The Apogee Rosetta AD - Mega Audio

The Apogee Rosetta AD — Specifications 

Analog and A/D Converter 

Parameter Value Units 

Resolution 24 bits 

Sample Rate 44.1–48, 88.2–96 kHz ±10% 

Input Impedance 

Pro 9K Ω 

Consumer 15K Ω 

Relative THD+N 

–0.1 dBFS –110 dB (unweighted) 

–112 dB (A-weighted) 

–20 dBFS –91 dB (unweighted) 


–60 dBFS –56 dB (unweighted) 


Dynamic range 

–60 dB, Unweighted 116 dB 

–60 dB, A-weighted 119 dB 

Peak Spurious Component –126 dB (max) 

Group Delay (in passband) 34/Fs seconds 

Passband Ripple ±0.001 dB 

Digital Filter Stopband 0.5542Fs kHz 

Stop-band Attenuation 117 dB 

Channel Separation 

Left/right 120 dB (worst case) 

Frequency Response (10 Hz–20 kHz) 

Gain ±0.025 dB 

Phase < 0.01 degrees 

Common-Mode Rejection Ratio 

60 Hz >> 100 dB 

1 kHz >> 80 dB 

Input Level, maximum (no gain) 

Professional, balanced 27 dBu 

The Rosetta AD’s frequency 

response (shown left, Fs=48 kHz) 

and Total Harmonic Distortion plus 

Noise (right) show the exceptional 

performance of this unit. The 

Rosetta AD not only out-performs 

other converters in its price range: 

it out-performs converters costing 

many times more. This is the 

Apogee tradition. 

Parameter Value Units 

Professional, unbalanced 23 dBu 

Consumer, balanced 16 dBu 

Consumer, unbalanced 15 dBu 

Input Level, adjustment range 20 dBu 

Crystal Oscillator accuracy ±50 ppm 

Clock Jitter, 32kHz–106 kHz

The Rosetta AD – Your Analog to Digital Solution. 

NOW YOU CAN AFFORD to bring worldclass 

audio quality to your digital 

recordings: install an Apogee SOLUTION 

SERIES converter in front of your DAT recorder, 

MDM or DAW, or on the output of your analog 

console. 

For over a dozen years, Apogee Electronics has set the 

standards in digital audio. From the first high-definition 

filter designs to the latest high-end, high-resolution, high 

sample-rate converters, Apogee has led the field. 

For our next products, we decided to set our engineering 

department some new and challenging goals. They 

were to design a new line of conversion products 

especially for the project studio owner. It should be made 

available at a lower price point, but without risking the 

quality—there was no way would we consider compromising 

the unique sound of an Apogee converter simply to 

meet a price. 

The result is Apogee’s new SOLUTION SERIES. 

No-compromise conversion products, true Apogee quality, 

tailor-made for your project studio, at a price you can 

easily justify. Now everyone can own an Apogee—beginning 

with the astonishing ROSETTA AD 24-bit, 2-channel 

analog to digital converter. 

The Rosetta AD is a 24-bit analog to digital converter 

with all the most common digital interfaces—AES/EBU, 

ADAT, TDIF and S/PDIF—included as standard. 

The feature set of the Rosetta AD has been carefully 

tailored to project studio requirements. You 

won’t pay for extensive features you’ll 

never use: we carefully researched 

exactly what facilities you need and 

expect from an outboard A/D 

converter… and deliver them 

in an affordable, compact, 

1U rack-mount package. 

The Rosetta AD 

features analog 

The Rosetta AD at a glance 

• High quality Apogee 2-channel 24-bit A/D conversion 

at an affordable price. 

• 44.1/48 or 44.1/48/88.2/96kHz versions 

• Ideal for project studio recording and mastering to 

DAT, MO or modular digital multitracks 

• 2xAES/EBU, S/PDIF, ADAT, TDIF interfaces 

• UV-22HR Improved high-resolution word-length 

reduction to 16 and 20 bits 

• Pro/consumer levels, balanced/unbalanced 

• User-defined over indication 

• Simple to operate, stylish front panel 

• Easy-to-read bar-graph metering. 

inputs operating at pro or consumer levels, balanced or 

unbalanced. The highest quality Apogee 24-bit conversion 

drives two AES/EBU outputs so you can feed two 

machines at once. In addition, ADAT, TDIF, and S/PDIF 

coax/optical interfaces are all built-in, for the absolute 

maximum in quality and flexibility! 

Choose the standard version, with 44.1/48 kHz sample 

rates; or go for gold with the 96 kHz version, offering 44.1, 

48, 88.2 and 96 kHz sample rates. You can even upgrade 

from one to the other. 

Apogee’s renowned Soft 

Limit® technology allows you to 

record at the maximum level 

without overs, and our new highresolution 

UV22HR® process 

allows you to generate flawless 

The standard Rosetta 

AD offers 44.1 and 

48 kHz sampling, 

while the high-density 

“Rosetta 96” adds 

88.2 and 96 KHz 

rates. You can even 

upgrade to 96 later! 

16- and 20-bit masters retaining 

as much of the original 24-bit 

resolution as possible. 

Apogee’s exacting analog and 

digital design assures top audio 

performance without compromise, 

including excellent stereo 

imaging and the unique, transparent 

Apogee sound. 

The panel of the Rosetta AD is designed for quick and 

easy operation. Every function has its own control, clearly 

labeled to avoid confusion. The metering features easy-toread 

bar-graph LEDs with oversize “over” indicators—and 

you can determine how many consecutive digital full-scale 

samples constitute an over. 

Try the Rosetta AD at your Apogee dealer today. You’ll 

find it the perfect future-ready tool for translating analog 

signals to digital—without compromise—at a price you 

can afford. 

The quality of Apogee converters is the foundation of 

our reputation. We just made it easier to own one. 

UV22HR—New & Improved 

Although the Rosetta offers 24-bit resolution, there 

are still plenty of applications that don’t need—or allow— 

that level of resolution. CD, DAT and MDMs are still generally 

16-bit, or 20-bit at most. 

Our solution: UV22HR, the latest “high resolution” 

development of our industry standard UV22 wordlength 

reduction system, used on most top US CD 

releases. UV22HR preserves even more of the original 

resolution than before. You enjoy the true 

theoretical noise floor at your chosen word 

length, but, like analog, you can hear significant 

extra detail below the noise. UV22HR makes digital 

sound more like analog—without the drawbacks. 

What’s In A Name? 

The Rosetta Stone, 

discovered by Napoleon’s 

soldiers in Egypt in the 

18th century, provided 

the key to translating 

the mysterious hieroglyphs 

of the Ancient 

Egyptians. In the 

same way, Apogee’s 

Rosetta AD is the key 

to flawless translation of 

analog signals into 

multiple digital formats. 

The Rosetta AD includes all 

the most common standard 

industry digital interfaces— 

ADAT, TDIF, AES/EBU and 

S/PDIF (optical and coax). 

It’s the ideal front-end for all 

your digital gear, from CD 

and DAT recorders to 

modular digital multitracks; 

from computers to video 

editors (see below). 

Interfacing your present or 

future gear is a snap!

The Apogee Rosetta AD - Mega Audio

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