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RS212 impedance question

Discussion in 'Amps [BG]' started by Webtroll, Feb 4, 2014.

  1. Webtroll

    Webtroll Rolling for initiative Supporting Member

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    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.
  2. Selta

    Selta

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    Uncompensated endorsing user: EBMM
    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.
  3. Webtroll

    Webtroll Rolling for initiative Supporting Member

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    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.
  4. Selta

    Selta

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    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.
  5. B-string

    B-string Supporting Member

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    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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