[Harp-L] 8 ohm or 16 ohm jack for cab?

Ralf K. Buschner r_buschner@xxxxx
Thu Jun 25 10:03:32 EDT 2020

Not true. Tube amps are short circuit proof, but crash with a too high load 
or open circuit when you give them an input signal. A mismatch of 100 % is 
usually accepted, a 16 Ohms load on  8 Ohms output is still ok, but I 
wouldn't see it as a durable solution. Lower load impedances can't kill a 
tube amp. A 4 Ohm speaker cabinet is fine on a 8 or 16 Ohms amp output.
Nevertheless the sound will change with a mismatch due to the damping 
factor beeing different. Another problem is, that the amp will send more 
power to the speaker, when the speaker has a lower impedance - if fully 
cranked up, the amp could destroy the speaker, because the power is bigger 
than nominal then.

See ya,
Ralf, ham radio op DL5MHK and familiar with tube amps since the late 70s...

Am 25. Juni 2020 15:04:33 schrieb Roger Frébault <roger at xxxxx>:

> Hello,
> Since the two 8ohm speakers are parallel wired your cab have a 4ohm
> impedance. Thus it certainly crash you amp if you connect this cab like
> this.
> https://www.eminence.com/support/wiring-diagrams/
> You have to rewire the speakers in serie to get 16ohm so this will match
> your amp.
> Best regards.
> Roger
> Roger Frébault Le 25/06/2020 à 13:07, John Hurley a écrit :
>> Match the two 8 ohm impedences.
>> John Hurley
>>> On Jun 25, 2020, at 6:51 AM, mr1danga via Harp-L <harp-l at xxxxx> wrote:
>>> Howdy all. Just purchased an amp head and a 2x10 cabinet with 8ohm 50watt 
>>> Red Fang speakers in parallel. My amp is 15 or 30 watts and has an 8 ohm 
>>> and a 16 ohm jack and wondering if I can plug my cab into either one 
>>> without damaging anything.   Also,  if there are advantages to plugging 
>>> into either one.  i.e. more headroom,  more breakup,  more punch  
>>> etc?Thanks 😎Double J in CO

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