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Adding a Pre-Out to an integrated tube amp

I've got two sub amps with line level only inputs and a Melody I880 integrated amp with no pre-out. So I want to add a pre-out for the sub amps. Two amps so need L/R not summed to mono. Being a tube amp everything is easily accessible and first thought was take right off from the volume. But then doing some research saw people recommend using an op-amp or resistor, and some others saying you need a schematic to take the signal after the pre-amp stage but before the amp. Seems to me line level should be enough, ie right off the volume will be okay, but will it? Anyone done this and know what will work?
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Showing 4 responses by erik_squires

erik_squires
15,930 posts
 
     I may be mistaken, but I thought the main benefit of speaker level connections was for powered subs, that accept speaker level inputs, with the sub's input coming from the speaker level outputs of your main speakers' amp or amps

I think of it more of a convenience feature. They don't implement a high pass filter since that would be expensive and prone to error due to variable nature of speaker impedance from model to model.

Line level crossovers can implement low and high pass filtering more consistently.

erik_squires
15,930 posts
 
If this is a high quality integrated leave it alone. Sell it and get something that works for you.

Leave first time electronics hacking to cheap gear you don't mind ruining.

Best,
E
erik_squires
15,930 posts
 
Are you aware that the voltages in a tube pre are lethal? Just letting you know.
erik_squires
15,930 posts
 
Um, is this some cheapie you don't mind using for an experiment??

E
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