How to identify your subwoofer board from its part number

Manufacturers print a part number on the board itself, and it is the fastest way to get the right replacement. Here is where to find it and how to read it.

4 min read · Replacement Boards

Where the number is printed

On almost all of the equipment we cover, the part number is silkscreened directly onto the circuit board, usually along one edge. It is not on the model label on the outside of the cabinet — that only tells you the model, which is not always enough.

• Look along the board edges, near the mounting screws
• Check the solder side too — some manufacturers print on the reverse
• Photograph the whole board in daylight, not just the number, in case the number is partly obscured
• Include the model label from the cabinet in the same photo set

Reading the numbers we see most

The HKTS platform uses a consistent numbering scheme. The prefix identifies the board function, and the middle block identifies the model family.

The leading 050 and 051 variants are the same electrical board in different revisions. Where we list both, a single replacement covers both — but always confirm against your own board before ordering.

When the number is unreadable

Silkscreen rubs off, particularly on boards that have run hot for years. If you cannot read the number, photograph the board from both sides in good light and send us the images with the cabinet model. Physical layout, connector positions and component placement identify most boards reliably, and we do this several times a week.

Why the number matters more than the model

Two subwoofers in the same series can carry different boards across production runs, and the same board can appear in several models. Buying by model number alone is how people end up with a board that almost fits. The part number is the identifier; the model number only narrows the search.

If you are unsure, send both. That is what the board finder on this site is for, and it costs nothing to ask.