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Old 30th June 2007, 03:26 PM   #1
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Join Date: Jun 2007
Question Seas H1224 and usher 9950-20

I am a new member here. I write from Poland , and I want to apologise for my English
I want to ask if anyone tried to built loudspeaker like in title. Previously I wanted to built something with: 8935a and 9950-20, but i heard opinions that it wouldn't be uch good at low frequencies. As in know h1224 is much better. The only problem is crossover. I found something like i attachment.
What do you think about my project? These two drivers are from different hm... "families" and i wonder if it is good to mix them.
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File Type: gif seasl18rnx_scanspeak9500_filter3.gif (4.5 KB, 836 views)
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Old 1st July 2007, 12:05 AM   #2
thadman is offline thadman  United States
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Join Date: Dec 2005
Location: west lafayette
I'm not familiar with the Usher 8935a, are you sure you have the correct part number? If you're referring to the 8945A or 8945P, they are indeed very very good midranges (tested by Zaph to have exorbitantly low non-linear distortion, comparable to Scan-Speak Revelator) as well as woofers and have a good deal of xmax (10mm 1-way I believe)
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Old 1st July 2007, 01:01 AM   #3
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Location: Perth, WA
The 8935A doesn't seem to be readily available to DIYers, but it IS a listed product at Usher's website, as well as used in their own commercial V-series speakers.
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Old 1st July 2007, 01:41 AM   #4
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Join Date: Dec 2001
Location: Melbourne, Australia
John "Zaph" Krutke has a similar project detailed on his website. It utilises the same H1224 midwoofer but the tweeter in John's project is a Seas 27TBFCG.

Here's a link.
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Old 1st July 2007, 01:09 PM   #5
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In Poland it is avaiable:
It costs about 80$
I'm searching a good tweeter for h1224. I looked at many pages with this speaker. It is almost always mixed with another seas tweeters.
I attached project with ss9500 with is very dood tweeter - much better than seas prestige products - I think. Usher 9950-20 is almost copy of ss9500 and costs half a price of scan.

I wonder if someone could simulate crossover for h1224 and usher 9950-20. Do you think that it could be a good idea? Just better than seas tweeters..
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Old 2nd July 2007, 08:17 AM   #6
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Somebody has to know how to do it...
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Old 2nd July 2007, 09:48 AM   #7
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Location: Perth, WA
I'm not sure the 9950-20 is better than the 27TBFCG.

To be honest, the 27TBFC/G has top-tier linear distortion AND non-linear distortion characteristics.

Second, simulating is crossover is one thing, but loudspeaker design is an iterative process that requires meaurements, simulating, building, listening, over and over again. It takes weeks, months if not years to "finalise" a crossover. And a loudspeaker is only good as the crossover, IMHO.

If you're working with the L18RNX/P, Zaph's SEAS All Metal System is a winner IMHO.
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Old 22nd September 2007, 04:14 PM   #8
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But that Seas tweeter has specific "metallic sound". I'd rather choose something softer. I've heard very good opinions about 9950. It's a clone of SS9500 and I think it is the best recomendation.

Maybe usher 9950 is not popular. If someone could help me to compare some 2 projects with two tweeter options: ss9500 and usher 9950, I would be very grateful. We could transfer ewentual diferences to the crossover from my first post.
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Old 22nd September 2007, 05:19 PM   #9
peter_m is offline peter_m  Canada
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Join Date: May 2007
Originally posted by Mor den Siur
But that Seas tweeter has specific "metallic sound".
I was also worried bout that since I am a little more sensitive to high frequencies then most people. I've asked around and exchanged private messages with people who built the Zaph L18 and they assure me it silky smooth. Zaph even gives you options in his design to tone down the higher frequency.

Unfortunately I can't speak from personal experience as I decided to not build the L18 for now and wait for Zaph's new and hopefully soon to be published ER18 design. I don't know which will be better ER18 or L18 design but I'm sure Zaph will make some comparisons and comment about it.

Question: Did you listen to the Seas 27TBFC/G (H1212) and find it too metallic?


PS: according to Zaph's tests the Usher 8945 (A or P) is probably better then the Seas L18 (H1224)
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Old 22nd September 2007, 05:46 PM   #10
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Perhaps... but in Poland it cost's ~150$.
Thanks for your advise.

I'm still looking for crossover for L18 and 9950. One of the great polish writers Adam Mickiewicz said: first think about about your targets - not possibilities ( in free translation)
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