Polk S15 cone diameter

rota80

Guys - how does one compute the cone diameter for the Polk S15 or does anybody know what it is? I'm supposed to set my Onkyo TX-SR304 receiver differently if it's greater than 6.5 inches

Thanks

Clipdat

It's 5.25" so leave the AVR setting on "small".

rota80

Additional paste from the manual:

This section explains how to specify your speaker configuration. For speakers with a cone diameter larger than 6-1/2 inches (16 cm), specify
Large (full band). For those with a smaller diameter, specify Small
(default crossover 100 Hz).The crossover frequency can be changed on page 51.

Clipdat

And?

mhardy6647

5.25 < 6.5

ergo -- set to 'small'

Or, if you're a typical guy -- just try it both ways and go with whichever you like better.

In terms of how to measure the cone diameter...
The nominal size of a cone driver is historically based on the frame size.
Here, e.g., are the EIA standard dimensions of 15, 12, and 8-inch Electrovoice cone drivers of the 1950s, 60s (and early 70s).



https://www.diyaudioandvideo.com/Calculator/SpeakerDriverDisplacement/Help/



this might be helpful, too...
https://sound-au.com/tsp.htm

rota80

Thanks guys. I find it odd that my Onkyo receiver doesn't have any auto calibration. Anything else I can do?

mhardy6647

https://www.intl.onkyo.com/downloads/manuals/pdf/tx-sr304_manual_e.pdf

rota80

Do I have to go through any steps in the manual if I'm staying with Small?

mhardy6647

are you using a subwoofer?

rota80

Yup upgraded to Dayton Audio SUB-1200 from the onkyo subwoofer a year ago

rota80

so Do I have to go through any steps in the manual if I'm staying with Small?

rota80

rota80 wrote: »

so Do I have to go through any steps in the manual if I'm staying with Small?

Anybody?

SeleniumFalcon

There should be a calibration setup procedure where pink noise begins cycling from left to center to right and the surround channels. You should then be able to adjust the playing volumes from your listening position so that the noise seems the same from all the channels. A great tool for this would be a sound pressure level meter, or even a smart phone app will be helpful. Setting the subwoofer level can be done with a well made recording that has repetitive bass sounds. Adjust the subwoofer level to the point where it can be heard as a separate sound source, then reduce it slightly so all the bass seems to be coming from the front speakers.
You might have to do this a few times to get everything balanced and cohesive.