• Account
  • View Shopping Cart

Menu Search View Shopping Cart Call Us
desktop

Grace Design m900 Portable Headphone Amp  From Grace

Compact portable headphone amp, DAC

Grace Design

$660.00

No Sales Tax in OH!
No Sales Tax in 45 States. Learn More.

Retail:  $695.00

"Experience the Difference"

Sound Pure's 3-Year Warranty

Close
Our Free 3-Year Warranty!
In addition to the standard included manufacturer warranty, virtually all new products carry our exclusive, industry-leading, absolutely free, Sound Pure 3-Year Warranty, which includes PARTS & LABOR. This high-value perk is our way of providing the ultimate in added value to enhance the unique personal touch our small, dedicated team contributes to each purchase.
Learn more »

Lifetime Support

Close
Free Lifetime Technical Support!
Our small team of dedicated experts is here to help the original purchaser for the lifetime of the product. Why? Because we care about building real relationships with our customers for life and stand behind every product we sell.

Free Shipping

Close
This Product Ships Free!
Products ship from our well-located, climate- and humidity-controlled warehouse absolutely free (inside the continental USA). Low-cost international shipping options exist for most products.
Contact us for details »

No Sales Tax collected in OH.

Close
Sales Tax
Sales tax is only collected in the following states: CA, FL, NC, SC, TN and VA. If your state is not listed, sales tax will not be collected on your order.
Contact us for up-to-date delivery estimate.
Payments as low as $58/mo.

Manufacturer's Description from Grace

Tiny Box, Huge Sound

The m900 is a portable, desktop friendly headphone amplifier / DAC / preamp combo designed to give audio professionals and enthusiasts musical and transparent audio playback from USB, S/PDIF or TOSLINK sources. For small DAW studio setups, portable laptop editing or mixing rigs, or just pure playback enjoyment, the m900 provides the same analog and DAC quality as our large monitor controllers, but in a small, rugged and surprisingly affordable unit.

Incredible DAC Performance

The m900 DAC uses the latest generation AKM 4490 chip, which features 32-bit processing and supports sample rates up to 384kHz PCM or 256x DSD. The USB interface operates in asynchronous mode allowing the m900 to be the clock master which makes the system immune to USB bus jitter. S/PDIF and Toslink inputs allow the m900 to enhance to any DAW interface with true reference quality D/A conversion, headphone monitoring and stereo speaker control.

Intelligent Power Supply Design

An intelligent power supply design allows for two power operation modes – LOW and HIGH. LOW power mode is from USB connector #1, which provides bus power along with data, allowing the m900 to operate from a single connection to your computer. HIGH power power mode is available by connecting the included 2A USB DC power supply to the USB connector #2, which provides additional power for harder to drive headphones.

Superb Audio Performance

Transimpedance amplifier topology coupled to a zero ohm output impedance driver provides headphone performance that is incredibly spacious and transparent with a tight, enveloping low end. Our latest generation crossfeed circuit rounds out the design by simulating an acoustic listening environment in the headphones. Familiar tracks become new again with surprise details, while audio production tasks like tracking, mixing and editing happen faster and easier.

After many years of honing our DAC and headphone amplifier designs, the m900 distills the best of what we’ve learned in a compact, rugged and simple unit. Whether in the studio, on your desk or on the road, the m900 will bring you closer to the music you love.

Features

  • USB, S/PDIF and Toslink digital inputs, supports up to 192kHz (Toslink up to 96kHz)
  • Asynchronous USB interface for jitter free computer audio playback, supports up to 384kHz PCM and 256x DSD
  • Dual zero ohm output impedance headphone outputs
  • Unbalanced level controlled outputs via RCA for connecting to a stereo monitor system
  • Compact, portable chassis perfect for travel, desktop or studio
  • Mono mode, Left minus Right mode
  • 6 monitoring modes: stereo, L&R swapped, left in both channels, right in both channels, left channel only, right channel only
  • Channel balance adjustment
  • Low power mode via USB Bus power
  • High power mode via included USB 2A power supply
  • 4 different DAC filter settings to tailor playback performance to personal preference
  • Simple user setup menu for setup and calibration
  • 7 segment LED display displays level and setup menu information
  • Large rotary encoder for volume control and setup menu navigation
  • Made in Lyons, CO USA
  • 5 year transferable Warranty
Grace Design

