brennan JB7 User Manual - Page 4
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Album database
The album database is derived from freedb - a public
domain album database. The database is updated every
three months and is can be obtained through the 3GA
website. The database has been compiled by members of
the public over the years so may contain misspellings and
other oddities.
CDs do not, in general, contain information about album
and track names and a CD has to be identified by the pat-
tern of track lengths - measured to the nearest 75th of a
second. This pattern is a kind of fingerprint used to find
the details in the album database.
Often several CDs share the same fingerprint so you have
to pick the right details when loading a CD. On occasions
a music publisher releases different recordings of a CD so
the fingerprint on your CD does not match the details in
the database. If that happens you can enter the album
name by hand and you may choose to name favourite
tracks by hand.
Standby
JB7 enters standby mode after several minutes of inactiv-
ity. The hard disk is stopped but the only outward sign is
that the source information is removed from the display.
Source information
11:31 am
If there are music tracks to be compressed - it happens
during standby.
You don't have to do anything special to turn it back on -
just press a button - the hard disk starts automatically.
Heat dissipation
JB7 uses very efficient switching power amplifiers and lap-
top disk drives. Nevertheless the display, DSP, motors and
power amplifiers all generate heat and JB7 uses the metal
case - instead of a bulky heatsink or fan - to dissipate this
heat.
It is normal for JB7 to feel warm and it will be warmer
when playing very loud music or loading many CDs one
after the other.
JB7 can overheat if covered or enclosed.
4
JB7 uses a CD mechanism designed for laptop computers.
The mechanism was chosen for its size and performance
at its principal job – getting music onto the hard disk.
JB7 will play CDs directly but the mechanism spins the CDs
at high speed so it is slow to get up to speed and is fairly
loud. Just remember its real job is loading not playing.
CD 12
USB 130
HDD 1023
AUX
JB7 - not really a CD player