According to Harman there are no sonic differences between Arlon 25N and Nelco N4000-13 SI. However, at least one source shows Nelco as less expensive than Arlon (see 1st link below).
The data also reveals that while Nelco has slightly better dialectric properties than Arlon, Arlon has superior loss characteristics. I'm not an engineer so I won't even speculate as to how these differences potentially relate to performance in a high-end preamp.
http://findarticles.com/p/articles/mi_hb4943/is_12_25/ai_n31346925/pg_3/
http://www.trackwise.co.uk/www/materials-performance.html
You can also find full data sheets for each product here...
http://www.integratedtest.com/products/pcb-fabrication/laminates/index.php
Not sure why the change (I didn't ask), but it would be interesting to know
if any folks out there (including Levinson dealers) have compared the two.
Happy Listening!
The data also reveals that while Nelco has slightly better dialectric properties than Arlon, Arlon has superior loss characteristics. I'm not an engineer so I won't even speculate as to how these differences potentially relate to performance in a high-end preamp.
http://findarticles.com/p/articles/mi_hb4943/is_12_25/ai_n31346925/pg_3/
http://www.trackwise.co.uk/www/materials-performance.html
You can also find full data sheets for each product here...
http://www.integratedtest.com/products/pcb-fabrication/laminates/index.php
Not sure why the change (I didn't ask), but it would be interesting to know
if any folks out there (including Levinson dealers) have compared the two.
Happy Listening!