Wiring question SRS 2.3 (Non-TL)

westmassguy

I have a potential customer with a set of SRS 2.3s. He has the original Doughnut Drivers, MW6513, which are 4 ohm. The other two drivers are MW6510s which are 8 ohms. He has tested all the drivers out of the cabinet, and they all function. Once installed, the doughnuts don't produce any sound. I sent him the Schematics, and the left and right wiring diagrams. According to him, they're wired according to the diagrams. I'm a bit baffled. The Dimensional circuit is supposed to be 4 ohm total. Not sure how you can do that with two 4 ohm and two 8 ohm drivers. Seems to me, they should all be 4 ohm drivers in a series/parallel configuration.
Any advice would be appreciated.

TNTsTunes

The dimensional speakers are a separate circuit and don't do mid bass like other SRS speakers do. The mid bass drivers are wired to the inducer directly. They are very Similar to an original SDA 2 operation. I rewired mine to eliminate the mid bass drivers and to make the dimension drivers do mid bass also.

Basically I duplicated a 1.2 low pass and I'm very happy with it.

TNTsTunes

This quote might help with the resistance of each drivers ohm ratings. A 6513 is a 6511 with mass added I believe.

dorokusai wrote: »

These are the only drivers, aside from the RD tweeters, being manufactured to support vintage products, such as, Monitor, RTA and SDA. You should print this as a reference and keep it handy for the values it contains. There are no grill parts, cables, crossovers, plates or anything else available for the older loudspeakers, unless you know the Polk G O D.

1 Driver Type Q BL Compliance DC Resistance Fs

3 MW 6501 1.47 5.96 N 3.25 E - 3N/M 7.75 Ohms 31 Hertz
4 MW 6502 1.97 5.16 N 1.47 E - 3N/M 3.52 Ohms 44 Hertz
5 MW 6503 1.82 5.24 N 3.55 E - 3N/M 6.54 Ohms 29 Hertz
6 MW 6509 2.1 4.57 N 3.54 E - 3N/M 8.97 Ohms 30 Hertz
7 MW 6510 1.39 6.32 N 3.41 E - 3N/M 6.57 Ohms 31 Hertz
8 MW 6511 1.405 4.34 N 3.496 E - 3N/M 3.13 Ohms 29 Hertz
9 MW 6512 1.905 4.99 N 1.588 E - 3N/M 3.466 Ohms 40 Hertz

westmassguy

That makes no sense to me. You mean the doughnut drivers are wired to the 16.8mh inductor, separately from the two dimensional drivers? I don't have the harness in front of me, so I can't diagnose what I can't see. I wish Polk had the diagram of the harness. The dimensional drivers are not connected to the sub-base drive circuit?

westmassguy

TNTsTunes wrote: »

This quote might help with the resistance of each drivers ohm ratings. A 6513 is a 6511 with mass added I believe.

dorokusai wrote: »

These are the only drivers, aside from the RD tweeters, being manufactured to support vintage products, such as, Monitor, RTA and SDA. You should print this as a reference and keep it handy for the values it contains. There are no grill parts, cables, crossovers, plates or anything else available for the older loudspeakers, unless you know the Polk G O D.

1 Driver Type Q BL Compliance DC Resistance Fs

3 MW 6501 1.47 5.96 N 3.25 E - 3N/M 7.75 Ohms 31 Hertz
4 MW 6502 1.97 5.16 N 1.47 E - 3N/M 3.52 Ohms 44 Hertz
5 MW 6503 1.82 5.24 N 3.55 E - 3N/M 6.54 Ohms 29 Hertz
6 MW 6509 2.1 4.57 N 3.54 E - 3N/M 8.97 Ohms 30 Hertz
7 MW 6510 1.39 6.32 N 3.41 E - 3N/M 6.57 Ohms 31 Hertz
8 MW 6511 1.405 4.34 N 3.496 E - 3N/M 3.13 Ohms 29 Hertz
9 MW 6512 1.905 4.99 N 1.588 E - 3N/M 3.466 Ohms 40 Hertz

I have all those, and that makes sense, since he measured the 6513 as 4 ohm nominal.

TNTsTunes

westmassguy wrote: »

That makes no sense to me. You mean the doughnut drivers are wired to the 16.8mh inductor, separately from the two dimensional drivers? I don't have the harness in front of me, so I can't diagnose what I can't see. I wish Polk had the diagram of the harness. The dimensional drivers are not connected to the sub-base drive circuit?

Exactly. The doughnut drivers are wired to the 16.8mh inductor, separately from the two dimensional drivers. The dimensional drivers are not connected to the sub-base drive circuit. They are separate circuits.

If you look closely at the schematics you can see the mid bass wire for the 16.8mh inductor jumps over the dimensional driver wire.

cdn.vanillaforums.com/polkaudio.vanillaforums.com/attachments/1/8/5/1/1/26693.pdf

gimpod.com/pdfs/SDA_SRS_2.3_Schematic.pdf

westmassguy

I have the schematic already, and I'm beginning to understand what you're saying. The two 6510s are wired in parallel, to the dimensional circuit, and the 6513s are wired in Series, as a separate circuit, and wired through the 16.8 MH Inductor?
They only operate below 150Hz

TNTsTunes

That was what I found and why I hot-rodded mine to have a 1.2 low pass instead.

If you compare the crossovers you'll see it's a simple mod to do and its an existing Polk design.

F1nut

They only operate below 150Hz

Which may be why he thinks he's not hearing anything from them.

westmassguy

F1nut wrote: »

They only operate below 150Hz

Which may be why he thinks he's not hearing anything from them.

That's what I told him last night. I've done a few 2.3TL crossovers, but never the 2.3, so never saw the harness. Very odd way of doing things.