The question of amplifier power is not easily
«answered without reference to a particular listen
ing environment. Less than fifty watts per channel
Into 4 ohms will rarely provide sufficient power to
provide optimum performance in an average room,
and two hundred watts may sometimes be inade
quate in a largo/oom at very high levels. The Type
A can comfortably handle many hundreds of watts
of clean power on good source material with no
signs of strain. For the widest possible dynamic
range, bi-ampliflcation is recommended. On the
other hand, an improperly used 50 watts per chan
nel amplifier can possibly be överdriver» into
damaging your Type A's. Turn-on transients, the
disconnection of audio cables during the use of
the system and acoustic feedback can cause
damage. Volume controls should be set close to
the minimum when tone arms are cued or radio
stations are tuned, as these may produce dan
gerous transients as well.
Fuses
Every driver on thp Type A Is individually
fused. These fuses will protect the Type A from
most forms of abuse but are not infallible. If a fuse
blows, Ihe driver which it protects will cease to
operate and the speaker will evidence a severe
lack of bass, midrange or treble.
Fuses should be replaced with the exaqt value
and type supplied. Use of slow blow fuses or val
ues higher than those recommended will Invali
date the warranty.
Woof or 3 arnpcro (Buss AGC 3 of Utlolfyse 3AG 3A)
MidrnnQG 2V> ompore (Buss AGC 2V> of lltlnliuae 3AG 2'/»A)
Twenler 2 ampere (Buss AGC 2 or Littnltiise 3AG 2A>
If a fuse blows, the speaker has been sub
jected to excessively higtj power levels, and the
volume should be reduced somewhat. If a fuse
continues to blow at lower volume settings, check
the condition of your electronics.
Problems
If your audio system Is malfunctioning, check
the speaker's fuses, the jumper cable, and the
connections at the speaker’s input. If one of the
three fuses Is blown, it will produce a very notice
able lack of bass, midrange, or treble. See the
section on fuses.
If only one channel Is malfunctioning, you
can determine If It is the speaker or If it is else
where in the audio system by switching the input
wire from the back of speaker A to speaker B and
vice versa. If the same speaker still sounds faulty,
it is most likely the source of the trouble. Alter
natively. if it Is hard to switch the wires between
speakers, you can make the exchange between
channels at the back of the amplifier. If the same
speaker sounds faulty, then it is likely that either
the cable connecting your speaker and amplifier
or your speaker Itself is at fault.
If your system sounds faulty but you are un
able to pin down the source of the diffuclty, go to
your dealer for advice. Do not assume that It Is
necessarily your speakers which are at fault. For
example, your stylus may be worn or defective.
Do not return your speakers to the factory
for repairs without prior consultation with your
dealer or with the factory, All repairs are done
at the factory to Insure that the speakers are
performing to specifications. If a speaker mu9t
be returned for repairs, pack it carefully, referring
to the packing diagram at the back of the man
ual and using all packing material, including the
plastic bag.
The speaker grilles are not user-removabla.
Repairs of the Type A by the owner or dealer
may invalidate the warranty.
Caring For The Finish
The Type A Is handcrafted from the finest
materials. An occasional (perhaps once a year)
thin coat of dark paste wax (clear paste wax for
the oak cabinets) will preserve the beauty of the
finish. Using a paper towel, apply a very liberal
coat of the wax, then wipe off Immediately and
buff thoroughly. Do this to one surface at a time.
Be careful that wax does not get onto the grill,e
material. In this regard, it may be helpful to place
a long strip of stiff paper edgewise Into the
space between the cabinet and grille. Rubbing
alcohol will remove wax from the cloth.
Bi-Ampllflcation
Why?
Bl-ampllfylng the Type A can result In a sub
stantial Improvement In sound quality. To under
stand why this Is possible, consider the normal
versus bl-ampllfled setup.
In the normal, unbl-ampllfled mode the right
and left signals pass from preamplifier to loud
speakers unchanged except for amplitude. Inside
each speaker the Internal crossover divides the
signal Into the midrange and high frequencies
reproduced by the upper sections and the low
frequencies handled by the bottoms. In the bl-
ampllfled mode, shown In figure 4, the right and
left signals are divided after the preamplifier by
the electronic crossover Into high and low fre
quency signals. One stereo power amplifier then
amplifies the highs (both channels) and the other
stereo power amplifies the lows. The highs are
sent Into the upper sections of the Type A's,
where they pass through the midrange and
twoeter crossovers, though bypassing the mid
range's low frequency roll off, and on to the mid
range and tweeter drivers. Similarly, the lows go
to the woofers, by passing the Internal crossovers.
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