*Originally posted this in the "Grado Mods" thread, but realized this might be a more appropriate home...*
Spent the weekend with my pair of Nakamichi SP 7 drivers...when I first liberated them a month ago, I put them straight into a pair of open Grado cups, and they sounded off. Good, but off. the soundstage was very narrow.
On Sunday I looked at them stock, and realized they are an almost closed design usually, so I made what are essentially large buttons from Black Limba that I put on the grills. They come up and extend over the lip of the cup, making the venting a very thin (1 mm) gap.
Performance improved a lot. I then switched to TTVJ flat pads and they sound pretty damn good.
I think there was an assumption/educated guess that this driver was the one Joseph Grado used in the HP series. If he did, it can't have been this one untweaked/retuned. It has great potential, and sounds very good in a semi-vented cup, but in a pair of open cups they definitely aren't as at home as they should be. He must have used a variant or done some tweaking/tuning himself before using them. @devouringone3 I would do terrible things to find out just what he did.... I guess we'll never know.
Regardless, I really like how they sound in the appropriate enclosure.
Edited by fleasbaby - 11/16/16 at 7:11am