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Help w/ Totem Model 1 homage
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Old 23rd May 2020, 03:41 PM   #1
Ryan200 is offline Ryan200  United States
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Default Help w/ Totem Model 1 homage

I'm going to build a Totem Model 1 clone and I wonder if anyone has a diagram of the crossover.

I got the drivers pretty cheaply. Dynaudio 15W75-4 and Seas 25 TA/WGB-TO. Does anyone have the T/S for these drivers? I haven't had any luck searching online.

I'm new to crossover design so I'm going to design my own then compare to the original design. Any help appreciated.
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Old 23rd May 2020, 04:15 PM   #2
vinylkid58 is offline vinylkid58  Canada
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Quote:
Originally Posted by Ryan200 View Post
Does anyone have the T/S for these drivers? I haven't had any luck searching online.
See post #6 Has anyone built a Totem Model 1 Clone?
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Old 23rd May 2020, 04:20 PM   #3
Ryan200 is offline Ryan200  United States
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Awesome! I didn't see that thumbnail when I searched before b/c I wasn't logged in.
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Old 23rd May 2020, 04:39 PM   #4
martyh is offline martyh  United States
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The tweeters were modified by adding a back chamber at totem. There is some info on what is required somewhere on the internet but I can't remember where. I would be interested to see what they they did with the woofer in the crossover. According to Troels there are some resonances that need to be dealt with.
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Old 23rd May 2020, 04:58 PM   #5
system7 is offline system7  United Kingdom
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I haven't got a lot of stuff on that woofer:

Click the image to open in full size.

The bass filter is usually about 1mH coil and 4.7R plus 10-15uF impedance correction, relying mostly on natural rolloff. About 7-10L reflex you'd think. Dynaudio used to do quite complicated tweeter filters, but not set in stone IMO. Probably a third order would work well enough.

The tweeter is standardish 1" SEAS metal stuff. Shouldn't be too hard to knock up a 3kHz crossover. I'd set up a sim to see how it looks:
Software | Visaton

The Visaton SC10N is not hugely different from SEAS 1" tweeters. The W130S-4 might give you an idea too. After that you just wing it a bit.

SEAS 5INCH
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Last edited by system7; 23rd May 2020 at 05:13 PM.
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Old 23rd May 2020, 06:00 PM   #6
Ryan200 is offline Ryan200  United States
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You're right on System7. Stereophile lists the volume as 7.2L.

Totem Acoustic Model 1 loudspeaker Specifications | Stereophile.com

The tuning appears to be 42Hz. I'll start dickering with Visaton and see what happens.



As far as a tweeter chamber goes- I didn't even notice the vented pole piece until I read your post martyh. Guess I have some googling to do.
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Old 23rd May 2020, 06:08 PM   #7
system7 is offline system7  United Kingdom
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I wouldn't losee too much sleep over a little back chamber on the tweeter, Just controls the Fs resonance a bit better. SEAS do it as standard these days:
H1147-06 27TBC/G

Your crossover will look a bit like this:

Click the image to open in full size.

But different bass filter, drivers and positive polarity on tweeter. Shouldn't be hard to modify the default project in boxsim to see how it works.
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Old 23rd May 2020, 06:18 PM   #8
Ryan200 is offline Ryan200  United States
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That's very helpful.
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Old 23rd May 2020, 11:06 PM   #9
Ryan200 is offline Ryan200  United States
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Does this look right? How do I reduce the hump at 1400Hz?
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File Type: png speaker.png (356.4 KB, 42 views)
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Old Yesterday, 07:36 AM   #10
system7 is offline system7  United Kingdom
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Crossovers aren't hard. You just get the two drivers playing nicely together!

Click the image to open in full size.

Troels Gravesen has done half the work here for you:

Click the image to open in full size.

SEAS-3-Way-Classic

That's a reasonable 3.5kHz SEAS tweeter slope. It's going to sound good. Now you've just got to get the midbass to do the right things to join up.

The W130S-4 is a bit different from the 15W75-4, so stick to 1mH series followed by our guess of 4.7R and 15uF shunt for the bass. Dynaudio have done the work there already! No need to reinvent the bass filter.

The 1.4kHz lump in the W130S-4 is just what it does. We are only guessing here. Getting a feel for it all, you see. What I am hoping is if you get the tweeter to cross at about 3kHz for 6dB down, it should join up with the Dynaudio midbass.

Really, most 5" plus 1" speakers look the same.
Peerless HDS PPB 830860

You just fiddle with the details for particular drivers. Possibly R1011 and C1031 are the only two tweeter components that then need a little tweak.
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Last edited by system7; Yesterday at 07:50 AM.
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