[Solved] So apparently I never needed the XLR cable, the people at this local music shop were saying it's a better quality than the regular 3.5mm aux cable. All I did to make it work: 1/4 cable to 1/4 cable: cabinet to mixer amp. 1/4 cable male adapter to 3.5mm female adapter. Connect 3.5mm aux to adapter and other end of 3.5mm to phone and it works. I mainly didn't know how to use the mixer amp. All I had to do was turn 2 knobs instead of one. Both volumes for input and output. Also to throw this in here: the 1st music shop I went into and asked how can I get this working, he basically said "OH OH I just figured it out. Give me 3 minutes." He then comes out with a bunch of cables and tells me it will cost me $50 before he can even open it to see if it works... I said no and he said i won't be able to get a signal with my 3.5mm aux cable. He said I needed a gold plated connector or something. Thank God I never took his deal. Both Peavey Bass Cabinet: BW-15 Speaker Model 215 Mixer Amp: XR-600B Mixer Amp (I'm not that experienced in this field) My intention: What I'm trying to do is to just play regular music with it from my phone. I have a XLR to 3.5mm audio jack to connect it from my mixer amp to my phone. My question: Is there other options than installing a tweeter? Just want to explore my options. So I got this bass cabinet from a school throwing them out. When ever I play songs the vocals are either very low in volume or muted all together during random parts of a song. Some other high notes would also be lowered a bit but not that much. I'm assuming it's because this is a bass cabinet and only plays low frequencies. I went to a music shop about a month ago and the guy suggested putting on a tweeter so it can play more clearly.