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Leeds HIZ PRE User manual

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User’s manual
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User’s manual
Revision 1
2009, Leeds Technology LLC
All rights reserved.
HiZ Pre Limited Warranty
Leeds Pro Audio warrants this product to be free of defects in material and
workmanship for a period of three year from date of original retail purchase.
This warranty is enforceable only by the registered owner of the product
identified by the product serial number. To be protected by this warranty, the
purchaser must complete and return the enclosed warranty registration card
within 14 days of purchase or complete the on line at:
http://www.leedsproaudio.com/15101.html. During the warranty period, Leeds
Pro Audio shall at its sole and absolute option, either repair or replace, free of
charge, any product that proves to be defective on inspection by Leeds Pro
Audio or its authorized service representative. To obtain warranty service, the
purchaser must first email or write Leeds Pro Audio at the email or address
printed below to obtain a Return Authorization Number and instructions of
where to return the unit for service. All inquiries must be accompanied by a
description of the problem. All authorized returns must be sent to the Leeds
Pro Audio repair facility postage pre-paid, insured and properly packaged.
Leeds Pro Audio reserves the right to update any unit returned for repair.
Leeds Pro Audio reserves the right to change or improve the design of the
product at any time without prior notice. This warranty does not cover claims
for damage due to abuse, neglect, alteration or attempted repair by
unauthorized personnel, and is limited to failures arising during normal use
that are due to defects in material or workmanship in the product. Any implied
warranties, including implied warranties of merchantability and fitness for a
particular purpose, are limited in duration to the length of this limited warranty.
Some states do not allow limitations on how long an implied warranty lasts, so
the above limitation may not apply to you. In no event will Leeds Pro Audio be
liable for the incidental, consequential or other damages resulting from the
breach of any express or implied warranty, including, among other things,
damage to property, damage based on inconvenience or on loss of use of the
product, and, to the extent permitted by law, damages for personal injury.
Some states do not allow the exclusion of limitation of incidental or
consequential damages, so the above limitation or exclusion may not apply to
you. This warranty only applies to products sold and used in the United State
of America. For warranty information in all other countries please refer to your
local distributor.
Leeds Technology LLC
7053 Lake Island Drive
Lake Worth, FL 33467
warranty@leedsproaudio.com
2009, Leeds Technology LLC. All rights reserved.
___________TABLE OF CONTENTS
1 Overview
1.1 Introduction 4
1.2 Features 5
2 Controls & Connections
2.1 Front Panel 6
2.2 Back Panel 7
2.3 Connection Diagram 8
3 Operation
3.1 Overview 9
3.2 Instrument Input 9
3.3 Clip Indicator 9
3.4 Equalizer 9
3.5 Output Level 10
3.6 Vacuum Tubes 10
3.7 Power Supply 11
3.8 Mounting Instructions 12
3.9 Interference 12
4 Technical
4.1 Audio Specifications 13
4.2 Input Specifications 13
4.3 Output Specifications 13
4.4 Power Specifications 13
4.5 Physical Specifications 13
5 Miscellaneous
5.1 Information 14
5.2 Notes 14
__________________
______________________
3
1. OVERVIEW________________
1.1 Introduction
Thank you for purchasing the HiZ Pre Acoustic Instrument
Tube Preamp - EQ - Active D.I. The HiZ Pre is a vacuum tube
driven active direct box with a superb equalizer to craft your
sound. The ultra high input impedance preserves the full
bandwidth and bass response of a piezo element pick up. Our
negative feedback voltage amplifier design provides a very low
noise floor and wide bandwidth to ensure accurate
reproduction of your instrument’s timbre. The buffered outputs
allow you to simultaneously drive your mixer/console and
stage amplifier without loss of signal clarity. The road ready
rugged heavy gauge steel chassis is rack mountable for your
instrument case or studio rack. This pre-amp was designed
using state of the art components to provide a clean, yet warm
tube sound. Please contact us at support@leedsproaudio.com
with your questions or comments regarding this product.
Leeds Pro Audio welcomes the comments of our customers.
We appreciate the support you have shown us through the
purchases of this product.
Please pay close attention to how you connect your HiZ Pre to
your system. Improper grounding is the most common cause
of noise problems found in studio or live sound systems. We
recommend you to read this manual to familiarize your self
with this product.
