Shoestring budget Subwoofer - will this work?

[Alexrose1uk]

Ok, ok, shoestring budget might not cover everything as simply as it could, but to try and keep this as simple as possible:
I have some nice floorstander front speakers in my AV setup, unfortunately I had to sell my prized subwoofer when I moved house and got married to free up collateral ().

A while back, I was given (yes given) a Pioneer SSLW500 PASSIVE subwoofer (rated up to 100w, not sure on sensitivity unfortunately), my amp is good, but it does not have active output as far as I am aware. In the future, I would like to get another decent active subwoofer, but for now, I am trying to make do, and would like to get a little bit more bass/bass depth into my setup.

I have an old Ariston stereo amp sitting at my parents which I believe is 30w per channel 8ohm, I'm going to guess the sub is 4ohm, and generally given I have seen 40wpc 6ohm for the Ariston, I'd take a wild guess it'd translate to about 50wpc 4ohm, so 2x 50w =100w, perfect(?). If I was to split the mono subwoofer output from my amp's subwoofer pre-out, and feed it into both Aux channels on the Ariston, could I use this as a makeshift subwoofer amp?
My subwoofer will deal with the filtering/frequency cutoff before passing to the pre-out, so essentially all my amp will be doing is amping the low frequency level my amp passes.

My mind is telling me there is no logical reason this shouldn't work, but I don't fancy spending money on the cables/splitters etc and waste my time messing around with it if A) It won't work B) It won't make any real improvement C) It'll just kill the amp.

What are your thoughts?

 

[Alexrose1uk]

Thanks for your in depth response. I will have to think further on this. The other obvious option would be trying to attach the sub to my av amp via speaker terminals but similar issues apply I would think.

Can you think of any cost effective ways to get this passive box working or is it essentially not worth it?

 

[Alexrose1uk]

Don't worry about my feelings, I got the unit for free
Just figured it must have some use as I have NO sub at the moment and I can't see an AIO being that high powered. I have to wonder if they pass much more power than my Ariston to the amp!

My amp is a Yamaha RX-V1800 if that gives you any further ideas as to ways this could be utilised at minimal cost/if there is anything worth looking for on eBay. Unfortunately I have little soldering/electrical experience.

If not no worries
Just trying to make use of what I have lol

 

[Alexrose1uk]

Is this the isolation transformer I'd need to be able to allow me to use both channels from my audio amp?
http://www.ebay.co.uk/itm/121492264182?ssPageName=STRK:MEBIDX:IT&fromMakeTrack=true#ht_529wt_1399
If the channels can share the wattage current, that MIGHT be possible to drive the sub driver to be something useful?

If still no, completely understand, as I say above it was a freebie and just trying to think of ways to use it!
I think I've just got that obsession of trying to use something!

 

[Alexrose1uk]

Hahaha loving the honesty, thanks for your feedback
To be honest I'd already been thinking that based on the previous feedback, but I'm sure you know what it's like when you have something sitting there and there's a part of you that gets OCD on doing something with it

I think part of me is just sad I had to sell my lovely Quad L-ite sub which was a true beast!