The true bass button is part of the amp, if youāre plugging another amp into the Zen Dac through RCA in the back then it bypasses the amp so the buttons just donāt do anything. But the volume knob can still work so you have to put flip the switch in the back to fixed so that only your amp controls the volume.
Thatās a real shame, at least the knob can work. I guess if the button is really good/addictive or the headphones really need it you can always run the Zen DAC solo.
Welcome, and nice work!
These look amazing! Really considering doing something similar 
Should I spend the extra for the balanced cable?
What are you running them from?
HD58X and Iām planning to go with Magni Modi stack
Then you do not want or need a balanced cable.
Thank you for the information. Iām curious as for the difference between balanced and unbalanced cables and why is it not needed. I really appreciate if you can further forward explaining to me.
There is no need for a balanced cable, because the Magni/Modi are single ended only DAC/Amp. You wouldnāt be able to take advantage of the cable designed to be used on a balanced amp, and would end up needing an adapter to use it at all.
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HD58x just for $129 NOW
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Here is a you tube video that I stumble across on.
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58x on Crack, liquid plat and the lake people RS-08 with the ARES II are great pairings. Gives the 58x more body, clarity, smoothness and thatās where iāve found where the 58x become so so good as it scales up.
Using the 58x with the BTR5 is a passably enjoyable experience but throw it on some better gear and these have surpassed their value for me.
Iāve passed on these headphones for so many years and im so glad I have them when I have the ability to throw them on my current setups.
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About to purchase the HD58x as well, may I ask do I need a balanced cable when I have a micca origen 2 preamp? Thanks in advance
Welcome to HFGF 
as far as Iām aware the Origen 2 is se only so you wonāt want or need a balanced cable 
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I have been basically daily using my HD58X for around 3 years now, for TV and movies. Still a great headphone and the pads have held up extremely well. No creaks, nothing has come loose. Excellent choice for extended listening and huge number of hours use over long term.
A few months ago sound in the left side stopped working. Easily tracked to the stock cable. Which was a good opportunity to replace it as I always found the stock cable a bit heavy and inflexible. Also slightly too long for my situation.
Went with this one from Amazon (Iām in Australia) and chose the 1.3m length.
https://www.amazon.com.au/NewFantasia-Replacement-Compatible-Sennheiser-Headphones/dp/B07Q9J87VL/ref=sr_1_6?dchild=1&sr=8-6
Couldnāt be happier with it. Light, flexible, length perfect for me. And I like the red post split section as it breaks up the all black headphone. The splitter itself is slim and never gets caught on anything. For a cheap cable, I highly recommend it for anyone needing a new one.
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I am using a balanced cable on my 58x and to be honest I canāt tell much of a difference up against the stock SE cable.
I even had a few friends test it out and there is barely any difference, so I personally wouldnāt worry about it. More of something nice to have or do further down the line.
Does this mod still retain the āspaciousnessā effect of what removing the big piece of foam does to the audio because I want the best of both worlds. Which is having a dust filter and makes it sound more spacious at the same time.