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In Reply to: VK60 amp Connections. Is this good or bad? posted by Tyler Newton on November 09, 2002 at 02:05:39:
Tyler,I'm surprised you haven't popped a fuse, yet. Your overall impedance load is 2.67 ohms---if both the 8 ohm and 4 ohm are attached to your amp's OPT, in parallel.
The impedance profile (especially of that subwoofer) versus frequency most likely may bring the actual impedance close to 0 ohms, at certain frequencies. This is dangerous for the amp!
You are probably better off with a separate amp to drive the subwoofer. As you can tell this speaker requires lots of juice to perform. So, a hefty solid state amp (like 200+ watts) may be in order.
Follow Ups:
He says it is a POWERED subwoofer so his tube amp is just seeing the input impedance of the built-in SS woofer amp; probably > 10kohms, so no problem.
Thanks JJ. just as i thought but wanted to make sure. I'm still trying to figure out why this works, why it is ok. would you mind explaining a bit in simple detail why this works ok? Thanks
The woofer amp is just sensing the output voltage from the tube amp and using that information to construct the bass signal it pushes out of the woofer. The woofer is not drawing any significant current or power from the tube amp.
JJ,Since the main speakers and subwoofer amps are connected to the amp at the sametime what impedance does that present to the tube amplifier? any idea? Thanks agian
Thanks for clearing that up.
JJ,Must learn to read all words before the knee jerks. You are correct.
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