- Amps [BG]
|Webtroll ||02-04-2014 04:22 PM |
RS212 impedance question
I bought a TC Electronics RS212 and I love the tone and the light weight and am wanting to buy a second one, but the impedance is a little strange to me. It is rated for 8 ohms, but on a meter it reads 5.8 ohms. I emailed TC Electronics and was told that 5-6 ohms is normal on a multimeter, but that the impedance varies with frequency.
While I do not doubt this, I still worry about using the cab (or cabs if I buy more) with my non TC Electronic amplifiers. Can anyone shed any light or experience on this? I run my Crown XTi 2000 bridged which has a 4 ohm minimum load, so 2 of these cabs metered will be below that. Will I be running the risk of damaging the amp or will the impedance take place at frequency and not be a concern?
My other amps at this time are a Boogie D-180 (all tube) and Boogie Pulse 360 (solid state power) all of which have a minimum 4 ohm load. The Crown will drop to 2 ohms per channel if split.
|Selta ||02-04-2014 04:29 PM |
It's an 8 ohm cab. All cabs will measure differently when you measure DC resistance, because you are measuring at a fixed frequency, and not the actual inductance. Impedence varies by frequency.
|Webtroll ||02-04-2014 04:31 PM |
Thanks for the speedy response! So safe to use as a regular 8 ohm cab and all is reading as normal. I still wish I could use 3 of them for my Boogie head, but that seems ill advised.
|Selta ||02-04-2014 04:36 PM |
Yeah, that puts you a fair amount below the min load. I personally wouldn't do it. The D-180 may be more forgiving about it than the Pulse, if you had to do it with one of those two.
|B-string ||02-04-2014 04:36 PM |
All is normal, you read the DCR. There are actual impedance meters but plotting the impedance across the frequency band is the only reliable way to determine the "nominal" impedance.
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