RAAL-requisite HSA-1b User manual

INTRODUCTION:
HSA-1b
USER MANUAL
The HSA-1b Headphone & Speaker Amplifier provides Direct-
Drive amplification for True-Ribbon Earfield Monitor
headphones, hi-efficiency speakers, conventional dynamic and
planar magnetic headphones.
Primarily, the HSA-1b amplifier was designed to drive ribbon
based headphones (low impedance hence high current
demand). It can drive classic type headphones with impedances
in the 20 - 600Ωrange. The desirable sensitivity of the classical
type headphones should be in the range of 92-100dB so that the
declared sound pressure levels and acceptable s/n ratios could
be achieved.
Sound quality and tonal balance, which are of highest standard,
are not reduced when headphones outside of the recommended
sensitivity range are used, Signal to noise ratio is at a required
level and will never be compromised with any side effects which
could occur when high sensitivity (100dB and above)
headphones are used.
Input Options include: Single-Ended (unbalanced) RCA, True-
Balanced 3-pin XLR with 3-position DIP switch providing 0dB,
-6dB and -10dB input sensitivity.
The HSA-1b also includes a precision 24-step volume attenuator
for rock-solid left/right balance throughout entire dial range.
We sincerely appreciate your trust in our work, as evidenced by
your purchase, and hope you will benefit by a lifetime of
beautiful music and joyful ownership.
Happy Listening,
Alex Radisavljevic
Danny McKinney
HEADSET AND SPEAKER AMPLIFIER

(1) HSA-1a User Manual (this booklet)
(1) HSA-1b Headset & Speaker Amplifier
(1) Cable - Amp to Low Efficiency Headphone 4-Pin XLR
(1) Cable - “Y” type for running two ribbon headphones
(1) Cable - 115VAC Power (North America)
(2) Banana to Binding Post Adaptors (left/right pairs) for
Speaker Connection Flexibility
Flight Case - Carry On with Wheels and Retractable Handle.
Includes Hi-Quality Foam Lined Interior.
User Selectable Mains Voltage 115VAC & 3-Amp Fuse, IEC
cable provided (North America).
User Selectable Mains Voltage 230VAC & 1.6-Amp Fuse, user
provided local IEC cable.
Internally Set 100VAC Mains (Japan) & 2.5-Amp Fuse, user
provided local IEC cable
BEFORE TURNING ON AMP FOR THE FIRST TIME!!!
Be sure to check that the mains voltage selector switch
is set to the correct voltage. The switch is located at
the top, front, lefthand side. It is red colored and
labeled 110/220.
What’s In The Box:
Optional Equipment:
Loudspeakers are connected to the amplifier by 4mm
female connectors, located at the rear of the amplifier.
The connectors are colored black, which is the
negative (ground connection) and red which is positive
(plus connection) for each channel respectively.
The amplifier does not have a loudspeaker short circuit
protection. Wrongly connected or shorted speakers
output will damage the amplifier.
Power Requirements:
Speaker Output Connections:
Input Sensitivity Adjustment:
This amplifier features internal sensitivity adjustments
of the XLR inputs. This sensitivity is adjusted via dip
switches located on a small printed circuit board
located vertically on the input XLR board which
holds the female three way XLR connectors at the
rear of the amplifier. Factory setting is -6dB.

1) Power: On/Off
2) Headphone Select:
SR1 baffle-step compensation for SR1a headphones
HP select for driving conventional headphones
3) Output Select:
HP (Headphone) output to front panel jacks
SPK (Speaker) output to rear panel banana jacks
In this position, baffle-step compensation is disabled.
4) Input Select:
XLR Balanced 3-pin
RCA Single-Ended (unbalanced)
5) Volume:
24-step Attenuator
6) Ribbon Output XLR:
Female 4-pin XLR for driving Ribbon Headphones
Male to Male adaptor cable (provided) allows
connection to drive low-efficiency headphones
7) Conventional Output XLR:
M/XLR for dynamic and planar-magnetic headphones
8) Conventional Output 6.3mm stereo (1/4”) TRRS:
For dynamic and planar-magnetic headphones
Front Panel Features:

1) IEC Power Inlet:
Standard IEC connector
Fuse Holder
3A for 120V operation
1.6A for 230V operation
2.5A for100V (Japan) operation
2) RCA audio input:
Single-Ended unbalanced analog input
3) XLR audio input:
3-pin XLR balanced analog input
Pin 1 Ground
Pin 2 Positive going phase
Pin 3 Negative going phase
4) Speaker Outputs:
Banana speaker connections (4)
Binding Post adaptors provided (4)
Type to enter text
Rear Panel Connections:

