You can download the user manual here:
http://www.sennheiser.co.uk/sennheiser/products.nsf/resources/545E81B7ABD6 E6A2C12574330042FAEE/$File/HD650.pdf
Manuals for most Sennheiser products are available to download and there is an archive section for older products too at:
http://www.sennheiser.com/sennheiser/home_en.nsf/root/service_download
Neither of which actually provides a FR graph. Am I really asking for something that is out of the ordinary? Has anyone seen an accurate FR for these headphones?
Thoughts/comments welcome
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