Kingrex SLAP User Manual

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ANUAL

ANUAL

Table of Content

A. Content
B. Introduction
C. Specification
D. Design Consideration of KingRex SLAP
E. Important safety instruction
F. Safety caution
G. Operation environment presentation

G.1 Front panel
G.2 Rear panel

H. Installation
H.1 Inspection
H.2 Placement
H.3 Battery charging
H.4 Connect the loads

I. Operating method

I.1 Switch on
I.2 Battery replacement

J. Troubleshooting
K. Storage
L. Maintenance
M. Service
N. Our best wishes

Content

SLAP*1
DC cord * 1
AC cord * 1
User manual * 1
Warranty card *1

Introduction

SLAP is designed with automatic monitoring by TI UC3906IC which is a SLA battery charger controller. It is
using 3 stage charging management to prevent overcharging and this design could extend the life of SLA
battery.
The LED indicator of front panel could show all charging and discharging stage at PSU on mode. The front
LED indicator could start monitoring the charging stage. If the "PSU OFF", the charging process is still
working but it can not be show the monitoring status through the LED as it won't light

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Specification

Rated input voltage AC 90~260V, 47~67Hz

Battery type 12 volt nominal SLA

Battery size 12V/7Ah

Charging current 80mA~ 750mA

Charging type Lead Acid Chemistry

Constant current/ constant voltage/float

Stage 1: current 750mA

Stage 2: current 400mA

Charging current

Weight

Cooling Natural convection, no fan

Protections AC input fuse, DC output fuse

MTBF 30,000 hours by MIL-STD calculation

LED Indications

Stage 3: float charge current 200~400mA

“Charged” light turns on and float charge starts when the

charge current is approx 80mA when the battery charge

voltage is above 14 volts.

Charging Red

Charged Green

In use Green

Battery low Red & green blinking

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Design consideration of KingRex SLAP

Design consideration for the KingRex SLAP

The slightest demand, the greatest satisfaction

After introduction of the T20 series audio amplifier to the public, KingRex sought the next evolutionary step in
sonic excellence while preserving the existing value for our customers. Currently we provide two power supply
solutions for our T 20 series amplifiers, a power adaptor(switching type) and a power supply unit – PSU (linear
power type). We believe these two products match most audiophile demands because of their reasonable price and
excellent quality but also they sound good. Nevertheless, to satisfy the highest level of audiophile expectation for
low noise and distortion, we have developed a pure power source – the SLAP (Sealed Lead-Acid battery power
supply unit)

What are the differences between switching power, linear power, and battery power?

All amplifiers need a continuous current supply during operation. If the demands of the amplifier exceed the
capabilities of the power of the power supply during transient conditions deep bass passages then detail loss,
smearing and distortion can occur. The three most common power sources: switching power adaptor, linear
power supply, and battery power supply unit.
The switching power adaptor is the most convenient and common power source however it is not a good
selection for the music connoisseur who prefers sonic performance over convenience as it has the most noise
and distribution due to the high-frequency switching and harmonics in its design.
The linear power supply is a better choice for audiophiles. It has less noise and distortion than the switching
power adaptor, however, during the AC to DC conversion and rectification process, there is still minute amounts
of unavoidable noise and distortion. That’s because the AC power is required to traverse significant circuitry
such as transformer, diodes, voltage regulators, and other components.
To eliminate any potential for noise during the rectification and filtering process we have eliminated it
(during operation) and created the SLAP.

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Why the SLAP(battery power) is better than a PSU(linear power supply)?

Pure DC is the best power source for the Hi End audio equipment. However, it is difficult to provide pure DC for
high watt power amplifiers as the large capacitor (battery) size required to meet the transient and bass demands
require careful design considerations for practical use consideration.
The power voltage and current supply is very important for operating the power amp which if not properly
designed, will affect the sonic performance directly.
The output stage of a power amplifier during peak power operation will draw a instantaneous high current from
the DC voltage rails. DC voltage is supplied by the rectifier diodes, which convert AC to DC, to and through the
filtering capacitors, which smooth the ripple voltage and also act as a power reservoir. Performance of the power
supply largely depends on the capacity of these components. When the output power of the amp is relatively low,
the demand on the current is small and steady, the supply will be stable and will not deteriorate. When the output
power is relatively high, more DC current will be drawn from the capacitors, putting a strain on the rectifier diodes
and causing AC ripple voltage. When a ripple voltage exists, it will cut short the recharging time of the capacitors
and develop a 120Hz pulse noise that in turn interfere the output stage transistors, inducing distortion within the
audible frequencies. The best solution to overcome this is by adopting a power supply capable of extremely large
current(probably 5 to 10 times of what is required to meet normal demand) and very large capacitors to sustain the
supply. Under such circumstances, a reliable battery power supply can fulfill the dual role of large current and large
capacitor.
The battery power supply provides the required current for operation while maintaining a very large reserve for
transient and bass heavy passages. The SLAP uses YUASA NP7-12 (12V/7AH) sealed lead-acid battery which has
a maximum output of 105A w/o pulse noise which is a very good match for the under 20 Watt output of Class T or
Class D amplifiers.

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