I assure you that it only changes the size of the resonating chamber "magnum" but the drive is still the same. if you go on my Facebook page you can see a completely dismantled PS1000!

hello, I dismount to elaborate all Grado (Spirit Labs) and the drive of the PS1000 / GS1000 or RS60 are the same !!! only changes the drilling of the rear paper.

contact me on facebook or etsy spirit labs headphones

$ 56 one time for it to arrive in the United States, then it getting through you. Use drive series "e" with three holes. Trovate la sperimentazione su Facebook spirit labs headphones

Shipment to United States costs 50 € Twin Pulse I then every beta tester will send out to the next.

I do it in Italy with forum gazebo Audiofilo. if you like I can extend the tour for you,

You know the Twin Pulse project with double-drive Grado?

if the paper is cut to leave two holes open it is a series "e"

if you like the Grado sound simply the best is Spirit Labs headphones!

Audio-gd nfb 28 balanced mode: low rock. light amplification: Low long and chewy

warning! Grado headphone is not easy to fly well. Drive Grado ask a lot of current amplification

zf foam is not completely impermeable to air. zf foam allows you to put in the compression chamber in which is located the ear. G original PAD using a piece of totally permeable foam air not allowing the driver to put into the compression chamber.

find the reviews on the Italian forum Il gazebo audiofilo

G PAD zf foam single-material, semi open cell Drive Grado serie E 3 holes open.

Dynamat treatment and the holes are essential for optimal results. Spirit Labs provides a band very real comfort in padded leather to make comfortable headset

I'm used to hifiman 500 stand them easily

Cup aluminium 118gr, ring brass 55gr No Steel

my Grado prepared by the Spirit Labs