speaker question

Probably not a winning idea. Chances are the speaker is a low performance one.

In general a crappy amp will sound decent through a good speaker cab. A crappy speaker will always sound crappy.

 

+1 not the best of ideas. At best, you can measure the DC resistance of the spkr to figure its nominal impedance, but don't for a second assume its power handling by the amps output. It could be anything, but what it's not- is a good solid bass spkr. Just use your new amp with a good bass cab.

 

If you really need the additional cab and money is tight, you could replace the cab's 'replacement' 15 inch driver with an 8 ohm driver having at least 300w (thermal) power handling and with t/s specs that would be compatible with that cab. Online photo shows the cab to be ported at the bottom. If you provide cab, wall thickness and vent dimensions we can provide some useful advice. The driver will likely cost around $100 USD or more.

 

+1 for all this.

If you can swing the money, you are much better off getting the GK Neo 115, than trying to work with the relatively small combo cab.

Good luck!

 

It is really simple. The numbers matter very little. Use your EARS, not a calculator (and this is coming from an electronics engineering student). Just listen for signs of distress. When it starts to SOUND like it is getting too much, then it IS getting too much. Simple as that.

But if you are interested, here's a really simple video showing how to check impedance.


You can Google "how to check speaker impedance" and a gagillion videos and web sites will pop up.

 

That video is for checking resistance, not impedance.

 

Fair enough. The load and frequency (as well as the rest of the circuit) will make a difference. I was just trying to keep it simple. Do you honestly think the OP is at the point of trying to wrap his head around that? Not knocking him, just pointing out his inexperience with electronics.

 

whats the difference

 

Resistance applies to direct current, impedance, also measured in ohms, applies to alternating current. Resistance is a component of impedance, but impedance also has additional components due to any capacitance or inductance in the circuit (the capacitance and/or inductance in the circuit cause additional impedance, I can't recall the correct names- reactance and ???).

https://en.wikipedia.org/wiki/Electrical_impedance

It was reactance! Yay me!

 

I didn't realize speakers were AC.
Go Tesla!

 

All the more reason to use correct terminology.
Using a multimeter method to "impedeance", could cause the OP to think he has an oddball 6 ohm or 3 ohm driver.