Guild Maverick Bass Speaker Outputs

[dcookNH]

hey yall,

On the back of my Maverick bass amp, there is a "speaker" jack and also a jack labeled "EXT. Speaker 8-16 ohms."

I have the "Speaker" connected to the 8ohm internal speaker. I have the other connected to the EXT which is an 2x10 cab, also 8 ohms. I was surprised that when both are plugged in, both work. I thought using the EXT would shut off the internal speaker, but it doesn't. It sounds fine, but is this is how it is supposed to work?

thx all

Don

 

[Rocky]

hey yall,

On the back of my Maverick bass amp, there is a "speaker" jack and also a jack labeled "EXT. Speaker 8-16 ohms."

I have the "Speaker" connected to the 8ohm internal speaker. I have the other connected to the EXT which is an 2x10 cab, also 8 ohms. I was surprised that when both are plugged in, both work. I thought using the EXT would shut off the internal speaker, but it doesn't. It sounds fine, but is this is how it is supposed to work?

thx all

Don

Not sure exactly how the Mav is wired, but most combos are wired in the standard "Fender" method.

The "Speaker" jack is a shorting jack, and the "Extension" jack is wired in parallel.

If nothing is plugged into the "Speaker" jack, the secondary of the output transformer is shorted - which in the short term keeps the OT from being fried by 'flyback' voltage, but in the medium/long term burns out the amp. If a speaker is plugged into the "Extension" jack (NEVER do this) you'll get a very low level of sound from the speaker, as most of the current is going through the shorted jack.

If speakers are plugged into both jacks, both speakers will share the power. In your case, the internal speaker, being 8 ohms gets approximately half the power, and the cabinet, also being 8 ohms gets the other half - divided between the two speakers. The amplifier output section sees a total 4 ohm load.

The "8-16" designation means that the amp can tolerate that 4 ohm load, but it's likely designed around the 8 ohm load of the internal speaker.

If you used a 16 ohm extension speaker cabinet, the output section would see a 5.3 ohm load - closer to the design, but the extension cabinet would only get 1/3 of the power generated.

If you only want sound from the extension cabinet, unplug the internal speaker, and plug the cabinet into the "Speaker" jack.

 

[Default]

Yes.

hey yall,

On the back of my Maverick bass amp, there is a "speaker" jack and also a jack labeled "EXT. Speaker 8-16 ohms."

I have the "Speaker" connected to the 8ohm internal speaker. I have the other connected to the EXT which is an 2x10 cab, also 8 ohms. I was surprised that when both are plugged in, both work. I thought using the EXT would shut off the internal speaker, but it doesn't. It sounds fine, but is this is how it is supposed to work?

thx all

Don

 

[dcookNH]

Not sure exactly how the Mav is wired, but most combos are wired in the standard "Fender" method.

The "Speaker" jack is a shorting jack, and the "Extension" jack is wired in parallel.

If nothing is plugged into the "Speaker" jack, the secondary of the output transformer is shorted - which in the short term keeps the OT from being fried by 'flyback' voltage, but in the medium/long term burns out the amp. If a speaker is plugged into the "Extension" jack (NEVER do this) you'll get a very low level of sound from the speaker, as most of the current is going through the shorted jack.

If speakers are plugged into both jacks, both speakers will share the power. In your case, the internal speaker, being 8 ohms gets approximately half the power, and the cabinet, also being 8 ohms gets the other half - divided between the two speakers. The amplifier output section sees a total 4 ohm load.

The "8-16" designation means that the amp can tolerate that 4 ohm load, but it's likely designed around the 8 ohm load of the internal speaker.

If you used a 16 ohm extension speaker cabinet, the output section would see a 5.3 ohm load - closer to the design, but the extension cabinet would only get 1/3 of the power generated.

If you only want sound from the extension cabinet, unplug the internal speaker, and plug the cabinet into the "Speaker" jack.

thanks! I do notice an occasional dip in volume when both the internal speaker and the cab are plugged in. It's not the power tubes as those are brand new, and I see the same behavior with the original tubes. i think to be safe ill just run the external cab instead of both.

 

[Rocky]

thanks! I do notice an occasional dip in volume when both the internal speaker and the cab are plugged in. It's not the power tubes as those are brand new, and I see the same behavior with the original tubes. i think to be safe ill just run the external cab instead of both.

That could be dirty jacks, but I'd probably have a tech check it out.