I may be able to get the amp modded if I know what to ask for, as we have a MF wizard in the UK.
The mod is pretty simple, the request would be:
I want you to modify the Tape Rec connectors to function as a 'Preamp Input', so we can create a processor loop for an external crossover for a sub.
I assume the loss of the Tape Rec function is not a big deal, but maybe you have an RtR deck
In your opinion would going the sub route prove of musical value? I suppose that one is key!
You are asking the guy who has four subs in each of his two systems, and the four in the HT were designed and built by myself. So with that ...
Yes!!! as the optimal positioning of an ESL speaker generally results in poor low-end performance. So adding one or more subs (more is better as they help smooth room modes) allows the system to play lower.
On music, even something as simple as solo piano, the low-end is critical to the sense of weight and depth of the instrument.
And on pipe-organ recordings, totally transforms the experience.
I'm a big Prog Rock fan, and that has some serious low-end demands from well recorded and produced bands.
BUT, how one integrates a sub is important!
This is why I did
not tell you just wire the speaker outs of the 6i to the speaker-level inputs of a sub and call it a day.
To properly integrate a sub, you need to remove the low-end feeding the mains, as that has two benefits:
1- It lightens the load on the amp, and reduces the effort the woofer expends, resulting in less distortion from the woofer.
2- By removing the lows from the units placed in less than ideal locations for those frequencies, you minimize room modes.
Now, you need to figure out how to create a crossover between the pre-amp out and pre-amp in connections.
The right way to do that is to deploy an active 2-way crossover that both splits the signal, applies delay where needed, and performs EQ where needed. But that is technically challenging to set up, not the wiring, but the config and tuning steps.
So a much simpler, although less refined approach would be to take the pre-amp out signal via a splitter cable that has one end going to the low-level signal inputs of the sub (most subs have RCA line-level inputs for L/R) and the other going into a passive
high-pass filter connector that then connects to the pre-amp in connectors. On the sub, set the crossover to match (70Hz in the example here), and adjust levels and polarity so the system is balanced.
See, easy
