Yes, I'm very glad I changed my mind and took my 500s out of the trash and installed the HE-400i band.

I've put a lot of time on the new 400i headband and I absolutely love the upgrade. The band is much more comfortable but the real bonus is the extra clamping force which gives me much more refined low bass. This is a fantastic upgrade.

I received my Gungnir back from Schiit today for the multibit upgrade. I already had the Gen 5 USB. I had to wait about two weeks in the upgrade que and Schiit received it on 14 February and I received it 2 March. Total with tax and shipping for the multibit upgrade was $580. It's paired with a...

Schiit's turnaround time for the Gungnir Multibit upgrade has been slow. I had to wait about 2 weeks in the que to ship my unit. They received it 14 Feb and I was notified today (24 Feb) that they are ready to ship it out.

I'm wondering how common is it for the HE-500 headband to break? I ask because I used one hand to remove my HE-500s a couple of weeks ago and the round plastic clamp that holds the earcup slider broke in half. It's not like I pulled really hard or did anything strange when removing the...

The Gungnir multi-bit upgrade is pretty popular. I'm currently # 3 of 37 in the que for upgrade. I did the Gen 5 USB upgrade last year so I'm not doing the Unison USB.

The little amp is still going strong and all my balanced headphones run fine with it.

I just upgraded from a Mjolnir 1 to a 2 because I'm a tube guy. I design, build and repair guitar tube amplifiers and I love tube audio. I fired up the MJ2 last night and was disappointed. It seemed I lost some clarity compared to the the solid state MJ1. I let it burn in overnight but the tone...

I bought an early model Gungnir a few years ago and I've always had to use the S/PDIF input because the USB was flakey. Sometimes the USB would work and then it would just disappear and my Win 10 computer wouldn't recognize it. For the last year or so I got a "unrecognized device" error when...

The 180 and 330 ohm resistors form a voltage divider to cut the output signal voltage by 35% or 17dB. The load impedance the amp sees is also affected by the resistors. With 32 ohm headphones the load would be 209 ohms so way above the typical 4 to 16 ohm speaker load but solid state amps are ok...

Mightygrey, that sounds correct.

Reel-to-reel will offer much better fidelity and signal-to-noise ratio compared to cassette and they look much cooler too.

25dB of attenuation is a good place to start. Your resistor values look good. Here's the basic attenuator layout:

I have HE-500 and Senn HD 6XX cans but my modified and balanced Fostex T50RPs sound best to me when driven by speaker amps. As Guido mentioned, the biggest difference is the solid, hard hitting bass response.

The box has a bypass switch that makes a direct connection. I can run direct or with attenuation. There's also a switch to allow balanced and unbalanced headphones to run on balanced and unbalanced amp outputs. Typically solid state amps run headphones fine with a direct connection but tube...

It's my design: https://robrobinette.com/RobinetteBox.htm

I got a chance to listen to the Marantz 4400 Quad and Sansui G-8000 with the T50RP headphones connected to the speaker outs and the headphone jack. They both sound great but I'd have to give the nod to the Pioneer SX-1080 as the best with the headphones, the Sansui next and the Marantz a close...

I'll follow up when I try the Marantz and Sansui amps. I absolutely love the G-8000 with JBL and Klipsch speakers.

I recently picked up a Pioneer SX-1080 from my local Craigslist and on a whim tried it with my modified and balanced Fostex T50RP and Sennheiser HD6XX headphones and I'm really impressed with the tone. I actually prefer the Fostex over the Senns. I liked it so much I was going to create a new...

If you're not an electrical engineer and are curious about how tube amplifiers work I have a webpage dedicated to explaining them in the most non-technical method possible. The page uses guitar amplifiers but the theory is pretty much the same. If you are interested please take a look and I...

Wow. The HD6XX is amazing. My music, especially high volume rock-and-roll, sounds better with these headphones than anything I have ever listened to. They just sound so right compared to my modified T50RP and HE-500 that they must match my sonic preference to a T. The Massdrop purchase of the...

Your first link is to a 3 pin connector so it won't work but the second link should work.

Chris, Guido was asking if the ground lift switch affected how he would interface his headphones to his amp and in this context "The ground lift switch doesn't have anything to do with the speaker common ground" is a plain and understandable answer. Yes, we all know the ground lift switch...

Simply measure for continuity between the amp's black negative terminals (with the amp unplugged). If you get a continuity beep from your multimeter you have a common ground (single ended output).

The ground lift switch doesn't have anything to do with the speaker common ground.