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I have just bought a Gale 3080 subwoofer which, along with my Gigaworks T40 Series II speakers, I want to hook up to my hi-fi. I am new to all this audio stuff, but I understand that, where possible, it's better to use the Line inputs on the subwoofer rather than the High Level inputs/outputs.
What is confusing me a bit is that my subwoofer also has two Line Output connections (one left, one right), but these aren't mentioned in the subwoofer manual. My hi-fi has four pairs of outputs (High Left, Low Left, High Right and Low Right). So I understand I should connect the two Low Outputs from my hi-fi to the two Line Inputs on my subwoofer. But what's the best way to connect my left and right speakers to the system? Should I connect them to the Line Outputs of the subwoofer?
Or should I connect them to the High Left and High Right outputs from my hi-fi? If the Left and Right speakers should be connected to the hi-fi (as I suspect), what are the Line Output connections on the subwoofer for? Thank you in advance. Thanks very much for your help. My hi-fi is just a basic, 15 year-old Panasonic SA-AK44. I think the 'high' and 'low' speaker outputs on it are regarding frequency as it came with a pair of 2-way speakers.
Yes, it looks like the Line Outs on the subwoofer are high-pass filtered outputs. I've plugged my self-powered L/R speakers into them and they sound good. My L/R speakers are actually desktop speakers so the input is a lead with a 3.5mm plug on the end. (But the Left speaker connects to the Right one via an RCA plug.) So they sound good now, but do you think I might be better using the High Level inputs/outputs on the subwoofer instead? (Am asking rather than trying it as I'm going to have to cut my 3.5mm extension cable in half and wire the loose ends into the subwoofer's High Level inputs/outputs in order to be able to connect my MP3 player and L/R speakers to the High Level terminals.).
That is an integrated 'all-in-one' unit. The specs say the 'Low' outputs are 100 W @ 10% THD from 70 Hz to 120 Hz and the 'High' outputs are 40 W from 120 Hz to 16 kHz. Best I can tell it does not have preamp outputs so you are driving your line-level inputs from the speaker-level outputs. The Gale sub is rated to 40 Hz, so you are potentially giving up about an octave of bass by sticking with the SA-AK44.
As for the inputs, normally you'd take the hi-fi's speaker outputs into the high-level inputs of the sub, yes. But if you think it sounds fine now I would not change. You might get less noise and also less gain by using the high-level sub inputs. You would also provide better protection of the sub's input since they would not see a higher-voltage speaker-level output.
A discussion of gain optimization is probably beyond the scope of this thread. Since the hi-fi does not have a full-range output there is no point in using the sub's line-level outputs to drive your L/R speakers (the hi-fi has the crossover built-in and there is no way for you to get around it).
Take the Panasonic's 'High' outputs to the L/R speakers and 'Low' outputs to the sub. I think this is one of those cases where things are mismatched but if it all works and sounds good to you then I wouldn't change it. Just save up for a better system, if and when.