Got the definitive answer from Grado this morning, the 231 on the rim next to the driver (so when you look at the driver straight on the number is visible) IS the serial number, sent them the photos and they confirmed.

The 231appears barely visible in the photos but it's definitely there when viewed in situ, and no serial number on inner rims but black leather on headband? Fascinating stuff 🤔🙂

Now upon further investigations the 231 is next to the drivers on the wood but on the same side as the drivers , there appears to no serial number on the inner rim of the wooden housing, I'm thinking the 231 is the driver matching number? Photos attached.

Hi, interesting thread ! I have recently acquired some RS1 and i know they were quite old and amongst the earlier versions, Buttons on drivers, square metal rods with hard end stops not rubber but black leather headband not the brown version mentioned on very early RS1. I got curious so i...

I know this reply is late to the party but I've acquired some 560 ovation (MK1) and having had the 540 ref and 540 gold plus 580 , 600, 650 and the newer 560s , the 30 plus year old ovation blows them all out of the water,. Closest that comes to my Stax lambdas in overall sound signature, no...

Interesting....that more a sticking plaster job rather than a cure , not sure how many tube amps use a fan though maybe they could market it as a "unique" selling point , this is me I sarcastic mode btw lol

Sent it back for a full refund, thats the beauty about Amazons no quiblle return policy, never had any issues at all with Amazon, its Douk audio who knew about the issues but still decided to sell them

As previous reply said just be glad it works at all! Bought mine off amazon thankfully and worked for about 4 hours then gave up the ghost , not powering up at all. Amazon pulled this off so obviously they were getting returns all the time. Not even sure if you can actually buy a P7 now? One...

I totally agree with everything you said, these headphones ARE my end game no question, i was also very reticent about pulling the trigger on these cans purely based a couple of you tube videos that lets say wasn't very accomodating, then i went on the forums and found people like us who loved...

Thanks again, been listening to these this PM on my Sony 338ESD Cd player, 12.5 kgs of late 80's mastery and its superb, this is listening to the golds only through the headphone socket on the player albeit i think the headphone socket on the Sony is good, but amping these Golds i know will push...

Reporting back now, the serial number on the headband reads 010169 so thats above the 10k but on taking the pads off and checking on the inner outer rim it has FB 600 so iam presunming they are 600 ohm versions, are these more sought after for better sound?

Thanks guys, ill heck out later today and report back, cant believe how good these things sound, they give my stax 507 system a run for their money, all the more amazing for a 40 year old headphone, i have had the 600s and 650s and i do genuinely think they sound better!

Got some golds myself , can anyone tell me how i know if i have the 300 or 600 ohm?....sound amazing btw