Any Amp and Speaker guru's out there ?

[Grendelmort]

I have a pair of Sansui Club Speakers that I bought at an auction for $150.
These things are huge and are probably 40 years old. The speakers themselves are
In excellent condition - no damage or dry rot cracking of the cones. They play and can handle 300 watts
but there are controls on them for various setting (Bass Boost, Concert, Classical ect) that controls the tone.
Not all positions seem to work.
Does anyone know of a website or YT vid that shows diagnostics to test the functions
and isolate the problems ?
I plan on driving these things with a 300 amp Kenwood Amplifyer.
Thanks in advance 

[Danfromthehills]

I have a pair of Sansui Club Speakers that I bought at an auction for $150.
These things are huge and are probably 40 years old. The speakers themselves are
In excellent condition - no damage or dry rot cracking of the cones. They play and can handle 300 watts
but there are controls on them for various setting (Bass Boost, Concert, Classical ect) that controls the tone.
Not all positions seem to work.
Does anyone know of a website or YT vid that shows diagnostics to test the functions
and isolate the problems ?
I plan on driving these things with a 300 amp Kenwood Amplifyer.
Thanks in advance 

Google AI said this.


I have a pair of Sansui Club Speakers that I bought at an auction for $150.
These things are huge and are probably 40 years old. The speakers themselves are
In excellent condition - no damage or dry rot cracking of the cones. They play and can handle 300 watts
but there are controls on them for various setting (Bass Boost, Concert, Classical ect) that controls the tone.
Not all positions seem to work.
Does anyone know of a website or YT vid that shows diagnostics to test the functions
and isolate the problems ?
I plan on driving these things with a 300 amp Kenwood Amplifyer.
Thanks in advanc
The issue with your vintage Sansui Club Speakers' tone controls is most likely due to oxidation and dirt on the internal contacts of the selector switch or potentiometers (pots). Cleaning these components with a specialized contact cleaner is the primary diagnostic and repair step, which can often be found in YouTube video guides.
Diagnostics and Repair Steps
The problem is almost certainly the result of 40 years of tarnish and dirt buildup on the mechanical contacts inside the switches and knobs. The following steps outline the most common repair process:
Obtain Contact Cleaner: Purchase a can of a professional contact cleaner like DeoxIT D5 (or F5 for fader/pots). Avoid using general-purpose cleaners like WD-40, which can damage components.
Access the Crossover Panel: You will need to carefully remove the back panel of the speaker cabinet to access the crossover network and the rear of the tone control switches/pots.
Apply the Cleaner: Spray a small amount of contact cleaner into any openings in the body of the control or switch.
Work the Control: Rotate the knob or toggle the switch back and forth about 30-50 times to help the cleaner work into the contacts and remove the oxidation. This mechanical action is crucial.
Re-test: Reassemble the speaker and test all the positions of the tone control. The sound should be clear and consistent across all settings.
Repeat if Necessary: If some positions still don't work, you may need to repeat the cleaning process, or in rare cases, the switch or potentiometer may be worn out and require replacement.
Relevant YouTube Videos
While specific videos for "Sansui Club Speakers" are scarce, the internal components and the cleaning process for vintage audio gear are very similar across brands. You can follow guides that show the general process:
"Fix Amplifier Scratchy Volume/Tone Knob DIY" by various creators on YouTube demonstrates the general process of applying contact cleaner to potentiometers and switches.
Videos on cleaning selector switches in vintage Sansui amplifiers (e.g., Sansui AU-D7, 9090 DB) show how to access and clean the internal wafers, which is a similar procedure for speaker crossover switches.

[Grendelmort]

Thanks @Danfromthehills, will give that a try. Sounds like an easy fix if that's the problem.
These things are massive - 22" speaker, 12" speaker, 2 each 6" speakers, 2 each 4" speakers and 2 2" horn tweeters in
each cabinet.
I'll order several cans of of electronic contact cleaner and see how that works !

[phxsparks]

I believe you mean a 300 watt amplifier rather than a 300 amp amplifier.

[phxsparks]

Apply a steady state signal to both speakers.  Check to see that the speaker cones move in the same direction simultaneously.  Low frequency, mid-range and high frequencies.