Joe Grado HP1000 Frequency Response (Anax's pair). Still a reference for neutrality, even today.
Just dug these ancients out after ages in storage. The stock pads have -- as typical for Grado, beyer, Senn, etc -- disintegrated (= crumbled &/or gummed up).
Haven't been thru all the HP-x mods posts yet. So ...
+++ What's the best pad option for the HP-1 ... e.g., newer Grado stock, 3rd-party (after-mkt), DIY, etc.?
+++ The MEASURED curve -- ala IEC dummy head and whatever electronics, xducers and software -- MAY be v. smooth, but who knows whether most HUMAN ear-brain systems function optimally THAT way?? ... if ear-brain could speak its mind (LOL), might it shout, "diffuse-field-eq me!"?
+++ On SQ, notice that dynamics such as snare drum are snappy quick (typical Grado) but slightly compressed (not as impactful) ... even with good amping. Not sure there is a tweak for this.