The Music Two uses a dual driver assembly with a single output port, damperless, with tube resonances controlled by a stepped acoustic horn. The woofer driver of the Music Two is filtered by an acoustic low-pass design, trademarked by Sonion as AcuPass. This type of low-pass technology is similar to that used in the Shure SE846 (just simplified). The Music Two's woofer is vented for better low frequency extension and headroom. Normally, the vented configuration of the woofer causes the bass response to rise well above neutral, but with a special construction method Peter controls the back venting volume, giving a small bass thump centered around 80-100 Hz, while preserving bass extension. As far as I'm concerned, no other company that uses silicone shell materials implements bass venting and back volume control. CustomArt started it with the Music One and Pro330, and now the Music Two has it.
With regard to tech specs, the Music Two has a minimum impedance (not including cable resistance/reactance) of 22 Ω @ 4200 Hz and DCR of 41.5 Ω. Impedance @ 1 kHz is 75 Ω, but that's just a transient value; the Music Two should be easy to drive from the most common audio sources.
People concerned about output impedance pairing with amps and DAPs should look at the 22 Ω value and pair accordingly. If we use the 8× damping factor rule-of-thumb, then OI should be no higher than 2.75 Ω on your sources. However, output impedance affects mainly only the mid-highs and lower treble of the Music Two. Here is a graph of the difference between the response of the Music Two when paired with a high output impedance source (~20 Ω), and a low output impedance source (~0.5 Ω, green trace). Depending on personal preferences, people can use different output impedance sources (e.g. CEntrance HiFi-M8, or serial resistance adapters) to alter the desired mid-highs.
With regard to bandwidth, +/- 20 dB tolerance would give the Music Two an effective bandwidth from <20 Hz to >17 kHz.