KEF REFERENCE 107 - Amplifier Requirements and Power Handling; Record Suggestions

It is good practice occasionally to remake all connections. in the case of wrapped
connections, cut off the old wire and strip the insulation back to expose fresh.
CAUTION: Certain exotic types of cable have high capacitance which can cause instability
with some amplifiers. If in doubt, select a cable from the table, or consult your dealer.
2.4 AMPLIFIER REQUIREMENTS AND POWER HANDLING
The Model 107 will give its optimum performance on programme material having a wide
dynamic range when driven by an amplifier capable of delivering up to 300 watts into a 4
ohm resistive load. In practice this means an amplifier whose output rating is 150 watts
into an 8 ohm load. Model 107 can, however, be driven to perfectly adequate domestic
listening levels by an amplifier rated at as little as 50 watts. The Model 107 is capable of
achieving very high volume levels without distress, and of sustaining short term amplifier
output peaks in excess of 400 watts.
If Model 107 is used with your existing amplifier you will almost certainly find that you
need a lower volume setting than you have been used to, and the dynamic range you hear
(dynamic range is the difference between the loud and soft parts of the music) will be
greater. This, coupled with the imaging capability and overall balance of the Model 107,
will enable you to hear more musical detail, and perceive more about how, and where, the
recording was made.
We suggest you retain all the packaging in case you need to transport the speakers at a later
date.
2.5 RECORD SUGGESTIONS
The importance of listening tests in setting up your hi fi system has been emphasised in
these instructions. Use records having good tonal balance with good imaging qualities,
covering as wide a range of music and voice as possible. To assist your setting-up, and add
to your musical enjoyment, KEF recommend the following records (table B) in either
analogue or CD (where available) format.
A general check on system performance can also be carried out using one of the many test
discs available. One such, which is particularly simple to use is "The Enjoyment of Stereo’
by John Borwick, EMI SEOM26.