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?
128x128millercarbon

Showing 2 responses by noble100

millercarbon,

     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.  The idea being the matching or blending of the sound and characteristics of your subs and mains more seamlessly.
     Of course, it's your system but I just wanted you to know, imho, that if there are any sq benefits they will be very subtle and likely not worth the effort. 
     Prior to the Swarm, a local dealer here in Indy let me borrow a couple of smaller REL powered subs for 2 weeks that had both line and speaker level inputs.  I experimented with many different locations for these subs in my room and I compared using line vs speaker level inputs at each new positioning of the subs. Both methods sounded very good to me but I honestly couldn't convince myself I heard a benefit to either method.  I switched to just line level inputs rather quickly, mainly to save time but I honestly could not distinguish between the two.  You may be able to but I'd still suggest not setting your expectations too high.
     I run all my subs via line level and the bass response quality and integration with my mains is exceptionally good.  The hookup is simple and easy.  Just thinking of what you're planning on doing is hurting my head.

Best wishes,
    Tim
millercarbon,

     Please simplify your life and buy 2 Dayton Audio SA1000 sub amps.  You'll save yourself hours of aggravation and possibly electrocution.

     The best new price I found is $409 each on Amazon.

     However, I came across this shop in St. Louis selling 2 used for $600.

https://reverb.com/item/6598543-2-dayton-sa1000-home-theater-subwoofer-amplifiers

     It's on the Reverb site and the ad states the seller is temporarily away.  But this looks like a very good deal worth waiting for and you can message the seller.

Tim