McIntosh ML 1C Service Manual

Page 2

SPECIFICATIONS

SPEAKER SIZE
Woofer l2|I dia. frame size (l0 dia. radiator) .
Low mid-range 8 dia. frame size (5" dia. radiator)
Upper mid-range 1-1/2 dia. dome radiator
Tweeter l-S/B dia. coaxial super radiator
CROSSOVER FREQUENCIES

ZSOHZ, I.5kHZ, 5 7kHZ

IMPEDANCE

8n Nominal

POWER HANDLING: Sine wave steady state

flNE WAVE
POWER
LIMlT

IN WATTS

FREQUENCY IN H1

Avoid operating the speaker system with sustained sine wave signals at power levels
greater than the indicated limits. Permanent damage may result.

POWER HANDLING: Program Material

High energy peaks normal to orchestral music are easily and faithfully reproduced
by the speaker system. These peaks are of relatively short duration and do not
produce the heating effect caused by sustained tone operation. The ML-h speaker
system will handle up to 300 watts of orchestral music program material. Care
must be taken, however, to use a power amplifier that has an adequate power rating.
If a low power amplifier is used. the loudest passages may be clipped by the
amplifier. This clipping will cause the speaker to sound distorted. The large
harmonic content of a badly clipped signal can cause excessive heating and re-
sulting damage to the high frequency speaker elements and crossover network.

OUTPUT LEVEL

In a reverberant room the system will nominally produce an 89dB sound pressure
level when driven at a one watt level referred to En.

Page 11

REPLACEMENT OF l-l/Z DOME LOUDSPEAKER 036-003
MODEL: ML-IC
PURPOSE OF MODIFICATION: To maintain the same acoustic output.

WHAT UNITS ARE AFFECTED: Serial NO. NIAOOI through NZAS39.
Serial No. LZASAO through L3A540.

WHEN MODIFICATION SHOULD BE MADE: When replacing defective
036-003 l-l/2l| dome loudspeaker.

MCINTOSH MODIFICATION KIT: No kit available.

PARTS REQUIRED:

QUANTITY PART NUMBER DESCRIPTION
l 036-Ol6 l-l/Z Dome Loudspeaker
I l22-I28 .ISmH Choke
PROCEDURE:
Step I Remove l2 woofer and fiberglass exposing crossover.
Step 2 Locate the series capacitor. if it reads 6uF/50V NP,

remove and replace with a 6uF/iOOV NP capacitor.

Step 3 Connect .ISmH coil in series with the dome crossover.
Pull yellow and black wires through hole to rear of
mounting panel. Seal hole. Connect wires to dome
speaker.

Step A Replace fiberglass and l2 woofer. Be sure a tight
caulking seal is made between the 12 woofer and the
cabinet.