đŸ”¶ Fostex T50rp

How are using “dynamic”? Does that refer to the sound/music definition of difference between loud and quiet? Or is it that T50’s are planars that sound like dynamic driver headphones?

The ‘dynamics’ of the sound - in this case meaning difference between loud and quiet - aren’t the problem I noticed when the Blues are underpowered. When I was experimenting with them, powering them with a Fiio K3 - good sounding little amp, but not a powerful one - the biggest issue was the sound was muddy and sloppy, particularly in the bass and mid-bass, and lacking in instrument separation. The Atom got significantly more out them, but the Magni gave them their clearest, ‘easiest’ sound. The Atom definitely improved the overall sound, decreasing the muddy/sloppiness and increasing instrument separation, but still maintaining some of those sonic flaws when compared to the Magni.

I asked the question about your meaning of “dynamic” because my hypothesis is that the power-hungriness comes from the fact that their small-ish planar drivers end up adopting some impedance properties similar to that of dynamic drivers. Namely, in comparison with larger planars their impedance is much less even across the frequency range, causing them to behave more like how a dynamic driver’s impedance changes with frequency. Adding more amplifier power means adding more current which means more force to control the driver. Once the driver is more controlled, the sound is cleaner.

And maybe that’s a bunch more than 20 characters saying the same thing you just did? But I agree with your assessment that they are good sounding cans - once you get them properly powered.

1 Like

Oh, I see! I thought the only thing that would differ was the “difference between loud and quiet”, yes. Interesting


A good amp can offer better speed and control, and therefore enhance other aspects. It can also even out the frequency response by providing adequate power to all ranges.

Sorry, I was talking about the difference between the Magni and the Atom. :slight_smile:

I know amps add way more than, well, volume.

Annnd JDS Labs Atom ordered and shipped. Finally ordered it today. :+1:

No, I don’t want the 50 watt emotiva. :stuck_out_tongue:
(I wanted something small and simple).

1 Like

Well holy shit, here’s the cheapest way to get rid of the 4-to-8khz plateau.

1st: Do this.
2nd: Shure 840 pads.

Seriously. That’s it, that’s all. No need to mess with toilet paper or whatever.

So, you get better sub-bass with this
 “mod” (I don’t even think I dare to call this a mod
 but huh, that’s a modification). Which adds much-needed warmth to this
 Japanese mech / cold precision machine.
You also get to hear the mids, finally. Because the plateau isn’t there anymore, stealing the show.
You still get clarity with this modification, I mean hell, dare I say twice the detail?! Because you finally hear the mids, and the plateau is not entirely gone, there’s still a 9-10khz peak.
And I swear just doing this stupid thing adds soundstage and air to T50RPs.

If you’re more into the 100hz “knock”, which may be what people call planar (kick) slam, you may not want to do this. This makes T50RPs more neutral, harman neutral in the sub-bass region. But some will see this as added muddiness, changing “kicks” into “booms”. But you’ll hear the bassist in Metallica’s Kill em All. :wink:

Anyway, try it, it’s free, and seriously, it’s like having brand new headphones for free. It’s a BIG change!

Edit: This makes these
 “U-shaped”. You get muddy sub-bass (100hz and lower) and sibilance (10khz range peak). So, unless you only listen to music at low volume, don’t do this.

What did u do exactly? I dont have a t50rp so I’m not sure what was changed lol

I literally just took the foam and turned it 45 degrees, “hiding” the four corners of the planar driver. And just this thing got rid of the 4-to-8khz plateau (high frequencies), because T50RPs are far from neutral, even with Shure 840 pads (yes, I said they were studio-ready a few weeks ago in this damn thread. I changed my mind apparently
 perfectionism – I’m also treble-sensitive and got tired of the treble boost
 I thought the JDS Labs Atom would fix all my problems, but it did not).

I’m waiting for someone to tell me it’s the worst idea ever (it’s my first ever mod), and talks about distortion etc
 but my ears could finally enjoy music
 for a few hours. Because this makes these
 “U-shaped”. You get muddy sub-bass (100hz and lower) and sibilance (10khz range peak). So, unless you only listen to music at low volume, don’t do this.

Edit: It’s a 4-to-8khz plateau to my ears
 Sorry. In many graphs it’s a
 huh
 4khz-to-12khz mountain peaking at 10khz.

