The DT 150 extends more on both ends of the frequency spectrum, appart from that there shouldn't be much difference. I'll get one soon for my studio.

beyerdynamic DT 100 Headphones, 400 Ohm, Black - Gear4music

The DT 100 is a handset used worldwide in many recording studios for monitoring purposes. It is also suitable for ENG / EFP use and live-moderation.Pro Neutrik DT100 / DT150 Headphone Lead 2m, 3m, 10m and 15m, a spare cable for Beyer DT100 & DT150 headphones.

beyerdynamic DT-100/16-B – Thomann UK

Stereo headphonesThe DT 100 is a handset used worldwide in many recording studios for monitoring purposes. It is also suitable for ENG / EFP use and live-moderation. The DT 100 is a dynamic studio headphone widely used for audio recording and monitoring in studios across the world. The DT 100 boasts wide frequency response, high sensitivity and high sound pressure making them ideal for use in broadcasting, filming and in the studio. Thanks to the soft, circumaural earpads, the DT 100 sits comfortably on the head during long periods of use, whilst also creating an effective seal keep ambient noise out. I tried the DT150 once, quite a while ago, and that was actually surprisingly good. It isn't a DT770-killer, but still a respectable closed headphone.

The Beyerdynamic DT 100-series studio monitor headphones is a German masterpiece crafted to precision and perfection with the latest technological and industrial grade components. Other features include: A selection of Beyerdynamic spares for DT100 , DT108 , DT109 (applicable to all models unless stated). Some spares are available in sets to suit more common repair tasks.

DT 100: The standard headphones for monitoring - Beyerdynamic

A high level of ambient noise attenuation is achieved with the concave ear cups design and they are exceptionally comfortable with a soft microfiber layered headband and ear pads.

The layered plastic and metal headband construction attenuate sound vibrations to the earcups and the earpads made up of handmade microfiber offer exceptional comfort for long listening periods and enjoyment. STAX SR Lambda Pro Classic, STAX SR-5 Gold, STAX SR-001, beyerdynamic)))) DJX-1, beyerdynamic)))) DT 990 Pro (250 Ohm), AKG K-501, AKG K-340, beyerdynamic)))) DTX 50, Cowon A3 Buds, beyerdynamic)))) DTX 20, AKG K-14P, Sennheiser Unipolar 2000 Due to its closed and robust design, the DT 100, which is well-known in recording studios worldwide, is ideally suited for monitoring and ENG/EFP applications. With its soft, circumaural ear cushions, the headphones offer a high degree of wearing comfort and convince with their closed design with excellent isolation from external noise. This 400 Ohm version is perfect for monitoring in the studio. Key Features