Sennheiser HD 800 S Dynamic Open-Back Stereo Headphone Kit with Grace Design M900 Amplifier

Professional Monitoring Kit for Audiophiles and Studio Use

If you're a music producer, mixing engineer, or discerning audiophile looking for a professional-grade headphone monitoring solution, this B&H Exclusive Kit has everything you need. It combines two top-tier components: the Sennheiser HD 800 S Dynamic Open-Back Stereo Headphones and the Grace Design m900 Compact Headphone Amp, DAC, and Preamp, delivering a turnkey setup for critical listening and precision audio work.

Sennheiser HD 800 S Dynamic Open-Back Headphones

The Sennheiser HD 800 S is a flagship open-back headphone, engineered to provide a natural, transparent listening experience that reveals every detail in your audio. Perfect for mixing, mastering, or high-end personal listening, these headphones are a refined update to the acclaimed HD 800 model, incorporating advanced acoustic innovations and premium materials.

Precision-Engineered for Exceptional Sound Quality

At the heart of the HD 800 S is a 56mm dynamic transducer, one of the largest used in headphones. This driver is enclosed in a stainless steel housing and paired with Sennheiser’s absorber technology, which reduces the "masking effect", a phenomenon where loud low-frequency sounds obscure higher frequencies. This results in a full-spectrum, highly detailed audio reproduction, making it easier to hear subtle nuances in your mix.

Comfortable and Durable Design

The HD 800 S is built for long sessions with handcrafted microfiber ear pads, a lightweight 11.6 oz frame, and a metal headband with inner damping for reduced mechanical vibrations. The earcups are carefully angled to deliver a realistic stereo image, emulating the soundstage of high-end studio monitors.

Multiple Connection Options

For flexible connectivity, the HD 800 S includes both a standard 1/4" stereo cable and a balanced 4.4mm cable, perfect for use with high-end headphone amplifiers or balanced outputs.

Key benefits of the Sennheiser HD 800 S:

• Frequency response from 4 Hz to 51 kHz for ultra-wideband clarity

• 300 Ohm impedance, ideal for high-end amplification

• Open-back, circumaural design for natural acoustics

• Custom cable with low capacitance and high-precision connectors

• Minimal resonance housing for a pure, uncolored sound field

Grace Design m900 Headphone Amplifier, DAC & Preamp

The Grace Design m900 is a compact and portable yet incredibly powerful headphone amp, DAC, and stereo preamp designed to meet the demands of professional audio workflows. Whether you're working in a DAW-based studio or want reference-quality headphone monitoring on the go, the m900 delivers transparent, detailed playback from digital sources like USB, S/PDIF, and TOSLINK.

High-Resolution Digital Audio Conversion

At its core is the AKM 4490 DAC chip, supporting 32-bit processing and sampling rates up to 384 kHz PCM or DSD256. Its asynchronous USB interface ensures jitter-free playback by making the m900 the master clock, delivering a rock-solid digital audio signal.

Versatile Power and Connectivity

The m900 is optimized for both USB bus power and external high-power mode via the included 2A USB power supply, making it capable of driving high-impedance headphones without compromise. Whether you're monitoring in a studio or working remotely, the m900 adapts to your setup with ease.

Connection options include:

• USB, S/PDIF, and TOSLINK digital inputs (up to 192 kHz / 96 kHz on TOSLINK)

• Dual zero-ohm headphone outputs for uncompromised sound quality

• RCA stereo outputs for connecting to speakers or monitor systems

Designed for Detail, Built to Travel

The zero-ohm output impedance and trans-impedance amplifier topology provide a transparent, expansive soundstage, while the cross-feed circuit emulates the spatial experience of listening to speakers, ideal for longer mixing sessions. A 7-segment LED display shows volume and settings, and the large rotary encoder offers intuitive control.

Key benefits of the Grace Design m900:

• Four DAC filter settings to fine-tune your playback

• Rugged, portable design, ideal for desktop, travel, or mobile studios

• Simple setup menu for quick calibration and configuration

• Made in the USA with a 5-year transferable warranty

The Ultimate Headphone Monitoring Solution

When combined, the Sennheiser HD 800 S headphones and the Grace Design m900 amp/DAC deliver a reference-level monitoring system perfect for audio engineers, musicians, and audiophiles who demand clarity, precision, and immersive sound. Whether you're mixing in the studio or enjoying high-resolution music at home, this kit provides a professional and portable listening experience that’s hard to beat.