[kukkurovaca]

That's low impedance. The ES100 (and most amplifiers) will drive it with more than adequate power.

But it's a Q701 I had in mind....

Even if impedance is low, insensitive headphones may be difficult to drive. I haven't used the Q701 but plugging numbers into a calculator, I'd say that you might be pushing the ES100's single-ended capability, particularly if you want headroom to EQ. For comparison, my GT3 Superbass are a little more sensitive (going by specs) than the Q701 and I find them to sound a little thin using the ES100's single-ended output and EQing.

 

[jasonb]

Even if impedance is low, insensitive headphones may be difficult to drive. I haven't used the Q701 but plugging numbers into a calculator, I'd say that you might be pushing the ES100's single-ended capability, particularly if you want headroom to EQ. For comparison, my GT3 Superbass are a little more sensitive (going by specs) than the Q701 and I find them to sound a little thin using the ES100's single-ended output and EQing.

I don't listen very loudly though which is what might make it work for me. A Hidizs Sonata HDII USB-C DAC dongle at half volume gets them loud enough for me and I think they still sound good on it.

.3 volts and 1.42mw is what it takes to get a Q701 to 90db according to inner fidelity, and I definitely listen at less than 90db.

 

[kukkurovaca]

I don't listen very loudly though which is what might make it work for me. A Hidizs Sonata HDII USB-C DAC dongle at half volume gets them loud enough for me and I think they still sound good on it.

.3 volts and 1.42mw is what it takes to get a Q701 to 90db according to inner fidelity, and I definitely listen at less than 90db.

You may well be fine in that case, particularly if you don't need to EQ.

 

[jasonb]

You may well be fine in that case, particularly if you don't need to EQ.

No plan to EQ. I've already done the bass mod on them. If anything I may do a very slight amount of - EQ on the Q701's peaks, but no boosting of anything.

 

[megabigeye]

No plan to EQ. I've already done the bass mod on them. If anything I may do a very slight amount of - EQ on the Q701's peaks, but no boosting of anything.

Found this quote earlier in the thread; I think it's from the Indigogo page:

Q: What is the maximum power output from the 3.5mm jack in milli-watts into 32 ohms headphones? I do not understand what 2x current means.

A: The 2x current mode is a kind of parallel bridged amplifier mode. EarStudio has two stereo DAC and integrated HP AMP, which means it has 4 output ports available. In the 1x current mode to 3.5mm jack, EarStudio activates only two of them, having the other two remained at idle. In the 2x current mode to 3.5mm jack, all four output ports are activated, being coupled two ports for L-ch, two ports for R-ch.

Each output port drive voltage up to 3.2 Vpp. Thus, for a 32-ohm unit, we can have 40mW/ch with EarStudio. In the 2x current mode, two output ports are bridged/combined to a single channel, we can get the output impedance lowered by half, and as a result, get the better damping factor and slew rate. Especially for a 16-ohm unit, current saturation degrades the linearity, and the 2x current mode gives us the better performance.

 

[jasonb]

I need to order one from Amazon and try it. If it's not enough I could just return it since Amazon is easy that way.

 

[kukkurovaca]

I need to order one from Amazon and try it. If it's not enough I could just return it since Amazon is easy that way.

It's a great little device -- aside from the somewhat flimsy clip. : )

 

[jasonb]

It's a great little device -- aside from the somewhat flimsy clip. : )

I would probably Velcro it or something instead anyway.

 

[kukkurovaca]

I would probably Velcro it or something instead anyway.

Yep. Here’s mine dual-locked to a Ray Samuels SR-71A

 

[Sebastien Chiu]

Anyone know how to get in touch with support for a replacement device? The 3.5mm jack failed yesterday and I can't replace through Amazon as I purchased it in May. Thanks!

 

[BenF]

Anyone know how to get in touch with support for a replacement device? The 3.5mm jack failed yesterday and I can't replace through Amazon as I purchased it in May. Thanks!

support@radsone.com

 

[jasonb]

I just ordered one and I have a Q701 cable I can shorten so I can just attach the ES100 to the Q701 somewhere. Did next day shipping for $14 cause I'm off tomorrow and impatient. So I'll know how this works tomorrow afternoon. I'll probably use aptX HD since I just listen to music through the Google Play Music app. Excited to use my Q701 without wires.

And I think it's going to be plenty powerful enough. I have a cheap $25 Bluetooth receiver (it's called "OT-Adapt) I got years ago for routing music into a motorcycle helmet that is loud enough for my Q701 even at about 60% volume. I'm sure the es100 is many times more powerful than this little piece of junk, and I'm sure it'll sound a lot better as well.

 

[peter123]

I don't listen very loudly though which is what might make it work for me. A Hidizs Sonata HDII USB-C DAC dongle at half volume gets them loud enough for me and I think they still sound good on it.

.3 volts and 1.42mw is what it takes to get a Q701 to 90db according to inner fidelity, and I definitely listen at less than 90db.

I'm trying it out right now and with volume at about 80% on the ES100 and my phone maxed I've got my normal listening level. Might be too little with quietly recorded music.

 

[jasonb]

I'm trying it out right now and with volume at about 80% on the ES100 and my phone maxed I've got my normal listening level. Might be too little with quietly recorded music.

With a Q701?

 

[peter123]

With a Q701?

Yep