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105/3 woofer replacement - SP1256 to SP1188 ?

 
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Hagedorn
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Joined: 07 May 2014
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Location: Denmark

PostPosted: Mon May 12, 2014 10:53 am    Post subject: 105/3 woofer replacement - SP1256 to SP1188 ? Reply with quote

Question is

Can the B200 - SP1256's of the 105/3 be replaced with the B200 - SP1188 from the 104/2 ?

At least this has been done in my 105/3's by the privious owner, but do they have the same specs and do they match the system crossover - impedance etc. ?

I do feel they are a bit low on bass compared to the memory of my first 105/3's which i had from new.. Wink
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audiolabtower
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PostPosted: Mon May 12, 2014 1:57 pm    Post subject: Reply with quote

Sorry, don't know exact answer but the 1256 was also used in the production 104/2 when they changed to bi-wire terminals.

They also changed the SP number of the 104/2. This could either mean a significant change to crossover or just the fact the bi-wire was added. If you could find the crossover schematics of both 104/2s system SP3037 and SP3128 and if the values in the bass crossover are similar, then it's perhaps a good chance the drive unit parameters were similar enough to be interchangeable? If the crossover values are much changed, then maybe not such a good sign since the box parameters remained the same?
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proffski
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PostPosted: Mon May 12, 2014 4:30 pm    Post subject: Reply with quote

I have the full schematic somewhere, cannot access till the weekend.
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tlmadsen
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PostPosted: Thu Oct 26, 2017 8:45 pm    Post subject: Reply with quote

Hi Proffski
Did you ever find the schematic ?. It would be quite good to know if SP1188 is basically the same as SP1256
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proffski
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PostPosted: Thu Oct 26, 2017 8:55 pm    Post subject: Reply with quote

tlmadsen wrote:
Hi Proffski
Did you ever find the schematic ?. It would be quite good to know if SP1188 is basically the same as SP1256


Yes, then mislaid again. I saw them a month ago and may even have the scans.
The original is about a metre square sheet! Apologies for the delay. I'll post here once found.
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