ac.1. Conversion to Low-Z Headphones:
These rigs are designed to be used with Hi-Z headphones, but if low-Z phones are used
the outboard speaker will not mute completely with the phones connected. To convert to
low-Z phones, make the following wiring changes referring to (Figure 12. Modification
for Low Z Headphones) of this document, and pictorial 8-4 (foldout from page 53), and
pictorial 8-5 (foldout from page 67) of the HW-101 manual:
1. Remove the black wire from terminal strip BA lug 2 and reconnect it to lug 3 (ground).
2. Remove the green wire and the 100Ω resistor from jack AB (speaker).
3. Connect the green wire to terminal strip BA lug 2.
4. Connect the 100Ω resistor removed in step 2 to lugs 2 and 3 of terminal strip BA.
5. Remove the jumper wire from lugs 1 and 2 of headphone jack L.
6. Run a NEW wire along the wiring harness from speaker jack AB lug 1 to the headphone jack
lug 2.
Now the external speaker should mute completely when low-Z phones are used.
Figure 12. Modification for Low Z Headphones
Modifications Page 85
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