RAAL-requisite PDA-1a User Manual
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RAAL-requisite PDA-1a User Manual

Planar & dynamic headphone amplifier
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INTRODUCTION:
The PDA-1a amplifier is engineered to drive all types of
Planar and Dynamic headphones. True-Ribbon and 2Ω
low impedance headphones can also be properly driven
PDA-1a
when using our TI-1a (optional) Transformer Interface.
This includes output impedances ranging from 2 to 600
ohms.
PLANAR & DYNAMIC
The preferred sensitivity of classic headphones should be
HEADPHONE AMPLIFIER
in the range of 90dB to max 110dB in order to achieve
the declared pressure levels and an acceptable level of
side effects in the form of noise.
USER MANUAL
Sound quality and tone balance, at high levels, are not
reduced with headphones that are outside the
recommended sensitivity range but can cause certain
side effects that are not considered amplifier deficiencies
but limitations of the topology of phenomena that can be
seen in highly sensitive headphones over 110dB.
We sincerely appreciate your trust in our work and hope
you will benefit by a lifetime of beautiful music and joyful
ownership.
Cheers & Happy Listening,
Alex Radisavljevic
Danny McKinney

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Summary of Contents for RAAL-requisite PDA-1a

  • Page 1 INTRODUCTION: The PDA-1a amplifier is engineered to drive all types of Planar and Dynamic headphones. True-Ribbon and 2Ω low impedance headphones can also be properly driven PDA-1a when using our TI-1a (optional) Transformer Interface. This includes output impedances ranging from 2 to 600 ohms.

  • Page 2: What's In The Box

    Power Cable - 115VAC (North America) All other regions; User provided - locally sourced TI-1a (optional) REQUIRED Power Requirements: The PDA-1a is also suitable for True- Ribbon and Extremely Low-Impedance User Selectable Mains Voltage: 115VAC, 1A Slo-Blo Fuse, IEC cable provided (North America).
  • Page 3 TRUE-RIBBON CIRCUM-AURAL CA1 & EXTREME LOW-IMPEDANCE HEADPHONE CONNECTIONS INPUT INPUT RCA L/R XLR L/R INPUT INPUT CONVENTIONAL HEADPHONE OUTPUT TRUE-RIBBON CA-1a XLR L/R RCA L/R CIRCUM-AURAL OUTPUT OUTPUT AUDIO SOURCE HEADPHONES TRUE-RIBBON OPEN-BAFFLE SR1 HEADPHONE CONNECTIONS INPUT INPUT RCA L/R XLR L/R INPUT INPUT...

  • Page 4: Front Panel Features

    Front Panel Features: (left to right) 1) POWER SWITCH (illuminated): 4) OUTPUT ATTENUATION 2: ON (UP) - OFF (DOWN) If desired, the output level of HEADPHONE OUTPUT 2 can be attenuated by -5dB or -10dB. This is a useful 2) HEADPHONE OUTPUTS 1: feature if ever two headphones of different sensitivity 1 - 6.3mm TRS (female) are being used, at the same time, or if one listener...
  • Page 5 Rear Panel Connections: (left to right) 4) GROUNDING OPTIONS (2 ea): 1) RCA SINGLE-ENDED INPUT (2 each): 3-pin Female XLR (Right & Left) Right - Left Pin-1 Ground Pin-2 Positive Going Phase 2) XLR BALANCED INPUT (2 each): Pin-3 Negative Going Phase 3-pin Female XLR (Right &...

  • Page 6: Specifications

    SPECIFICATIONS: Input Impedance: 80k Ohm Input Sensitivity: 0.5V / 80k Ohm Load impedance: 2 - 600 Ohms (headphone output) U.S.A. Output Power: See Chart Frequency Response -3dB: 500mV/sine. 10Hz - 500kHz Danny McKinney Distortion: 0.2% @ 1kHz danny@raalrequisite.com Signal to noise: > 96dB Tel: 818-437-0779 Input Connectors (L/R): 3pin XLR (female) Balanced Pin-1 Ground...

  • Page 7: Limited 1-Year Warranty

    EQUIPMENT AND PROPERTY. This warranty is only made to the original purchaser and is not transferable. In the event of failure of a product under this warranty, RAAL-requisite will Customer Responsibilities: repair, at no charge, the product returned to its factory. RAAL-requisite may, at its option, replace the product in lieu of repair.
  • Page 8 Safety Safety cont... To prevent electric shock, do not use the plug with an extension cord, receptacle, or outlet unless blades can be fully inserted. Refer all ser vicing to qualified ser vice personnel. Service is required when the device has been damaged, including cord or plug If you don’t know how to install audio devices, damage, liquid has been spilled or objects...

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