BM6500 w/o RIAA module. Am I missing something?

5 replies
Evan
Evan
Gold
1270 posts
Posted July 15, 2025 at 07:56 GMT ? Edited July 15, 2025 at 21:49 GMT
#690191
Maybe more of a BeoMaster issue, but since its a Phono topic, I thought I should post here. Feeling slightly at a loss, must be missing something simple. I can't get sound through Phono input on my BM6500. I'm using an external phono pre to enable a non-B&O deck. Wired the RCA to DIN connector as I always do, L+R on pins 3 and 5, and ground on pin 2. This is the input of the BeoMaster and seems to agree with the above pinout.
My BM doesn't have the RIAA module (I checked).
What am I missing?

Location: San Francisco

I'm an automotive audio and acoustic engineer. I design loudspeakers and full sound systems for new automobiles. I also dabble with studio, consumer and pro audio projects from time to time.
NJ
Nebojsa Jankovic
Bronze
42 posts
Posted July 15, 2025 at 08:26 GMT
#715566
Your photo shows a female input of your BM, which should mate with a male DIN5/7 plug, which should be wired as in the attached photo. Attached photo shows the back of the DIN plug (solder view). If all of this is correct, it does seem that the DIN plug wiring pinout should be reversed as in a mirror image, to match your BM input plug. Also, check on your DIN plug if you have wired also the plug housing…
Attachments (1)

Location: Eindhoven, NL

Evan
Evan
Gold
1270 posts
Posted July 15, 2025 at 22:07 GMT
#715574
Thanks, Nebojsa. Usually following the pin labeling on the rean DIN 5 connector is good guidance, but not this time around. I did throw on an aux cable from Steve, that one at least works so I will compare pin outs later today! Evan

Location: San Francisco

I'm an automotive audio and acoustic engineer. I design loudspeakers and full sound systems for new automobiles. I also dabble with studio, consumer and pro audio projects from time to time.
Evan
Evan
Gold
1270 posts
Posted July 15, 2025 at 22:11 GMT
#715575
Also, for future reference, here is where the RIAA accessory would mount if it was present in the BM6500. This is on the left edge of the preamp board.

Location: San Francisco

I'm an automotive audio and acoustic engineer. I design loudspeakers and full sound systems for new automobiles. I also dabble with studio, consumer and pro audio projects from time to time.
Evan
Evan
Gold
1270 posts
Posted July 20, 2025 at 23:07 GMT
#715598
FYI - problem resolved.  Was having a senior moment! As you mentioned, Nebojsa, it was a matter of the wrong pins. All good now!

Location: San Francisco

I'm an automotive audio and acoustic engineer. I design loudspeakers and full sound systems for new automobiles. I also dabble with studio, consumer and pro audio projects from time to time.
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