Impedance and speakers

[QC]

Re: Impedance and speakers

Originally posted by ratracer:<br /> The simplest solution is for you to just buy a 2nd speaker system identical to the first.

Help me understand "identical" (sounds a little like Clintonese, huh?). I thought that using 4 10s would have a little less bottom than a single 15, and this 4x10 cabinet does not have a horn. So I was hoping to add a second cab with "identical" impedance and similar wattage capabilty, but not the same configuration. Probably a single 15 with a horn for the bigger gigs to help complete the spectrum and gain some clean volume (I understand that I have not added more wattage).<br /><br />When I look at the conbinations most of the higher end cabinet companies are offering there are a lot of similar examples. Especially 2x10s with a horn and a second cab with a single 15. Am I missing something or is the norm just a little imperfect?

 

[QC]

Re: Impedance and speakers

Originally posted by BoatBuoy:<br /> Only if the power output meets or exceeds the power consumption of the prop.

Yup. Funny how few get that . . .

 

[TwoBallScrewBall]

Re: Impedance and speakers

More than you'll ever need to know:<br /><br /> http://www.physlink.com/Education/AskExperts/ae517.cfm <br /><br />For calcualting amp loading, use the simple resistance formula above. So that means two 8 ohm speakers in parallel make 4 ohms. <br /><br />Two 8 ohm mismatched cabinets will still both see 1/2 of the amp's output. However due to the differing efficiency and freq response, one will always seem louder than the other. You can install a potentiometer type device in front of the louder cabinet to attenuate it to match the lower one then once they match you can use the main volume to adjust your overall level.

 

[QC]

Re: Impedance and speakers

Thanks SN. Got this from your link.<br /><br />"This may sound a little abstract. Impedance really is an abstraction of things that are far more complicated (things like time constants and rise times) that electrical engineers have to constantly consider. The idea of 'impedance' allows for many of these things to be wrapped up into one subject so that they are easier to communicate."<br /><br />I assumed when starting this thread that this was more of an exact science than a sloppy one . . . Cool. Also, your explanation of the efficiency helped too. Now I can see why the crossover etc. would come into play, or a pot like you suggested.

 

[TwoBallScrewBall]

Re: Impedance and speakers

You are welcome.