Enjoy your HiZ Pre
__________________
______________________
4
____________________OVERVIEW
1. Features
The following is a summary of your HiZ Pre features:
Ultra-high input impedance input stage
The ultra high input impedance provides a very low noise floor
and preserves the full bandwidth and bass response of a piezo
element pick up.
12AX7 vacuum tube for warm harmonically rich sound
Our negative feedback voltage amplifier design provides a
very low noise floor and wide bandwidth to ensure accurate
reproduction of your instrument’s timbre.
2 band Baxandall type shelving equalizer
The shelving equalizer enables ultra clean +/- 20 dB boost or
cuts of treble and bass frequencies.
Balanced XLR output, Unbalanced ¼” buffered output
The buffered output allows you to simultaneously drive a stage
amplifier and a balanced XLR input on your console or mixer
without loss of signal quality.
Rugged Road Ready Construction
The HiZ Pre is constructed of heavy duty 16 gauge steel. The
chassis is finished in a scratch resistant, textured powder
coating designed to combine an elegant look that withstands
the wear and tear of a working musician. The HiZ Pre is rack
mountable for your instrument case or studio rack.
__________________
______________________
5
2. CONTROLS & CONNECTIONS
.1 Front Panel
Hi Z input – High impedance input matched to piezo electric
elements such as under saddle and soundboard transducers.
Bass – Sets low frequency shelving equalizer gain to +/- 20dB.
Treble – Sets high frequency shelving equalizer gain to +/-
20dB.
Clip – Monitors the instrument input and indicates if the input is
being driven with a signal that is too hot. The clip indicator has
been finely tuned to illuminate when the input signal level
reaches an amplitude that may cause an increase in harmonic
distortion of the output of the HiZ Pre.
Volume – Sets the output level. Ideally
Power – Power switch and indicator.
__________________
______________________
6
_____CONTROLS & CONNECTIONS
.1 Rear Panel
Unbalanced output – Buffered ¼ inch output to drive a monitor
or stage amplifier. The buffer allows both the 1/4 and XLR
outputs to be used simultaneously without loading down the
output stage of the HiZ Pre. Cable Wiring:
TIP SIGNAL (+)
SLEEVE GROUND (-)
Balanced Output – XLR output to couple to a console or mixer.
Use this for highest quality sound and for long cable runs
(through a stage snake for example). Cable Wiring:
PIN 1 GROUND
PIN 2 SIGNAL (+)
PIN 3 SIGNAL (-)
Power Jack – Connect the 16VAC, 1000mA wall transformer.
__________________
______________________
7
CONTROLS & CONNECTIONS_____
.3 Connection Diagram
__________________
______________________
8
HiZ Input
XLR
balanced
output
¼” Un-
balanced
output
HiZ Pre
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Tube Preamp - EQ - Active D.I.
Mixer /
Console
Amplifier
Power
Supply
Guitar
w/ piezo
pickup
16VAC
1000mA
3. OPERATION_______________
3.1 Overview
In summary, ensure you do not overdrive the HiZ Pre input.
EQ and maximize the HiZ Pre Volume while minimizing the
input level on the mixer, console, or amplifier.
3. Instrument Input
The instrument input is designed to accommodate a ¼” tip and
sleeve plug from instruments such as acoustic electric guitars
and basses. This instrument input is an ultra high impedance
amplifier designed to allow the full frequency bandwidth of an
acoustic piezo element instrument pickup to be realized. Care
should be taken not to overdrive this input with instruments
that have their own preamplifiers. Ideally, the HiZ Pre is to be
connected directly to the piezo pickup.
3.3 Clip Indicator
This is particularly useful for instruments which have an
integral battery powered pre-amplifier. Turn the pre-amplifier
gain to a level when the clip light momentarily blinks when the
guitar is strummed just a bit louder than the musician’s playing
style. This will optimize the signal strength entering the HiZ
Pre, allowing the user to not overdrive the HiZ input.
3.4 Equalizer
The shelving equalizer is controlled with the Treble and Bass
knobs to boost or cut high and/or low frequencies +/-20dB.
The “0” at the 12 o’clock position is flat or 0dB gain.
________________
_________________________
9