Copyright © 1991-1997 by Linn Products Limited. All Rights Reserved.
Page 25
Revised Dec 97
Index
KEILIDH LS 300 :
PROCEDURE ON HOW TO CONVERT TO AKTIV.
History: Please read carefully before proceeding with conversion.
The crossover used in the KEILIDH is a 2nd order crossover (which means that the
treble is out of phase to the bass unit) This applies to all KEILIDHs Due to a screen
printing error on the crossover on the original speakers the total (Absolute) phase
was reversed. When this was noticed the wiring was corrected immediately with the
result that the writing on the crossover was then misleading, so that when the treble
wire connections read:
“T-RED” but had the black wire and
“T-BLK” had the red wire connected.
This can be confusing should any one look at the crossover screen printing!
The final stage in this correction was to change the screen printing so now the wiring
and the screen printing are both correct.
End result: The bass unit is in phase with the input signal and
the treble unit out of phase to the input signal and the bass unit,
ABSOLUTE PHASE IS NOW CORRECT.
Approximate serial numbers :
Original introduced: September 1992
Change to wiring:
Nov 93 to June 1994 Sn 15,400 to 21,000
Change Crossover board:
June 1994 21,000 onwards
(approx.)
NOTE: When using KEILDHS in Surround Sound applications (or using with
other speakers in one room), KEILIDHs below sn 15,400 should be wired with
the POSITIVE [+] speaker wire to the negative [-] ve speaker terminal so that
ABSOLUTE PHASE is correct. If in doubt check the phase, page 6.19
The procedure to convert to Aktiv remains the same for all KEILIDHs, but you should
refer to the specific drawing on the following three pages for clarification on the wiring
.
Tools Required:
2.5 MM Allen key (Hex key)
Small pair side cutters.
Silicone sealer and dispenser.( Where required, see 2 below)
Temperature controlled Soldering Iron and Multi-core solder.
Procedure
1. Place one KEILIDH on its back and carefully remove the lower bass unit trim rings.
2. Remove the silicone that may be between the unit and the cabinet. This is best done
by rubbing it off with your finger. Be careful not to damage the surround of the unit.
Please note: Later cabinets do not use silicone, trim ring is held in place by locating
in a groove in the baffle
3. Remove the 4 bolts that secure the lower bass unit to the cabinet
4. Lift the unit out of the cabinet and *un-solder the wires at the speaker terminals from
the crossover. Place carefully to one side. *NOTE: A short-cut is to leave the unit
soldered but be careful that you hold the unit when moving the cabinet to prevent
it hitting the cabinet and causing damage.
CONVERTING KEILIDH TO AKTIV.
Estimated Time
required: 30minutes
Summary of Contents for KELTIK
Page 1: ...LOUDSPEAKERS LINN...
