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Connecting monoblock tube amps to single subwoofer.

Hi all,

I have added a REL5TX sub to my system which is driven by VTL225 monoblocks.Currently the sub and amps are connected via the low level outputs on my preamp. I would prefer to use the high level connection to the REL by direct  connection to the the VTLs. I am concerned about creation of a ground loop that will cause hum on the system. I have been told that the ground loop can be avoided by running a ground wire directly between each amp. Is this a possible solution, and if so, where / how should the ground "jumper" be connected to each monoblock?

Many thanks in advance for any comments or suggestions.

128x128rbanathy
sgreg1
612 posts
 

I may be dead wrong here but I was always told that the bass signal output is mono. This would mean that when running mono blocks you can tap the sub off just one amp and be ok. The key to this is where you cross over the sub at.

erik_squires
16,037 posts
 

@sgreg1 Bass may be omnidirectional, which is a property of our hearing, but there is NO guarantee from recording to recording, that the signal below 80Hz has been combined and evenly distributed to the L&R channels.

The mastering engineer must chose to do this, and we have no idea when or if this ever happens.

In other words, bass may not be heard as directional but the bass in a recording is not necessarily monophonic.

ieales's avatar
ieales
1,201 posts
 

What we are talking about is two REL T5x’s. They do have a phase adjustment switch and adjustable xover settings.

OOPs. The 0-180 switch is hidden in the logo. A 0-180 switch is the equivalent of moving the sub 14 feet @ 40Hz.

The XO control is frequency only. No filter type or order.

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