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Articles May-June 2021

Pursuing the Pro Audio Trail

In conversation with Caroline Moss and Sue Gould

PT got in touch with the Pro AVL Asia magazine core team of Editor - Caroline Moss and Sales Director - Sue Gould, who between them boast of over three decades of experience in the pro audio industry..... read more

NJSM Marks a Milestone in the Business of Sound

From Rental Company to manufacturer and innovator, Nixon Johnny has guided and grown NJSM from a two-person company to a fifty-person company, continuing to expand into virtual events with NJSM Virtual Studio..... read more

Tech Savvy Environment for T-Systems

Eyte Technologies installs high-tech AV Solution at T-System’s Experience Center facilitating brand value and delivering superior customer experience..... read more

Conversations with SudeepAudio

Sudeep Audio, one of India’s first pro audio web store selling studio software and equipment online commenced its YouTube Channel, ConverSAtions, in 2011 to share the journey of Indian Sound Engineers..... read more

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Stage Microphones

Spotlight on Stage Microphones launched in 2019

Ahuja Pro Series

PRO+ 7500du

PRO+ 7500du is a most elegant and durable Live Stage Performance Microphone with TWO CARTRIDGES for good distance pick-up. High sensitivity and supercardioid pattern makes it ideal for Live Stage Performances, as well as Vocal and Choir applications.


Main features include:

  • Built-in dual high sensitivity cartridges for excellent distance pick-up.
  • Cartridges are effectively shock mounted to reduce handling noises.
  • Slide potentiometer for smooth and noiseless ON/OFF operation.
  • Supercardioid polar pattern for obtaining higher gain before feedback.
  • Unique hinge design for angle adjustment - forward 30° and backward 45°.
  • Rugged zinc die-cast body in classic design.

Technical Specifications:

  • Mic Type: Dynamic
  • Polar Pattern: Supercardioid
  • Impedance: 1.2k OHM
  • Frequency Response: 50-15,000Hz
  • Sensitivity: 5mV/Pa
  • Switch: ON/OFF Slide Potentiometer Switch


Ahuja PRO+3400 is a premium microphone for the most demanding high end applications.

Main features include:

  • Large diameter diaphragm for more sound pickup and better sensitivity.
  • Supercardioid directional pattern to reduce feedback and allow more volume opening.
  • Hum-bucking coil on the transducer to reduce hum and electrical noise pickup.
  • Excellently adjusted proximity effect without distortion.
  • Superb shock mount system for the transducer, to avoid handling noises.
  • Wide frequency response to cover all speech and music applications.
  • Ideal for all Vocal and PA applications..

Technical Specifications:

  • Mic Type: Dynamic
  • Polar Pattern: Supercardioid
  • Frequency Response: 40-16,000Hz
  • Impedance: 350W
  • Sensitivity: 3.15mV/Pa
  • Switch: High Quality Magnetic On/Off Switch for noise-free switching
  • Cable: 10 mtrs. twin core shielded low noise with 3 pin XLR connector & metal 6.3mm phone plug
  • Body: Zinc die-cast in attractive finish

Aston – Stealth

The Aston Stealth is a revolutionary, broadcast quality microphone for studio and stage. With 4 switchable voices delivering unparalleled performance in almost any situation, a Class A built in mic preamp with autodetect 48V Phantom power and featuring a unique Sorbothane internal shock mount system.

Main features include:

  • Active & Passive modes with 48V Autodetect function
  • Built-in Class A preamp increases mic sensitivity in active mode (requires phantom power)
  • Auto-detects 48-volt phantom power to engage active mode
  • 4 different settings: 2 vocal, 1 Guitar, and 1 Dark
  • Internal Sorbothane shockmount minimizes low-end rumble
  • Includes quick-release mic stand mount
  • Purple LED phantom power indicator can be disabled for Stealth mode
  • Capsule is enclosed in a stainless steel Faraday cage for maximum interference rejection
  • Eco-friendly packaging which is protective, and re-useable.

Technical Specifications:

  • Transducer Type: Moving coil
  • Directional Polar Pattern: Cardioid
  • Frequency Response: 20Hz – 20kHz (+/-3dB)
  • Equivalent Self Noise Level: 10dB A-weighted
  • Sensitivity at 1kHz into 1kohm - passive mode: Average 1 mV/Pa (varies across 4 voices)
  • Sensitivity at 1kHz into 1kohm - active mode: Average 150 mV/Pa (varies across 4 voices)
  • Maximum SPL for THD 0.5%: 140dB
  • Product length: 196 mm / 7.72 in
  • Product width: 58 mm / 2.28 in
  • Product weight: 692 g / 1.52 lb

DPA – 2028 Vocal Microphone

The 2028 Vocal Microphone is designed for the unique challenges of live stage performances. It is a flexible handheld vocal mic, which provides transparent, fantastic vocals to performers from a wide range of markets including live, HoW, broadcast, etc. 

