I'm going to give my opinion on a few things brought up in this thread. Take them for what they are worth. But remember, they were free.

Speaker specs: The only ones I look at are it's Ohm rating (the receiver/amp needs to be compatible) the low frequency rating for mating with the sub as John pointed out, and the SPL (Sound Pressure Level) aka sensitivity. As for the "power" ratings, I don't pay too much attention to these for two reasons. #1, just about every decent speaker has a rating that far exceeds any receiver that I would own so why worry about it. #2, I have no idea how they even come up with these numbers.
There is another power number that is sometimes mentioned and that's the low power number. A rating such as 10-200 wpc. As I understand it the low number is how many watts a speaker needs to produce it's stated frequency response. Not sure if it's useful but at least I know what it is.
Receiver ratings: These are even more confusing. The pioneer 919 is listed as 120 X 5 @ 8 ohms with .05% thd. But it's at 1khz not full range. And it doesn't specify how many channels driven so you can bet it's one. Most receivers can match their rating with two channels driven but when pushing 5 the actual output drop quite a bit. Even more with 7 ch driven. The 919's manual also has a stereo (2 channel) and full range (20-20,000hz) rating of 90 wpc. But the thd is .2% not .05%. Home Theater Mag tested a 918 last year and found 35-40 wpc with 5 channels driven and .1% thd, which is the highest level of distortion I look at.
Two other specs I look for are the receivers weight, 19lbs-3 oz, and it's power consumption, 350 watts for the 919. However, the reviewer found the receiver to be strong enough for most applications. In comparison, my Pioneer 59txi's two channel rating is 130 wpc @ 8 ohms from 20-20,000 hz with .09% thd. @ 6 ohms it's rated 160 wpc. See how the number rises when you change a parameter? And it weighs 68 lbs and consumes 735 watts. My H/K 435's specs are 80 wpc in stereo from 20-20,000 hz, .07% thd @ 8 ohms. With 5 channels driven it's 65 wpc. And it consumes 1000 watts when driving 7 channels and weighs 39 lbs. You need the right numbers to make a fair comparison. And numbers are statistics which can be manipulated in order to miss-lead.
Are Cerwin-Vega!'s good speakers? In general, yes and not so much. I owned the VC5 center and the matching bookshelves quite a few years ago and although they were worth the $150 I paid for them they were not for critical listening. If you're looking for a decent speaker that plays loud and shakes the house then maybe. If you're looking for a speaker to really
listen to, then maybe not. Again, just my opinion.
Equalizers: I like'em, most knowledgeable members don't. If you buy a stand-alone model get a good one. Avoid the sub $100 ones as they add quite a bit of distortion. The Pioneer models you are looking at are equipped with MCACC which is an automatic setup and eq program. It can also be adjusted manually if you prefer. I do.
Speaker break-in: I believe there is some merit to it but much of it lies with the owner adapting to his/her new speakers.
As for turning off the sub, he meant in the receivers setup menu.

Hope this helped.