Never thought I would have to post this but Audio Guys Help!

So I've been setting up systems and whatnot since I was 16, and have run this set up many many times before, but here goes. I have 2 10 inch old school Memphis Power Reference Speakers in a individually chambered and ported box and a Volfenhag 840 watt 2 channel amp. I decided I wanted to bridge the amp and run it mono-ed, and it worked fine with the speakers run parallel with the individual wires run out of the box like this

except the amp would go into protect mode after about 10 min. So today I went to run the speakers in series, and I had to drill a hole thru the box to run the wires to, the hole in the box is slightly big enough for me to get the wires thru, but now with the speakers run in series the subs hit less than they did when I was running both channels. Here's how I have them run

SOOOO my question is, do you think the small holes could have made this difference or what? I want it to hit hard like it did before without my amp shutting off. Like I said never had this problem before and wonder if it might be the speakers or what??? I was wondering IF I run them parallel like this illustration
and just use one speaker input on my box if you think this may work!!! Please someone help me!!!

Here's the link!!!

Thanks in Advance!!!

the first and last illustration are the same....

I'd say the reason they hit less is because you've halved the wattage by wiring them in series vs. parallel.

I don't know if I can explain this right, but electrically both Figure 1 and Figure three are the same (if you figure the resistance of the wire is negligible). When you wire speakers in parallel, the load the amp sees is half, therefore more power. When wired in series, the load is additive. For example if you have 2 4 ohm speakers wired in series (figure 2) your amp will see a 8 ohm load.

well my thought is first you said run it bridged and then run it mono on a 2 channel amp ,ok... with single voice coil subs ,if you run parrellel ,your subs are wired into 2 ohms ,then when you run them on one channel they are running at 2 ohm stereo ,then you series them which would make it 8ohms then bridged would be 4ohm and would be fine ,but you they wont hit hard at all,my opinion get a 2ohm stable mono block with good wattage and you should be fine ,just my 2 cents

Two svc 4 ohm speaker's parallel impedance is 2 ohm then you bridge mono at the amp it is presenting a 1 ohm load. Pretty sure that amps not 1 ohm stable. ?

Thanks guys, as soon as I get back to work, I'm doin a whole new setup with 4 subs, not sure what size yet and 1 amp on each sub, just was trying to get this hittin good for the time being!!

Thanks!

yeah most 2channel amps will run 4ohm or 2ohm per channel but bridged mono itll only run 4ohm mono. you are running the amp at 2ohm mono or lower and making the amp work harder there fore making the subs hit harder. its not liking that so its getting overworked and going into protect mode. when you wire the subs the other way its running the amp at 8ohm which is not near as low as the amp would like to do its most power at so its like a walk in the park for it, very light load indead. either get a 2ohm stable sub amp or buy two dual 4ohm subs and run the amp at 2ohm stereo.