Main Features include:

  • Renowned DPA sound
  • Natural vocals – from folk to metal
  • Reduces feedback issues
  • Rugged enough for the live stage
  • Uniform supercardioid directionality
  • Extreme SPL handling
  • Flat off-axis response
  • Wired DPA handle with standard XLR output

Technical Specifications:

  • Directional Pattern: Supercardioid
  • Principle of operation: Pressure gradient
  • Cartridge type: Pre-polarized condenser
  • Effective frequency response: 20 Hz - 20 kHz
  • Frequency range, ±2 dB, at 12 cm (4.7 in): 100 Hz - 16 kHz. Permanent 3rd order low-cut filter at 80 Hz
  • Sensitivity, nominal, ±3 dB at 1 kHz: 5 mV/Pa; -46 dB re. 1 V/Pa
  • Equivalent noise level, A-weighted: Typ. 22 dB(A) re. 20 µPa (max. 23dB(A))
  • Distortion, THD < 1% : 136 dB SPL RMS, 139 dB SPL peak
  • Dynamic range: Typ. 117 dB
  • SPL, THD 10% : 160 dB SPL peak
  • Rated output impedance: 150 Ω
  • Minimum load impedance: 1 kΩ
  • Cable drive capability: 100 m (328 ft)
  • Output balance principle: Impedance balancing with Active Drive
  • Common mode rejection ratio (CMRR): > 50 dB at 1 kHz
  • Power supply (for full performance): 48 V Phantom power (±4 V)
  • Current consumption: Max 2.5 mA
  • Connector: XLR-3M. Pin 1: shield, Pin 2: signal + phase, Pin 3: - phase
  • Weight: 286 g (10.1 oz)
  • Diameter: 48 mm (1.9 in)
  • Capsule diameter: 19 mm (0.75 in)
  • Microphone length: 188 mm (7.4 in)
  • Maximum output voltage, RMS: 9 Vrms; 19 dBV; 28 dBu
  • Polarity: +V at pin 2 for positive sound pressure

Earthworks – SR314

The Earthworks SR314 is a handheld condenser microphone designed to meet the expectations of a live performance environment. By systematically eliminating the many layers of distortion and noise normally added by each acoustic and electronic component, the Earthworks SR314 pulls back the veil to reveal the true voice of the artist.

Main Features include:

  • Small diaphragm cardioid condenser capsule
  • Class A amplifier circuit
  • Extended flat frequency response from 20Hz-30kHz
  • Tight cardioid polar pattern with consistent frequency response to 90º off-axis
  • 145dB SPL handling
  • Includes MC4 microphone clip and storage bag
  • Maximum rejection of sound sources at 180 degrees
  • Stainless Steel Chassis

Technical Specifications:

  • Frequency Response: 20Hz – 30kHz
  • Polar Pattern: Cardioid
  • Sensitivity: 10mV/Pa (-40dBV/Pa)
  • Power Requirements: 24-48V Phantom, 10mA
  • Max Acoustic Input: 145dB SPL
  • Signal-to-Noise Ratio: 79dB A-weighted
  • Output: XLR (pin 2+)
  • Output Impedance: 65Ω balanced (between pins 2 & 3)
  • Min Output Load: 600Ω between pins 2 & 3
  • Noise: 15dB SPL equivalent (A weighted)
  • Dimensions (L x D): 181.1mm x 40.6mm (7.13 x 1.60 inches)
  • Weight: 1.5 lb. (.68kg)

Electro Voice – RE520

The RE520 is a premium-grade, high-performance, condenser supercardioid vocal microphone. Designed to reveal the exceptional detail and vivid clarity synonymous with condenser elements, it elegantly delivers the lyrical finesse required for expressive vocal performances, while controlling off-axis sound from near-by sources..

Main Features include:

  • Premium condenser element delivers a highly detailed, full, and vivid sound
  • Supercardioid polar pattern provides excellent acoustic isolation and feedback control
  • Multi-stage pop filter minimizes breath blasts and plosives
  • Selectable high-pass filter reduces undesirable low frequency content when engaged
  • Vibration-absorbing internal shock mount minimizes handling noise
  • Internal 150Hz highpass (bass roll-off) switch
  • Vivid, full-bodied sound (40Hz–20kHz)
  • Zinc diecast body with black polyurethane paint and steel wire cloth grille

Technical Specifications:

  • Element type: Self-biased condenser
  • Frequency response: 40 Hz-20 kHz
  • Polar pattern: Supercardioid
  • Sensitivity, open circuitvoltage: @ 1 kHz: 5.6 mV/Pascal (-45 dBV/Pa)
  • Clipping (max SPL): 150 dB SPL (1% THD)
  • Self noise: 17 dB SPL “A” weighed (0 dB=20 μPa) Dynamic range: 133 dB
  • Signal-to-Noise ratio: 77 dB
  • Output impedance: 200 ohms
  • Power requirements: 48 VDC phantom power
  • Polarity: Positive pressure on diaphragm produces positive voltage on pin 2 relative to pin 3
  • Electrical contact: 3-pin, XLR-type
  • Finish: Black polyurethane paint
  • Materials: Zinc die cast, steel wire cloth grille
  • Dimensions, length: 7.6 in. (192 mm)
  • Diameter: 1.95 in. (49.5 mm)
  • Shank: 0.96 in. (24.3 mm)
  • Net weight: 11.7 oz (332 g)
  • Shipping weight: 1 lb 5.1 oz (598 g)