yorkville yx18s sub
 

i am trying to set up a sub in our system. i understand the yx18s has a built in crossover so can i simply run the mixed signal (say vocals,keys, bass,guitar) out of our PA into the sub and then daisy chain the sub to the mains - will the crossover in the sub keep the low stuff out of the mains

The YX18S does not have a built-in crossover, but rather a built in low-pass filter. Thus, you can send it a full-range signal (the main mix) from your power amp, and it will filter out the high frequency components.

However, if you daisy chain your mains from the sub, the mains will receive a full range signal. So no, the sub will not keep low stuff out of the mains.

You can still avoid buying a crossover by running the sub off an aux, then you can dump the lows in the main EQ without affecting the sub. You won't be able to EQ the sub without an additional EQ, but that's less of a compromise than sending sub bass to the mains.

hmm - the yorkville spec sheets indicate it has an "internal passive crossover"

Here's the dope on the enclosure:

http://www.yorkville.com/downloads/s...myx_series.pdf

The crossover is indeed internal and sends the <150 hz content to the 18" driver. The enclosure inputs are all wired in parallel so if you daisy-chain the sub with a main, the original full-spectrum is sent to the mains...not the most efficient method by a long shot. Aux-fed or external crossover processed are the preferred methods.

Riis

Cancel that aux idea, 150Hz is too high a crossover point, and it's only a 6dB/oct slope. Cheap subs put out a lot of overtones even with a proper crossover, with a crappy one like that it will sound brutally boxy. Try at least renting a proper crossover (should have 12+dB/oct slope), set it to 80-100Hz. Another option is to power it with an IPR 1600, which will be right near 400W at 6 ohms and has built-in 100Hz crossover. You could power the tops with the other side, set crossover to hi pass.

^^^ Secondhand crossovers are relatively inexpensive and plentiful. You can snag a decent one for well under $150. FTR, I crossover @ 100 hz with an LR 24 slope...which is pretty much standard on the simpler dbx stuff.

Riis

Unfortunately, Yorkville is not being entirely accurate. A crossover is a circuit that splits a signal into two or more frequency bands, using multiple filters. In the case of the YX18S, it only has a passive low-pass filter, and thus does not provide a second hi-passed signal for the mains.

Unless your power amp has a built in crossover (which may work fine for your needs), I think you are better off getting a simple rackmount crossover. As Zooberwerx said, they are cheap and plentiful.

thanks people - i now have a much better understanding

Sidenote: I use the cheapest subs Yorkville ever produced...the Y118S http://www.yorkville.com/products.as...1&cat=31&id=58

The previous owner installed Speakon jacks in the back and may have installed new drivers...I'm too lazy to look. These things just won't die. We even use them for step-stools when installing lighting.

Riis