Using The Speaker Level Inputs On A Sub

[itchitch 4,651]

What effect does this method have on an amplifier's load?

If the speakers that are connected to the amp are 8ohm does the amp still only see an 8ohm load?

 

 

[wrf 5,217]

Schematics for the TS EQ sub show a load of only 56K.  Should be just fine.

 

Likely the same for any other sub.

 

 

 

 

[itchitch 4,651]

Thank Wayne!

[Chops 694]

Yes, too high for the amp to even notice, but the benefit is that the sub would then have the "sound" of the amp feeding it.

[zumbini 6,153]

On the downside, the amp will be wasting power producing a full range output, and the noise level will be higher.

 

I only use a speaker level signal as a last resort. IMHO you are better off twinning your pre outs to drive the sub.

[itchitch 4,651]

Dom,

 

I have been looking at some local ads for used subs. One of them only had LFE and speaker level inputs. I had always been curious about this method of connection. Another had only speaker level connections but had a variable high pass feature. 

 

Thanks!

 

(Dom autocorrects to DoN ?)

[UncleMeat 1,174]

Make sure you don't use a bridged-mono amp, or an inverting amp.  On the my Sunfire subs the signal ground of the speaker level input is also an earth ground.  The manual says not to; but who reads that first??!!

Edited March 9, 2018 by UncleMeat

[zumbini 6,153]

I assumed from your original post that it was (would be) an active sub. Passive subs and sub/sat system are intended to be driven directly by an amp.

 

The Design Acoustic DA-30's (a DA-20LF sub with 2 DA-10 satellites) I bought in the late 70's and now use in my shop are set up that way (full range speaker-level signal to the sub, barrier strip outputs to the satellites. They aren't earth-shakers but sound excellent at reasonable listening levels.

 

 

[itchitch 4,651]

I only used the Sunfire for illustration purposes.

 

Dom... it was an active sub question. 

Thanks 

Edited March 9, 2018 by itchitch