1 Like

And now
 I cut the foam a bit.

-Hiding, like, 3 millimeters from the top and rear of the driver, gets rid of the 4khz-to-8khz plateau, so they’re more neutral (Harman neutral) now. That’s my goal.
-Cutting the foam at the front also adds “front” soundstage, I think!
-Cutting the foam at the bottom definitely gets rid of the muddiness. Even at dangerous, dangerous volumes. Planar bass/kick slam is back.

(And yeah, I also have HD58Xs. That’s what I used for comparison – I love these.)

This just makes my T50RP perfect for me. :heart:

(Right driver)

That’s all folks! :grinning:

What’s your next planned mod?

Haha! Relax, @M0N :smile:

Like, 24 hours after I bought T50RPs you ask me “what’s your next planar” and now you ask me “what’s your next mod” :sweat_smile:

Currently enjoying “Jazz at the pawnshop” I just bought (flac) with these. I just
 could not enjoy jazz with these before. They sounded way too clear, bright, analytical, precise, mechanical, etc. Now they just sound
 great. More or less, as neutral cough natural-sounding as my HD58Xs, but with a 10khz-ish peak I think (can’t do a frequency response graph, sorry). And now, my T50RPs got greater high-treble extension too (air!).

I’m just speechless. Because of this stupid free and five-second mod I swear I hear twice the detail. And twice the soundstage. From my Denon AVR which is not a clean source. And I can use these in the studio now. 
fucking hell, lol.

1 Like

You know you want to do more lol, well that’s great you are getting it to where you like it even more :+1:

I definitely won’t mod my HD58Xs
 heh.
And my HD280 Pros are a lost cause, zero detail compared to these. Still excellent for monitoring though.

I wasn’t expecting to mod these at all, I just underestimated what the 5dB bump would do to my treble-sensitive ears. I remembered having a crappy bluetooth speaker with black tape on it to quell the highs (lol!), looked at my T50RPs and went “hmm”, and there you go. No tape involved for my Fostex lol.

I just deleted one or two messages (and pictures) because there was too much conflicting infos and too much mistakes were made. Also clarified my mod(s) in the last message (see :arrow_upper_right: what I replied to). What I wrote makes sense now, lol.

2 Likes

Had a pair of t50rp mk3’s for a little while now, and I REALLY like them. They are so different from anything I’ve ever heard. Their soundstage surrounds you and the imaging is the best I’ve ever heard. It does have a big bump in midbass and mids in general, then I feel like it spikes a little in the upper mid-range and then drops off from there. I tried using the Shure 840 pads and the headphones just became a mess. Bass was out of control and bloated, and I didn’t hear any sort of highs or imaging whatsoever. What I ended up doing what taking rolled up toilet paper under the stock pads and it fixed the comfort. It sounds identical with a little more soundstage compared to stock. I have some planned mods for it. I have the Mayflower mod kit coming with the baffle upgrade and I’ve never been more excited to see how it turns out.

I had my T50’s modded to Argons and they’re crazy completely different from stock, big sound stage, amazing low end, incredibly detailed mids and air SO much air in the highs its nutts

1 Like

Stock “pancake” pads = treble murder
Shure 840 pads = planar bass murder
:stuck_out_tongue:

Just put the T50RPs with Shure 840 pads over a yoga block or a DVD rack or something for a few hours to crush em a bit and make em thinner if you want something more neutral-ish.

This is my review after doing just that:

1 Like

Ya I totally agree with treble murder at stock. Honestly everything sounds muderous stock, but once I did the toilet paper mod it helped it out a ton. Still treble(sometimes a little too much) and the sweet mid-range bump is still there too

Hey gents,

Just got hooked on Z-reviews and slowly getting particular with audio
started with set o wharfedales at work nuther at home (with smsl18)
got Xmas shp9500s and just picked up set of dt 770 pro 80 Ohm (replaced old pads and planing removable cable 3.5 mm jack mod) and a Schiit fulla
I’m a DIY lover and have access to printers and a small CNC Mill. Curious if any of you gents have files for the Cup mods 
 Outside Mr. Speakers open source printables. I have little to no background in acoustic shape/knowledge but love to learn as well

If no, a repository of .STL files and DIY catagory might be in order. I volunteer to open one.

Thanks

1 Like