SPECIFICATIONS:
IMPORTANT NOTICE: The amplifier does not have loudspeaker
short circuit protection. Short circuit protection degrades sound
quality, hence it is not used. Wrongly connected or shorted speakers
output will damage the amplifier.
Load impedance: 0.3ohm – infinity on headphone output connectors.
Output power (one channel driven): 10W/8Ω, 20W/4Ω, 40W/2Ω
"""" 55W/1Ω@ 1kHz/sine wave
Frequency Response: 100mv/ in/sin. 15Hz – 500kHz
Power bandwidth: 100kHz (-3db) at 1W
Distortion: < 0.5% at 1kHz
Signal to noise: better than 90db
Input impedance: 40k Ω
Sensitivity: 0.5V /40k Ω
Input connectors: INPUT 1- 2 RCA, INPUT 2 - 2 XLR 3pin (female)
Output connectors: 1 x XLR 4-pin male (true-ribbon headphones)
1x XLR 4pin – female and 6.3mm stereo jack (conventional
headphones) 20 - 600Ω
Max power consumption: 150W, without signal 25W
Working voltage: 115V/230VAC (selector switch)
# # 100V (requires internal connection)
Dimensions: Height 90mm, Width 218mm, Depth 320mm
#Height 3.54 in, Width 8.58 in, Depth 12.60 in
Weight net: 5.3kg / 11.70 lbs.
Europe
Aleksandar Radisavljevic
ale[email protected]
Tel: [phone]
Djordja Simeonovica 4
19000 Zajecar
Serbia
U.S.A.
Danny McKinney
[e-mail]
Tel: [phone]
2175 Goodyear Avenue
Suite 110
Ventura, California 93003

RAAL-requisite warrants its products to be free from defects in material and
workmanship under normal use and service for a period of five (5) years from
the date of delivery.
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
repair, at no charge, the product returned to its factory. RAAL-requisite may, at
its option, replace the product in lieu of repair. If the failure has been caused by
misuse, neglect, accident or abnormal operating conditions, repairs will be
billed at the normal shop rate. In such cases, an estimate will be submitted
before work is started, if requested by the customer.
ALL OTHER WARRANTIES ARE HEREBY DISCLAIMED.
This warranty does not cover:
1. normal wear and tear or normal aging of the product;
2. cosmetic damage, including but not limited to scratches and dents;
3. damage through accident, abuse, neglect, misuse, natural events, or other
external causes;
4. damage through misapplication, overloading, or improper usage;
5. damage due to improper maintenance and repair;
6. damage as a result from the shipping and handling by third parties; or
7. product alterations.
Limitation of Liability:
EXCEPT AS PROVIDED IN THIS WARRANTY AND TO THE MAXIMUM EXTENT
PERMITTED BY LAW, RAAL-REQUISITE IS NOT RESPONSIBLE FOR ANY
DIRECT, INCIDENTAL OR CONSEQUENTIAL DAMAGES OR INJURIES
RESULTING FROM ANY BREACH OF WARRANTY OR CONDITION,
INCLUDING BUT NOT LIMITED TO LOSS OF USE; LOSS OF REVENUE; LOSS
OF ACTUAL OR ANTICIPATED PROFITS; LOSS OF BUSINESS; LOSS OF
OPPORTUNITY; LOSS OF GOODWILL; LOSS OF REPUTATION; OR ANY
DIRECT OR INDIRECT OR CONSEQUENTIAL LOSS OR DAMAGE
WHATSOEVER CAUSED INCLUDING THE REPLACEMENT OF EQUIPMENT
AND PROPERTY.
Limited 5-year Warranty cont...Limited 5-Year Warranty:
Customer Responsibilities:
Customers may be required to provide proof of purchase date, respond to
questions designed to assist with diagnosing potential issues and follow RAAL-
requisite’s directions to make a claim on your warranty. DO NOT OPEN THE
PRODUCT. OPENING THE PRODUCT MAY VOID YOUR WARRANTY. To make
a warranty claim:
1. Contact us either through:
phone: [phone]
email: [e-mail]
office: 2175 Goodyear Ave, STE 110. Ventura CA. 93003-7761
RAAL-requisite's Responsibilities:
1. We will try to assist you in operating or repairing your product.
2. If we determine a replacement part is necessary, we will send you a free
replacement part.
3. If we determine a replacement will not resolve your problem, we may ask
you to return your product to our warehouse. Upon receiving the product at
our warehouse, RAAL-requisite will inspect the product.
4. If we determine that the product has a manufacturing defect we will send
you a replacement part. If replacement of the part or repair of the unit is not
possible, RAAL-requisite will send you a replacement product.
5. Customers who purchased the product from a third-party vendor are not
eligible for a refund from RAAL-requisite.
RAAL-REQUISITE SHALL HAVE THE EXCLUSIVE RIGHT TO DETERMINE IF A
UNIT IS COVERED UNDER ITS WARRANTY POLICY. Severability:
The invalidity, illegality or un-enforceability of any provision of this warranty
shall not render the other provisions invalid, illegal or unenforceable.
Governing Law and Jurisdiction:
This warranty shall be governed by the laws of the State of California. The
courts of California shall have the exclusive right to adjudicate any disputes
arising under or in connection to this warranty.

1.If you don’t know how to install audio devices,
get a qualified professional to help.
2.Never use this device near water, and clean
only with a dry cloth.
3. Assure adequate ventilation, do not block any
ventilation openings, or place near heat
sources.
4. Use only the supplied power cord or suitable
replacement. Route cords away from traffic
areas and protect them from being pinched.
Unplug the cord from the outlet if the
apparatus is unused for a long period of time.
Safety:
5. To prevent electric shock, do not use the plug
with an extension cord, receptacle, or outlet
unless blades can be fully inserted.
6. Refer all servicing to qualified service
personnel. Service is required when the device
has been damaged, including cord or plug
damage, liquid has been spilled or objects
have fallen into the device, the device has
been exposed to rain or moisture,
does not operate normally, or has been
dropped.
WARNING:
TO REDUCE THE RISK OF FIRE OR
ELECTRIC SHOCK, DO NOT EXPOSE THIS
DEVICE TO RAIN OR MOISTURE.
Safety cont...