Subwoofer connections

adharvey · 31st March 2007, 01:29 PM

Howdy, I have a small single ended amp, it uses two 6p13p Chinese valves (tubes) as the outputs. I have two home made busch horn speakers and I'd like to add a sub. I don't have a preamp and run the cd player straight into the amp.

How do I know the impedance of the sub hi-level inputs. I guess that they should be ok, as they are designed to be inline with the speakers. I'm just a little concerned that I might be putting the sub in parallel with my speakers and dropping the impedance.

Should I be?

Thanks in advance.

Eli Duttman · 31st March 2007, 02:14 PM

Relax! Just be sure to buy a SW with speaker level I/Ps. You connect the SW in parallel with the main speakers. Do NOT "daisy chain".

Below the "corner" freq., the SW's crossover presents a relatively high impedance load to the power amp. As a result, the power amp's load is completely dominated by the main speakers.

Since nothing is connected to the SW above the "corner" freq., no current flows there.

Edit: fixed typos

adharvey · 31st March 2007, 02:22 PM

That makes sense.

I'll do that.

I've got to ask though...Why do they have the speaker out on the subs then?

Thanks.

Eli Duttman · 31st March 2007, 02:36 PM

Quote:

Why do they have the speaker out on the subs then?

To save money on cables and/or tradition. With "midfi" SS gear it probably matters little. The arrangement I suggested keeps the SW's crossover out of the signal path above the "corner" freq.

31st March 2007, 01:29 PM	#1
adharvey diyAudio Member Join Date: May 2003 Location: Thursday Island, Torres Strait (still Queensland), Australia	Subwoofer connections Howdy, I have a small single ended amp, it uses two 6p13p Chinese valves (tubes) as the outputs. I have two home made busch horn speakers and I'd like to add a sub. I don't have a preamp and run the cd player straight into the amp. How do I know the impedance of the sub hi-level inputs. I guess that they should be ok, as they are designed to be inline with the speakers. I'm just a little concerned that I might be putting the sub in parallel with my speakers and dropping the impedance. Should I be? Thanks in advance.

31st March 2007, 02:14 PM	#2
Eli Duttman diyAudio Member Join Date: Apr 2004 Location: Plainsboro, NJ	Relax! Just be sure to buy a SW with speaker level I/Ps. You connect the SW in parallel with the main speakers. Do NOT "daisy chain". Below the "corner" freq., the SW's crossover presents a relatively high impedance load to the power amp. As a result, the power amp's load is completely dominated by the main speakers. Since nothing is connected to the SW above the "corner" freq., no current flows there. Edit: fixed typos __________________ Eli D.

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31st March 2007, 02:22 PM	#3
adharvey diyAudio Member Join Date: May 2003 Location: Thursday Island, Torres Strait (still Queensland), Australia	That makes sense. I'll do that. I've got to ask though...Why do they have the speaker out on the subs then? Thanks.

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