DSP ULN2-2604 D
DSP ULN2-2604 D
Description
ASCENDO DSP ULN2-2604 Ultra-Low-Noise Amplifier: Pure Sound. Pure Emotion.
When you listen to music, watch a movie, or experience immersive audio, you don’t just want sound—you want emotion. You want to feel the depth of a piano note, the raw power of a cinematic explosion, or the warmth of a singer’s voice as if they were standing right in front of you.
But achieving pure, unaltered sound isn’t easy. Most amplifiers introduce unwanted noise and distortion, which gets amplified even more when using high-sensitivity speakers. That’s why we created the ASCENDO DSP ULN2-2604—so you can experience sound exactly as it was intended.
Why Standard Amplifiers Fall Short
Most amplifiers claim to be "quiet," but only because they are used with low-sensitivity speakers (85-89dB/1W/m). ASCENDO speakers are different—we push the boundaries with sensitivity levels up to 117dB/1W/m, 20dB above industry norms.
This level of precision means every imperfection in an amplifier becomes clearly audible. To "fix" this, many manufacturers reduce noise artificially by adding resistors that absorb sound energy—but this also removes control, clarity, and impact. The result? A loss of detail, weak dynamics, and an artificial sound signature.
The ASCENDO Solution – A Revolution in Sound Purity
With the DSP ULN2-2604, we didn’t just create another amplifier—we redefined what an amplifier should be. This amp is built for absolute clarity, precision, and emotional impact.
What You Get When You Choose the DSP ULN2-2604 Amplifier
- Unparalleled Silence: Experience a noise floor so low that even in the quietest rooms (NC0 to NC15), the only thing you hear is the purest sound possible.
- Music Without Compromise: Every note, every detail, every whisper is delivered with absolute precision—no distortion, no coloration.
- Deep, Controlled Bass: No artificial dampening, no loss of control—just tight, accurate bass with the highest damping factor possible.
- The Power of Advanced DSP: Built-in FIR filter options let you fine-tune your system for perfect phase accuracy and frequency response.
- A True Audiophile Experience: Whether you're listening to music, watching a film, or designing a world-class immersive sound system, this amplifier ensures every moment feels real.
Engineered for Maximum Flexibility
Great sound means freedom to create. That’s why the ULN DSP amplifier includes:
Advanced Matrix Routing: Perfect for bass management, downmixing, and sophisticated signal routing.
Seamless Audio Integration: Audio over IP (native Dante® and AES67), balanced AES3, and analog inputs for modern and legacy systems.
Universal Power Supply: Works globally (100-240V) with no compromise in performance.
Performance You Can Trust – No Marketing Gimmicks
At ASCENDO, we don’t just claim exceptional performance—we prove it. Unlike many manufacturers who provide incomplete specs, we publish a full, detailed datasheet with laboratory-verified results.
Your Music, Your Movies…As They Were Meant to Be Heard
With the ASCENDO DSP ULN2-2604, you’re not just buying an amplifier—you’re investing in a pure, emotional sound experience. Whether you’re an audiophile, a home theater enthusiast, or a professional looking for the ultimate low-noise amplifier, this is the one that delivers.
Experience the difference. Check the official datasheet for full specifications.
