Support - Speaker Recommendation
Try the stock speaker in your machine first. You might find that it sounds just fine. In some of my machines, I found very
little difference between stock and new speakers. If you need a new one, I recommend a "GRS 8FR-8" speaker. It's an 8 ohm,
8-inch, full-range round speaker. This is same as a Pioneer B20FU20-51FW speaker. I have one in my Bally Star Trek and Bally
Lost World pinball machines. This speaker can also be used with my replacement Squawk & Talk and my replacement Sounds
Plus / Vocalizer boards.
You can get it on Amazon
The speaker is much larger than the stock one, but you can still mount it without enlarging anything. Here are some
installation instructions for the eariler games like Star Trek. Start by removing
the old speaker. Save the screws and use them to secure the stock speaker grille as shown.
Then mount the new speaker so that the mounting holes match up with the corners of the square wooden plate. I used some
short wood screws (or machine screws) and washers for this.
Side Note 1: Do not use a 4-ohm speaker with my custom Early Sound board. This speaker draws way too much power from my
amplifier which in turn tries to draw too much power from my on-board power supply. The power supply is either
18v or 39v depending on when you purchased my board. The TIP29 transistor (right heatsink) and upper 1 watt
surface mount resistors will get really really warm.
Side Note 2: My replacement Squawk & Talk and Sounds Plus/Vocalizer sound boards, on the other hand, WILL work with both 8-ohm and
4-ohm speakers. The power to the amplifier is done differently. The recommended 8-ohm speaker above is a good speaker for these boards as
well.