![Sansui sp 1500 crossover schematic diagram](https://kumkoniak.com/109.jpg)
![sansui sp 1500 crossover schematic diagram sansui sp 1500 crossover schematic diagram](https://www.analogalley.com/osccart/images/sansui_sp-x6700_6300.jpg)
Parts Express sold me everything I needed for these speakers, and a few others: A polarized capacitor would be likely to explode if used in the same application. These are bipolar electrolytic capacitors, a special type that is slightly more expensive than standard electrolytic models, but they are required because speaker current is AC and must flow both directions across the capacitor.
![sansui sp 1500 crossover schematic diagram sansui sp 1500 crossover schematic diagram](https://i.pinimg.com/474x/eb/db/fa/ebdbfa2066517566521a31eca1d3866d.jpg)
The three blue cylinders are the crossover capacitors, in 2.2uF, 4.7uF and 10uF varieties. With the crossover removed, it’s easy to see the components that need replacing. If you’re buying speakers from Craigslist and they have adjustable crossovers, make sure to check them on all settings to help assess their condition. It’s easy to forget speakers have parts that can degrade inside, when they’re almost always treated like a single box unit. The crossover network, distributing and filtering the amplified audio to the different drivers, contains capacitors which can fail with age just like the capacitors in an antique radio or in your modern electronics. Six screws to remove the crossover panel from the back, disconnect the driver leads from the spade terminals, and pull out of the back. Like all older electronics, speakers also have components that can fail inside. Unlike newer speakers (including a pair of Sansui SP7500X that are still waiting to be refurbished), these are very easy to remove. Sorry, no vintage ad anymore! I should’ve hosted it here instead. Click on the image for the full-size version! The web site is down apparently, replaced with a placeholder park page redirecting to a spam site. Here are the vintage ads for the Sansui speakers. I’ll share some photos below, and then dig into reconditioning them! Produced between 19, these beautiful walnut speakers are solid and very heavy – definitely high quality. I’m always keeping my eyes out for interesting vintage hi-fi speakers from the ’60s-’70s, and found a nice set of Sansui SP2500s on Craigslist.
![Sansui sp 1500 crossover schematic diagram](https://kumkoniak.com/109.jpg)