So, my stock horn randomly stopped working, and I bought a replacement

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So, my stock horn randomly stopped working, and I bought a replacement one from AutoZone. I snipped off the OEM harness and connected the aftermarket (low tone) horn. It sounds like shit. No one can ever hear it. So I bought a "freeway blaster" high tone horn to replace the crappy low tone one, now it sounds okayish.
My question is this: I thought that most cars had two horns, a low and a high, my car only came with one, attached to one harness, if I split the wires and also hook up the low tone, will I get a better, fuller sound?

Car is a 2008 Mazda 3 hatch.