Subwoofer hunt

Apologies in advance to spoutjack...

@almarg ...So if planning to run from the 4 or 8 ohm output taps of an amp into the speaker level connections of a powered sub and the input impedance here, as per the mftr. spec, is 2000 ohm (SVS for their SB1000), the output impedance of the amp would be 0.002 - 0004 of the sub's input impedance depending on the tap used.  Do these values still qualify as insignificant fractions of the much-lower-than-100K-ohm SVS input impedance?  I would think so, but not certain.  Thanks for taking a look.   

@almarg - 
Al, in case of a formatting error to your name in the request above, I'm re-sending.  If you would be so kind, please see my question there.  Thanks in advance. 

@almarg
Very helpful. Thank you. I also took notes from your line level input discussion in reply to rbschauman’s "Help Wanted Bass" thread.

Regarding the true output impedance of my tube amps, unfortunately I’ve not seen info about damping factor in the mftr. specs. There’s not a lot of love for Stereophile in some quarters, but if you are fortunate enough to own a nice piece of gear they’ve reviewed, the measurements section is a great resource going forward.

BTW - I too was surprised about that speaker level impedance spec for the SVS SB1000.  Double checked it.  Best I can tell, barring a typo on their part, 2K Ohm is the value.  

Thanks again.

@bob_reynolds 
Yes...thanks for confirming Bob.  The SVS web site is indeed where I got the number I used.  Expect I'll be talking to SVS next week...back and forth between an SV1000 or SV2000.  Will try to remember to ask about that speaker level impedance value.  The good news is, if a 2K Ohm value won't affect the power amps, a 200K value wouldn't either.  

Al - Your responsiveness and generous help are some of the best things about Audiogon.

Thank you.

@almarg  
@bob_reynolds 

Gents - took delivery of a pair of the above discussed SVS SB1000 subs.  Currently running them using speaker level input from the amps.  Running the loudspeakers themselves full range.  

I'm using mono blocks now.  In the future, I'll likely use an integrated that might be located 8 - 10' away from the subs.  To keep cable runs short, can I connect the subs' high level inputs to the terminals of my speakers (located right next to the subs)? OR is it essential to connect the subs at the amp?

Thanks yet again for your time. 

Thanks for the input Bob.  The only reason for wanting to keep the cables short was simply "tidiness"...cable management, if you will.  Short will let me avoid having a lot of extra length laying around.

FWIW - am going to order a few feet of a Belden 5000 series 12 gauge from Blue Jeans Cable (along with some spade terminations).  

oleschool - I did try using pre-outs from the pre-amp.  I thought that would be the way to go.  BUT when I experimented trying the high level inputs...connecting subs to amp - I immediately thought things sounded better hooked up that way.  Go figure.  

@spoutjack 
I hope the answers to the questions I've asked are helpful to you.  

@bob_reynolds

Hello again Bob. I prefer banana plugs myself but that option is already taken at both the amp and the speaker terminals by the normal speaker wire. It’ll have to be spades/spades I think.

Should be able to wrangle a short length (3-5'?)of the Belden 10 gauge and get it to play nice. If it’s stiff enough, might even help keep it off the carpet.

@spoutjack -
I expect there will be 2 pairs of speaker level/high level inputs on the sub. A pair (+/-) for the left channel and a pair for the right. Check your sub mftr's. info. to confirm.

@bob_reynolds 
Good suggestion on the 2 way banana plug.  I'll take a look at that.
We ain't all that particular about things that don't make an audible difference.  Exactly how stiff is that Belden 12 gauge?  Not like coat hangers, I hope.  I might need to make a 90 or 180 degree bend...but talking mid-length - not near an end, so the bend can be gradual.  Let me know what you think.  Thanks.