This is a review, detailed measurements and listening tests of Topping DX7 Pro+.

As you see, the DX7 Pro+ sports the newer look of some Topping products. I did not care for it much before but it is growing on me.  Three different headphone jacks are provided and all provide the same output, eliminating the need for adapters.

AC adapter is nicely built-in and we have the useful trigger input/outputs so that you can sequence power up of auxiliary gear.

Topping DX7 Pro+ DAC Measurements
Let’s start with our usual dashboard using balanced out:

Wow, for some reason I did not expect record breaking SINAD but we have it:

A newer current to voltage converter may be behind this advancement.

RCA performance is nearly as good:

Dynamic range is of course superb:

As is distortion in both IMD and multitone:

Jitter and noise is superbly low/unmeasurable:

I don’t think I have ever seen the 24-bit squarewave bits resolved as well as here on the left.

Linearity is perfect of course:

The usual filter set is provided:

To make it easier to select one, here is the response up to cut off frequency:

Filter 3 is the default and seems like the right choice (together with Filter 5).

Using those two optimal filters we get superb wideband performance vs frequency:

This is impeccable performance for a DAC.

Topping DX7 Pro+ Headphone Amplifier Measurements
Let’s start with our dynamic range for 50 mv output:

This is great but not chart topping:

Power is just about everything so let’s look at that at 300 ohm:

This is plenty to drive high impedance headphones. I like that it doesn’t clip so if you hear any distortion, it is your headphone doing it, not the amplifier!

Switching to current limited 32 ohm, we get:

This is lots of power as well combined with exceptionally low noise and distortion especially in low gain mode.

Finally, here is our sweeps at different impedances:

Remember that Power = Volt * Volt/impedance. So you can determine how many watts you have at any of the above impedances before clipping.

Topping DX7 Pro+ Headphone Listening Tests
I started to listen with my everyday and difficult to drive Dan Clark Stealth headphone. There was plenty of volume to get these cans going. I could get the amp to distort on one track from -3 dB to 0 dB but that was not a volume I could tolerate in normal listening. Sound was beautiful, detailed with a quiet background allowing me to hear deep into the recordings.

Switching to Sennheiser HD650 provided a superb experience as well. There was so much power available that I could go beyond any reasonable listening level. Fidelity was exceptional. So much so that I did not want to put them down and take picture of the unit for the review!

Conclusions
We expect the best from Topping and yet, they still manage to surprise in how well they execute. To create a DAC to break their own records requires a level of self motivation for excellence that few companies attempt. The performance of DX7 Pro+ is just stunning in this regard with no fault to identify whatsoever.

The headphone amplifier is also quite a performer albeit with a target just shy of stand-alone amps from Topping. Superb experience is to be had with the combination leaving nothing to complain about.

It is my pleasure to recommend Topping DX7 Pro+. The product personifies dedication to excellence in engineering and design.