to see the reverse null FR response.
Pete B.
By reverse null you mean to say that the polarity of the tweeter is inverted?
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Old 23rd December 2006, 07:39 PM   #435
PB2 is offline PB2  United States
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Quote:
Originally posted by jackinnj


By reverse null you mean to say that the polarity of the tweeter is inverted?

Sorry didn't see your reply, yes exactly, measured on axis. It's been a while since I looked at the design but I believe that it is an in-phase design as it should be with LR-2 or 4 designs and therefore the reverse wiring should produce a deep null.

I see that your using a SPICE type of simulation to obtain the crossover response, it would be better to use a simulator designed for speaker design. I use CALSOD which is now rather dated, but does work well. These programs simplify the impedance model of the drivers and provide for simulation of the acoustic response of the driver.

Pete B.
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Old 23rd December 2006, 08:08 PM   #436
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Quote:
Originally posted by PB2

I see that your using a SPICE type of simulation to obtain the crossover response, it would be better to use a simulator designed for speaker design.
Yeah, the SPICE will get you going... but a simulator/optimization program is really needed.
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Old 23rd December 2006, 09:34 PM   #437
PB2 is offline PB2  United States
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Quote:
Originally posted by jackinnj


Yeah, the SPICE will get you going... but a simulator/optimization program is really needed.

It is unfortunate that Madisound is not maintaining their archives, as we had a good discussion about the Thor crossover. I had linked it in this post some time ago, but the link is dead now:
Consultations, improvements - Thor

I also mentioned it here:
http://www.diyaudio.com/forums/showt...684#post879684

and here:
http://www.diyaudio.com/forums/showt...583#post883583

Pete B.
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Old 23rd December 2006, 10:39 PM   #438
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Quote:
Originally posted by PB2
It is unfortunate that Madisound is not maintaining their archives, as we had a good discussion about the Thor crossover.

There aren't enough hours in the day.

I've been talking to myself of late -- http://www.diyaudio.com/forums/showt...94#post1088394

the Heybrooks have been sitting in a guest bedroom for about 8 years without benefit of music -- i purchased them circa 1986 -- decided to see what they looked like inside -- more foam rubber than a Hollywood starlet -- talk about overdamping!.
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Old 24th December 2006, 09:41 AM   #439
AAR is offline AAR  United States
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Default Fat Thor

So as one of those that has the original Madisound cabinet Thor, standard xover, I've perused this thread with some degree of sadness lamenting the apparent arbitrary box shrinking of the original design--and not having the space nor tools to engage in a box rebuild--I was wondering if anybody has contemplated constructing fat Thor boxes for those of us determined to get the best out of their upscale drivers yet lack the wherewithal to do it themselves.

Give me a price?

Thanks!
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Old 1st February 2007, 09:08 PM   #440
Renron is offline Renron  United States
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Default Fat Thor modifications?

What a wonderful thread this has been Thanks to those who have devoted much time and energy to this build. (Fat Thor)
Being as this is my first speaker build, I have a few questions.

If the box is built and then a solid cherry wood front baffle is added (speakers flushed in face of cherry) would this effect the acoustical dynamics?
If I wished to exit the port in front (Speakers will be close to rear wall in living room) how would / could I build this?
I was advised by a local speaker designer that I should opt to add a lower compartment to fill with lead shot or sand to make it heavier. Is this really needed?
Last question....for now , Has anyone in the Sacramento San Francisco built the Fat Thors? Perhaps I could listen to them???
Worth a cold beer or two for someone....
Thank you for the superb community and education provided.

Ron
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