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buying a pair of Polk SDA 2A speakers that require amp with common ground

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Jim Pittsburgh:
OK I borrowed a better meter... testing the ground between the two main speakers, with the dial set at 200 the reading was .8   set at 2K  it read  .001
 am I reading it correctly? so it is a common????

ataudio:
According to the schematic all negative speaker terminals are tied to chassis ground....your ohm check seems to confirm
this as well.  You could try one more check.  Put one lead on a NEG terminal and the other meter lead on a bare metal
spot on the receiver.  This should show a <1 ohm as well.   Any NEG terminal to any NEG terminal to chassis should be less
than 1 ohm. 

schwarcw:

--- Quote from: Jim Pittsburgh on November 06, 2013, 05:43:46 PM ---OK I borrowed a better meter... testing the ground between the two main speakers, with the dial set at 200 the reading was .8   set at 2K  it read  .001
 am I reading it correctly? so it is a common????

--- End quote ---

Use the meter to test the resistance at the two negative outputs on the amp.  if your reading around 1 ohm, you have a common ground amp.  Most receivers are common ground.

A word of advice from a long time SDA owner, that receiver won't do those speakers justice.  I would use a separate preamp/amp combo.  You'll need more than 100 wpc to make them sound their best.  Those speakers are around 5 to 6 ohms, most receivers don't do well with a speaker less than 8 ohms.  If you have a set of preouts on your receiver, run those into a separate amp.  Those Polks will sound much better. 

Placement is also very important.  They should be set up in an equilateral triangle, no toe in.  Each speaker should be two or more feet from the side wall to sound best.  The speakers should be around 6 - 10" from the wall directly behind them. 

Set them up right and give them some good clean power and they will amaze you!

Good luck!

F1nut:
There isn't a receiver made that isn't common ground.

As Carl indicated, those speakers are actually 4 ohm nominal and will kill that receiver given any volume.

Jim Pittsburgh:
thanks all... your thoughts and expertise are very much appreciated..... both  the education and  search continue lol 

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