About Manufacturer

Audio engineer/designer Michael Grace originally began building single order custom audio products for a small, devout following of recording engineers and artists is 1990. Before long, the word had spread about Michael's custom microphone preamplifier designs, which were said to outperform anything else that was commercially available. Based on an increasing demand for his mic preamp design, in 1994 Grace Design was founded and began production of the original 801 mic preamp. Not only did the 801 provide a new level of audio performance and functionality, it helped to establish outboard microphone preamplifiers and direct-to-tape recording as a new standard in professional audio production. Over the years, Grace Design has maintained a steady, methodical pace to developing new products and technologies. Our product line has evolved into a definitive collection of microphone preamplifier configurations and other unique professional audio products. While the professional audio industry is inundated with products seemingly designed for obsolescence, we pride ourselves on providing audio professionals with the finest tools imaginable. Located in Boulder, Colorado, Grace Design continues its mission into the new millennium. As our company grows, we continually strive to improve our production methods to make sure theya re exact, efficient and environmentally sound. Their employees are treated like family and they strive to improve our production mehods to make sure they are exact, efficient and environmentally sound. Our employees are treated like our family and we strive to maintain our business relationships as friendships. And above all, we remain driven by the original passion that founded the company- the love of music.

Specifications

THD+N at Maximum Volume, 1kHz, 22Hz-22kHz BW
@1.0V out, no load <0.002%
@1.0V out, 32 Ohm load <0.010%
Intermodulation Distortion SMTPE/DIN 4:1 50Hz, 7kHz
@1.0V out, no load <0.008%
@1.0V out, 32 Ohm load <0.009%
Frequency Response +/-3dB
Fs=96kHz 0.5-45.9kHz
Dynamic Range
20-22kHz bandwidth 112 dB
20-22kHz bandwidth and A weighting filter 115 dB
Output Noise
20-22kHz, volume=0-90 -106dBV
A weighting filter, volume = 0-90 -109dBV
20-22kHz, volume=90.5-99.5 -96dBV
A weighting filter, volume = 90.5-99.5 -98dBV
Crosstalk
100Hz <107dB
1kHz <98dB
20kHz <72dB
Attenuation Range
0 to -99dB, 0.5dB steps
Crosstalk Tracking Accuracy
+/-0.05dB
Maximum Output Level, No load
Low Power Mode +14.1dBV (5.1V)
High Power Mode +15.5dBV (6.0V)
Impedances
Headphone Output 0.08 Ohms
Line Output 47.5 Ohms
Input Lock RangeSample RateLock Range
S/PDIF 44.1kHz 43870-45420Hz
  48kHz 46590-49220Hz
  88.2kHz 87760-90830Hz
  96kHz 93520-98430Hz
  176.4kHz 175700-181640Hz
  192kHz 187050-196380Hz
     
TOSLINK 44.1kHz 43900-45410Hz
60Hz 48kHz 46590-49190Hz
60Hz 88.2kHz 87840-90830Hz
60Hz 96kHz 93520-97530Hz
     
USB supported sample rates 44.1, 48, 88.2, 96, 176.4, 192, 352.8, 384kHz
Power Consumption
Max, High Power mode 8.0W
Max, Low Power mode 2.5W
Dimensions
4″ x 5.25″ x 1.8″
Headphone Output Power / Low Power ModeOutput Power mW 
S/PDILoad Resistance Ohms 1 Channel Driven 2 Channels Driven
4 80 22
8 140 45
16 310 90
20 350 100
32 600 175
50 560 280
300 83 83
600 40 40
Headphone Output Power / High Power ModeOutput Power mW 
S/PDILoad Resistance Ohms 1 Channel Driven 2 Channels Driven
4 925 240
8 1800 490
16 1900 940
20 1575 1030
32 1020 950
50 680 650
300 115 115
600 57 57