sharpi31
New Head-Fier
- Joined
- Oct 1, 2008
- Posts
- 9
- Likes
- 9
Good work, glad I could help mate. Do you notice a difference? Keen for someone to compare a modded NX1S with an NX3....
Yes.I've been playing with this for driving my Fostex TH-X00 purpleheart instead of the Xduoo XD-05. I saw reference to uncoupling the capacitors. Found the explanation here. Sounds completely reversible as long as I just bridge the capacitor legs but don't actually cut them. Am I correct?
I finally got a chance to pull out the soldering iron and bridge the capacitors. Wow, much better low end than before.Yes.
I finally got a chance to pull out the soldering iron and bridge the capacitors. Wow, much better low end than before.
ZS6, thinksound ON2 and rain3, Fostex TH-X00, NuForce Primo 8, Xiaomi Hybrid Pro HD, SoundMAGIC E10 and PL50, Mee Pinnacle PX, Brainwavz B150, Senzer, Marshall Mode, TFZ Exclusive 5 among others. Been trying to find both headphones and IEMs I like and a set of cheap IEMs for portable use.Yes it's quite noticeable. Now we've got a decent amp on the cheap. I'm enjoying my zs5v1 and Dt 990 250 ohm with nx1s goodness. Hope you are doing the same.
Any idea if the NX2S has the same issue and has a similar fix?… I received my NX1s today. Looking at Toppings frequency response graph the bass is >2db down at 20Hz. Sure enough this appears to be largely due to undersized coupling caps between the volume pot and gain stage (1uF into 9.4Khz resulting in a -3db point of 16.9Hz). The good news is that there is no DC bias on the coupling caps, so it should be possible to bypass them (rather than find some way to replace them with larger capacity caps within the small amplifier case). I measured less than 1mV DC offset on the outputs with the caps in place - I'll short out th coupling caps and remeasure, to ensure the level doesn't become problematic.
It's worth addressing this issue (by bypassing the existing caps or replacing with larger ones) as the phase response of the amp is compromised significantly above the -3db frequency. The normal rule of thumb would be to set the coupling caps to have a -3db point of 1/10 the lowest frequency you're aiming to reproduce (so 2Hz if you want clean 20Hz playback).
Update: all works fine with iPad Pro source and bypassed coupling caps. I'm measuring 0.5mV and 0.6mV on the NX1s outputs. Bass definitely bigger and tighter (not over the top, just less softened).
Any idea if the NX2S has the same issue and has a similar fix?
https://www.massdrop.com/buy/smsl-sap-ii-headphone-ampHi all, I'd like to bother you for a bit of advice.
The short story: I'm looking for an amp or DAC or DAC/amp for office use. Budget 40$.
$68 on Amazon or around $60 on eBay. It's a really powerful and clean sounding amp. You could use it with your desktop and then continue using your FiiO A1 with your phone.Thanks, but I'm outside of US. With Massdrop, I'll pay shipping + import fees + customs and in the end I'll end up paying double the price that is listed on the site.