Small Rig work in progress - Advice needed.

Surprised he's just just wound new VC's for ls-1815 for us. 

So I had a play at the weekend, and experimented with your suggested setup. I'll be honest, the 151 tops sounded harsh and overstated when connected to the subs high output. It didn't feel balanced at all, and lowering the volume to get the tops sounding palatable left the subs sounding a bit too light. I reverted back to feeding the subs from the a1000. I figured an entry level system like this from back in the 80s would never of had any fancy active crossovers and the original drivers are still intact so it's probably not worth getting too caught up in best practice setups.  I'm already cutting anything above 100hz this and able to control the gain level independently on a dedicated mono output. I couldn't get my bridged xlr cables to feed a signal to the a500's so I ended up running the 151 tops with a single a500, which seems to be doing the job fine, I don't think they will benefit from any more watts as they begin to get a bit sharp up top when they are really turned up, and the output from the subs starts to get left behind as there's more headroom up top. I played around with speaker position, and actually preferred the 151's sat on top of the subs (4m apart). It seemed to fill out nicely. I then stuck a v8 on top fed from the SMQ and crossed over top limit anything below 100, and then stuck my one functional vs10 in the middle feeding that only between 35 and 100hz, and it sounded spot on. The V8's just added a little more fidelity and opened up the soundstage a bit. After playing around with the levels between them and the 151s, I managed to get a nice blended sound. The vs10 just added a nice warmth to the bass, the 115's are quite kicky so I think it helped to have a softer sub in the mix. Not stomach churning bass, but plenty of volume to party to, and should hold its own against overspill from the reggae sound system and rave rig in the other tents. I didn't feel the need to drive anything very hard with plenty of headroom all round. The Tannoy sub worked really well fed from the SMQ amp, so it really only further motivates me to try and bring the other cab back into the mix. I smashed through a fairly wide mix of music to try and cover off what the DJ's might be playing over the weekend and it all sounded really nice, so generally I'm pretty chuffed with this setup. I did discover a bit of noise in one of the 115 cabs, so swapped over the drivers to make sure it wasn't one of them, and the problem remained in the cab, so think the drivers are all good, just need to locate the rattle (hopefully just something shaken loose over all the years of use). But for a dirt cheap replacement to the shitty warrior subs (which I sold for £10 more than I paid for them) I'm pretty happy with this and think it will do the job nicely for the job in hand. Now I've got about 5 weeks to find someone selling a Tannoy Driver cheap on ebay, but don't think it's the end of the world if I don't find anything in time! Thanks again for your time and input!

Yes I did see that a while back, but thought they were focussed on an un-ported box rather than a band pass enclosure. Wasn't sure if the simulations would be similar in my case.