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A.C. Power Inrush Suppressors
Inrush suppressors limit current inrush when the amplifier turns on,
which eliminates current surge conditions that may open fuses or trip
house circuit breakers.
Quick-Acting Protection Circuitry
Protection circuitry reacts very quickly to DC and VLF (very-low
frequencies) at amplifier inputs as well as over-current conditions at
amplifier outputs. Some multi-zone controllers become unstable with
power line fluctuations and send DC offset to the external amplifier.
The Sonamp 1250 MKII detects this and lifts the output connections to
protect the speakers.
Infrasonic Filtering on Bus Inputs
Low-frequency filtering is provided on the bus inputs (left, right and
aux) to protect volume controls and reduce power usage. Since bus
inputs are mostly used for distributed audio, infrasonic filtering (below
15Hz) protects transformer-based in-wall volume controls
without degrading the audio signal.
Ultrasonic Filtering on Bus Inputs
Gentle high frequency rolloff above 20kHz is provided on the bus inputs
(left, right, and aux) to protect tweeters from ultrasonic signals and
prevent tweeter burn out.
Improved Speaker Binding Posts
Wire entry on the binding posts has been rotated 45 degrees for easier
access during speaker hookup.
Flush-Mount Volume Controls
The screwdriver-adjustable volume controls can be hidden with foil
tape to deter tampering with level settings.
Large gold feet
Taller feet provide better cooling characteristics while a smoother glide sur-
face allows for better control when moving the amplifier on flat surfaces.
INTRODUCTION
From the gold-plated input jacks to the low-noise multi-tap
torroidal power transformer, to the discrete high-power output transis-
tors, this amplifier is designed to satisfy the requirements of the most
demanding home and commercial installations. Every part of the
Sonamp 1250 MKII contributes to reliable and transparent, uncolored
audio reproduction.
Using Additional Amplifiers
If additional 1250 MKII amplifiers are used, we recommend separate 15-
amp circuits for each amplifier due to the enormous power capability
and requirements of this product. The provided non-buffered Line Out
connections for left, right, and auxiliary channels facilitate easy connec-
tion of multiple amplifiers. Within the limits of available mains power,
any number of additional Sonamp 1250 MKII amplifiers may be daisy-
chained for larger installations.
Associated Components
Your Sonamp 1250 MKII should be used with other components of the
highest caliber. The Sonamp 1250 MKII is compatible with most
high-quality preamplifiers, tuners, CD/DVD players, etc; as well as
better in-wall and cabinet speakers from Sonance and other reputable
manufacturers.
Care and Maintenance
Retain these safety and operating instructions for future reference.
1. Follow all warnings and instructions in this manual and marked on
the product.
2.Any service or repair required must be performed by
qualified, factory authorized personnel.
3. To clean your Sonamp 1250 MKII, use a soft brush, “canned air,” or
wipe the exterior surfaces with a damp cloth. Never use any cleaners
or solvents.
4. If the electrical(“)39.5(canned aif11.1(i)e)2..2(subject t)9.7(o)0( fr)11.es, spikes, and
brownouts, a power conditioner designed for use with high-fidelity
2quipment should be employed to protect the Sonamp 1250MKII.
System Configuration
The flexibility ofcanthe Sonamp 1250 MKII provides the installer
with many different connection options, so to avoid errors you should
car you actually begin connecting
components.
Begin by drawing a diagram of the system similar to the examples in this
manual. Plan all of the system’s settings and connections to achiev your
objective.Verify that you have all of the parts and tools rquired for the
installation:
• High-fidelity interconnect cables such as Sonance MediaLinQ Silver
OFC Intrconnects.
• Speaker wires. These may be unterminated (bare wire at
connections) or spade, banana, or pin termination. Gold-plated
connectors are preferred to resist oxidation.
• LS1 and LR1 balanced line-level(“)nder and receiver (optional). If the
amplifier..2(plac)10.6(e)-2.3(d mor)11.6(e)-0.3( than 20 feet fr)13.5(om the sour)11.6(c)10.6(e)-0.3( or pr)11.6(eamplifier)55.5(,)]TJT*0.1164 Tw[(the LS1 and LR1 pr)13.7(o)10.8(v)-15(ide a wa)16.6(y t)9.5(o)-0.2( send lo)14.6(w-le)-7.1(v)15.8(e)-2.2(l(audio sig)-11.2(nals long )]TJT*-0.0247 Tc0.1235 Tw[(distanc)10.3(es in close pr)13.3(o)26.3(ximit)-13.6(y t)9.1(o)-0.6( sour)11.3(c)10.3(es of)-359.4(noise int)8.1(erfer)11.3(enc)10.3(e)-0.7( w)-16.6(i)-0.5(thout)]TJT*-0.0051 Tc0.4952 Tw[(int)-6.2(r)13.7(o)-3.1(ducing noise or hig)-12.3(h fr)11.7)2quency roll-off to the signal.
(See Fig. 6 for example.)
INSTALLATION
Unpacking
Sav the cartn and polyst yrene inserts for future safe transport in case
the amplifier..2(mo)10.5(v)15.6(e)-2.4(d or r)11.5(e)-2.4(quir)11.5(es shipping for r)11.5(e)0.6(pair)55.4(.)]TJ0 -1.7778 TD-0.0234 Tc0.0024 Tw[(Bef)3.6(o)3.7(r)12.6(e)0.7( p)3.6(r)14.6(oc)11.6(eeding w)-15.2(ith installatio)3.5(n,)-178.7(lo)]TJ14.3038 0 TD-0.0224 Tc0.0031 Tw[(cat)10.4(e the se)4.6(r)-9.3(ial n)8.5(u)1.7rear
panel of the unit and note it here for future reference :
S/N:_________________________________________
Placement
CAUTION: Do not attempt to lift the Sonamp 1250 MKII
without assistance. Improper.lifting of this 54lb. unit can cause
personal injury.