The WH-CH520s have a V-shaped sound signature with boosted bass and smooth highs, but mids can sound hollow without EQ adjustment.

XM5s have gentler sound effects for notifications compared to the more pronounced chimes of the XM3/4 models.

The XM3s are praised for superior sound quality over the XM4/5, partly due to AptxHD support.

The WH-CH520s have been compared to the Koss Porta series for their surprisingly good sound quality at a low price, though lacking in midrange detail.

XM4's ANC outperforms the Sennheiser Momentum 4's for low-frequency noise but falls short in overall sound quality compared to audiophile options like B&W PX7 S2e.

Frequent wiping of the XM3/XM4 ear pads with a damp towel (avoiding alcohol) reduces aging effects from oils and sweat.

EQ adjustments are frequently recommended to enhance the XM4's sound clarity, as the stock sound can be perceived as muffled or "veiled."

The XM5s, with softer ear pad density and lighter clamping force, are suitable for long study sessions or sleeping.

These headphones are favored for non-critical listening and suitable for podcasts, as they offer decent midrange performance compared to higher-end models.

The XM5's ear detection uses internal mics to guess when worn, unlike visible sensors, aiding automatic pausing.

These headphones offer USB-C charging, a long 50-hour battery life, and access to Sony's app features like DSEE and a 5-band EQ with clear bass control.

The WH-CH520s lack a dedicated mute button and sidetone, a significant difference from the WH-CH510 model, which had noticeable sidetone issues.

The XM4 headphones offer a distinct "rosey sound" that appeals to users seeking enjoyable, bass-rich music experiences combined with effective ANC.

Some XM5 owners report pivot dislocation issues; handling the headphones by the telescoping arm can help prevent stress on the fitting.

The WH-CH520's plastic construction feels solid, resembling more expensive models, with pleather earpads that are moderately comfortable but can heat up after an hour of use.

Some users experienced hinge durability issues, with earcups snapping off after prolonged use, underscoring potential longevity concerns.

Owners note that the headphone's physical buttons feel like one continuous piece, making it challenging to distinguish controls by touch.

Users report that the XM4's touch controls can malfunction, and sound quality declines significantly during calls, which is a common complaint.

The XM4s are considered a great value, especially when found on sale for around $200, offering a balanced mix of ANC and satisfactory bass performance.

A popular ear pad modification involves placing a cord underneath for enhanced comfort, significantly improving the wearability of the XM4 headphones.