Specification
Inputs
ADC Frequency Response
20 Hz - 20 kHz: +0.0 -1.0 dB (Slow Roll-off Filter)
ADC Dynamic Range
typ 130 dB (A)
ADC Fullscale
20 dBV, 22.2 dBu, 10 V RMS
Analog Input Impedance
200 kOhm
AES3 Samplingrate
44.1 kHz - 192 kHz ASRC
DANTE Samplingrate
48 kHz / 96 kHz
DANTE RX Channels
2
Outputs
Output Power (EIAJ Test Standard 1 kHz 1% THD)
LF: 2000 W @ 4 Ohm | 1390 W @ 8 Ohm HF: 280 W @ 4 Ohm | 140 W @ 8 Ohm HF Bridge: NA @ 4 Ohm | 280 W @ 8 Ohm Line Out: N/A
Max Output Voltage
LF: 149 V peak HF: 50 V peak HF Bridge: 100 V peak Line Out: 6.3 V peak | 4.47 V RMS | 15.2 dBu
Max Output Current
LF: 38 A peak HF: 20 A peak HF Bridge: 20 A peak Line Out: N/A
Max DC Offset
LF: < 30 mV HF: < 20 mV HF Bridge: < 25 mV Line Out: < 2 mV
Max Capacitive Load
LF, HF, HF Bridge: < 300 nF Line Out: unlimited
Frequency response
LF, HF, HF Bridge: 20 Hz - 20 kHz / 4-8 Ω: +0.4 -1.8 dB Line Out: 20 Hz - 20 kHz: +0.0 -1.8 dB (DAC Slow Roll-off Filter)
Output Noise (Analog Input)
LF: typ 78 µV (A) HF: typ 27 µV (A) HF Bridge: typ 43 µV (A) Line Out: typ -106 dBu (A)
Output Noise (Digital Input)
LF: typ 73 µV (A) HF: typ 23 µV (A) HF Bridge: typ 36 µV (A) Line Out: typ -107 dBu (A)
Dynamic Range (Digital Input)
LF: typ 123 dB (A) HF: typ 123 dB (A) HF Bridge: typ 125 dB (A) Line Out: typ 122 dB (A)
CCIF IMD (18 + 19 kHz -10 dB relative to max Power, 4 Ohm)
LF: typ -87 dB HF: typ -89 dB HF Bridge: typ -89 dB Line Out: typ -102 dB
DSP
Architecture
ARM-based floating point
Inputs (Channels)
4 x input matrix per channel (DANTE / AES67 via DEP/ AES3 / Analog), sine, white- pink- brown-noise
Level Control
Mute, Volume, Phase
User-Strip Filter
32 x EQ / Highpass / Lowpass
Filter types
bell, notch, highshelf, lowshelf, allpass 1st / 2nd order
High- Lowpass types
6 - 48 dB/Oct, Bessel, Butterworth, Linkwitz/Riley, Variable Q
FIR Filter
512 Tabs, ASCII file import
Delay
48000 Samples / 330m / 1s (resolution 0.001 units) per channel
Converters
ADC: ES9822PRO (2CH dynamic range extender) DAC LF: ES9081 DAC Line Out: ES9081 DAC HF: ES9039Q2M
Connector
Control input connectors
Dual RJ45 ( 1 Gbit/s Ethernet )
Audio signal input connectors
RJ45 (4 x DANTE / AES67) XLR (1 x Analog In balanced, 1 x AES3)
Audio signal output connectors
XLR (1 x Analog Out balanced, DSP controlled)
Speaker connector
1 x Neutrik Speakon + 1 x Neutrik Speakon bridge mode
12 V Trigger In
Galvanic Isolated 3.5mm TS (Mono) audio jack (Tip +12 V, Sleeve GND)
AC mains
IEC C20 inlet / IEC C19 plug
AC Mains Power
Power Supply
Universal, regulated switch mode with PFC (Power Factor Correction)
Operating Voltage
90 - 264 VAC 50 / 60 Hz
AC Current typ.
@ 230 V: 1.65 A @ 110 V: 3.5 mA
Inrush Current
25 A max.
Suggested circuit breaker
B16
Earth Leakage Current
< 0.4 mA / 240 V
Thermal
Enviromental operating temperature (Cooling)
0 - 40°C
Thermal dissipation
Fan, variable speed, temperature controlled front to rear airflow
Idle
@ 230 V: 34 kcal / h | 135 BTU / h @ 110 V: 30 kcal / h | 118 BTU / h
1/8 power @ 4 Ohm (1/8 power @ 8 Ω)
@ 230 V: 102 kcal / h | 405 BTU / h @ 110 V: 100 kcal / h | 398 BTU / h
1/4 power @ 4 Ohm (1/8 power @ 4 Ω)
@ 230 V: 153 kcal / h | 606 BTU / h @ 110 V: 168 kcal / h | 667 BTU / h
User Interfaces
Hardware
Multicolor LED for LF and HF Power Switch Red/Green LED
Software
MAXX REMOTE RESTful-API
Dimensions & Weight
Dimensions (W/H/D) mm
482.6 | 87.50 | 389.29 (2RU)
Dimensions (W/H/D) inch
19 | 3 7/16 | 15 5/16 (2RU)
Packing Dimensions (W/H/D) mm
540 | 240 | 690
Packing Dimensions (W/H/D) inch
21 1/4 | 9 7/16 | 27 3/16
Weight
18.30 lbs | 8.3 kg
Gross Weight
24.69 lbs | 11.2 kg
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