Okay would be nice if you could return the amp but if not no use crying over spilled watts.
You keep saying DAC but I'm not seeing anything makes me think you need a DAC. Since you inherited all this from your dad I would assume he had everything you need to - ie, he was playing records so he must have had a phono stage either built into the Onkyo or the record player. Let's go for the simplest first- look on the back of the Onkyo for RCA input that says PHONO. Let me know.
Next there's different things you can do. My advice is you do what you can do now and for free or cheap and not be in a hurry to spend money until you have a much better idea what you're doing.
What you can do now and for next to nothing: Hook everything up to the Onkyo and enjoy.
While you're listening spend a minute thinking about what you're hearing. What you're hearing is the sound coming from the tape (or record) through a wire (interconnect), into the pre-amp stage of the receiver, then the power amp in the receiver, then through more wire (speaker wire), finally to the speakers. All of it powered by electricity that came from a wall through more wire (power cords). Every single one of these (and more I haven't mentioned) contributes for bad or good to what you hear. Its not just the amp and speakers. Its the interconnects, speaker wire, and power cords. Its everything.
So next step very cheap, you go on-line to some place like partsexpress.com and buy for next to nothing ($6, something like that) this thing called a Line Out Converter or LOC. None of these are very high quality and unlike most things you really don't get more when you pay more and this is probably not something you'll be using for long anyway so one of those rare times when it really is okay to go cheap.
The LOC will allow you to use the Onkyo as a pre-amp. So you will be able to hear exactly the difference between the amp in the Onkyo and the Outlaw amp you bought. Probably you're hoping the Outlaw sounds a lot better but that's not the point. The point is you learn the only way of knowing which is better and by how much is to actually compare by listening side by side.
First things first though. Does the Onkyo have a phono input?
You keep saying DAC but I'm not seeing anything makes me think you need a DAC. Since you inherited all this from your dad I would assume he had everything you need to - ie, he was playing records so he must have had a phono stage either built into the Onkyo or the record player. Let's go for the simplest first- look on the back of the Onkyo for RCA input that says PHONO. Let me know.
Next there's different things you can do. My advice is you do what you can do now and for free or cheap and not be in a hurry to spend money until you have a much better idea what you're doing.
What you can do now and for next to nothing: Hook everything up to the Onkyo and enjoy.
While you're listening spend a minute thinking about what you're hearing. What you're hearing is the sound coming from the tape (or record) through a wire (interconnect), into the pre-amp stage of the receiver, then the power amp in the receiver, then through more wire (speaker wire), finally to the speakers. All of it powered by electricity that came from a wall through more wire (power cords). Every single one of these (and more I haven't mentioned) contributes for bad or good to what you hear. Its not just the amp and speakers. Its the interconnects, speaker wire, and power cords. Its everything.
So next step very cheap, you go on-line to some place like partsexpress.com and buy for next to nothing ($6, something like that) this thing called a Line Out Converter or LOC. None of these are very high quality and unlike most things you really don't get more when you pay more and this is probably not something you'll be using for long anyway so one of those rare times when it really is okay to go cheap.
The LOC will allow you to use the Onkyo as a pre-amp. So you will be able to hear exactly the difference between the amp in the Onkyo and the Outlaw amp you bought. Probably you're hoping the Outlaw sounds a lot better but that's not the point. The point is you learn the only way of knowing which is better and by how much is to actually compare by listening side by side.
First things first though. Does the Onkyo have a phono input?