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1. Specifications

1. Phase Test

Note: Perform the Phase Test on the

4 Ohm passive variation of the Model 32SE

loudspeaker only.

1.1 Apply a +6 Vdc level to the input

terminals on the rear of the loudspeaker

enclosure. Be sure to observe polarity.

1.2 With the dc voltage applied, observe

the motion of the loudspeaker cone.

It should move outward.

Note: For the following tests, all listening

should be done at a distance not to exceed

one foot. Set all transformer version loud-

speakers to the 32 Watt tap for these tests.

2. Air Leak Test

2.1.1

4 Ohm passive units:

Apply a 6 Vrms, 80 Hz signal to

the loudspeaker input terminals.

2.1.2

70/100V variation units:

Apply a 30 Vrms, 80 Hz signal to

the loudspeaker input terminals.

2.2 Listen for air leaks around the driver,

front baffle and rear input terminals. Air

leaks will be heard as a hissing or sputter-

ing noise. Repair any air leaks. All repairs

must be hidden.

3. Rub and Tick Test

3.1.1

4 Ohm passive units:

Apply a 6 Vrms, 80 Hz signal to

the loudspeaker input terminals.

3.1.2

70/100V variation units:

Apply a 30 Vrms, 80 Hz signal to

the loudspeaker input terminals.

TEST PROCEDURES

3.2 Listen for any rubbing or ticking noise

from the driver. Replace any driver that is

defective.

Note: There is a normal suspension noise.

To distinguish between a rub or tick and

suspension noise, displace the cone

slightly with your finger. If the rubbing can

be made to go away or get worse, then it

is a rub or tick. If the noise stays the same,

it is suspension noise.

4. Power Sweep Test

4.1.1

4 Ohm passive units:

Apply a 6 Vrms, 80 Hz signal to

the loudspeaker input terminals.

4.1.2

70/100V variation units:

Apply a 30 Vrms, 80 Hz signal to

the loudspeaker input terminals.

4.2 Sweep the signal generator from 80 Hz

up to 3 kHz listening for any buzzes, rattles

or extraneous noises.

Note: The whooshing noise from the port

around 80 Hz is acceptable.

4.3 Reduce the input level to 4 Vrms for

4 Ohm passive units or to 14 Vrms for

70/100V units. Continue sweeping the

signal generator up to 5 kHz, listening for

any buzzes, rattles or extraneous noises.

4.4 Replace any driver that has a buzzing

noise. Redress any wires that make a

buzzing or rubbing noise.

1.5mH

RED

5.0uF

BLACK

COMMON

Figure 1. Model 32SE Passive Crossover

Schematic Diagram

RED

5.1 Ohm