or Connect
Head-Fi.org › Forums › Help and Getting Started › Introductions, Help and Recommendations › Connecting unbalanced output from DAC to studio monitors
New Posts  All Forums:Forum Nav:

Connecting unbalanced output from DAC to studio monitors

post #1 of 7
Thread Starter 

Hi, I have a pair of JBL LSR305 monitors that I want to connect to my DACport LX (unbalanced TRS output).  The JBL accepts XLR and 1/4 inch TRS inputs.  Can I directly connect the unbalanced output from the DAC to the balanced XLR inputs on the speakers using a cable like this?  

http://www.amazon.com/HOSA-STEREO-3-5mm-TWO-XLR/dp/B000068OEP/ref=sr_1_32?s=musical-instruments&ie=UTF8&qid=1337929435&sr=1-32&tag=vglnk-c1001-20

 

Or is it more sensible to use the TRS inputs with this kind of cable (the JBL website implies that the TRS is balanced as well)?

http://www.amazon.com/Hosa-STP203-Dual-Cable-9-75/dp/B000068O1P/ref=sr_1_1?s=musical-instruments&ie=UTF8&qid=1403503086&sr=1-1&keywords=1%2F4+to+dual+1%2F4

post #2 of 7
Quote:
Originally Posted by Za Warudo View Post
 

Hi, I have a pair of JBL LSR305 monitors that I want to connect to my DACport LX (unbalanced TRS output).  The JBL accepts XLR and 1/4 inch TRS inputs.  Can I directly connect the unbalanced output from the DAC to the balanced XLR inputs on the speakers using a cable like this?  

 

Or is it more sensible to use the TRS inputs with this kind of cable (the JBL website implies that the TRS is balanced as well)?

http://www.amazon.com/Hosa-STP203-Dual-Cable-9-75/dp/B000068O1P/ref=sr_1_1?s=musical-instruments&ie=UTF8&qid=1403503086&sr=1-1&keywords=1%2F4+to+dual+1%2F4

 

You really want to use the Hosa STP203 TRS To Dual 1/4 Cable, I'm guessing an "unbalanced" output does not output enough voltage for a "balanced" input (XLR)

Also there is a setting on the back of the LSR305, choice between +4 or -10, make sure it's set to -10 for an unbalanced connection.

post #3 of 7
Thread Starter 
Quote:
Originally Posted by PurpleAngel View Post
 

 

You really want to use the Hosa STP203 TRS To Dual 1/4 Cable, I'm guessing an "unbalanced" output does not output enough voltage for a "balanced" input (XLR)

Also there is a setting on the back of the LSR305, choice between +4 or -10, make sure it's set to -10 for an unbalanced connection.

Thanks!  Why would the output not have enough voltage for XLR vs the TRS if either way I'm connecting one end to the DAC and the other 2 ends to the speakers?  Also when is the +4 input sensitivity appropriate and when is the -10 sensitivity appropriate?  Is that just for adjusting the volume?

post #4 of 7
Quote:
Originally Posted by Za Warudo View Post
 

Thanks!  Why would the output not have enough voltage for XLR vs the TRS if either way I'm connecting one end to the DAC and the other 2 ends to the speakers?  Also when is the +4 input sensitivity appropriate and when is the -10 sensitivity appropriate?  Is that just for adjusting the volume?

 

From my understanding a balanced output is two positive channels (twice the power of a unbalanced connection) and one ground line.

So if you take an imbalanced output and send it to a balanced input, the each of the two balanced inputs will only receive half of the expected power.

Per the LSR305 manual, +4 is when using a balanced input, and -10 for unbalanced, but why is beyond my pay grade.

post #5 of 7
Thread Starter 
Quote:
Originally Posted by PurpleAngel View Post

 

From my understanding a balanced output is two positive channels (twice the power of a unbalanced connection) and one ground line.

So if you take an imbalanced output and send it to a balanced input, the each of the two balanced inputs will only receive half of the expected power.

Per the LSR305 manual, +4 is when using a balanced input, and -10 for unbalanced, but why is beyond my pay grade.

 



The JBL website says that the TRS inputs are also balanced. Wouldn't that make it the same as the XLR inputs? So if they receive half of the expected power then the speaker wouldn't be able to get enough volume?
post #6 of 7
Quote:
Originally Posted by Za Warudo View Post
 
Quote:
Originally Posted by PurpleAngel View Post
 

 

From my understanding a balanced output is two positive channels (twice the power of a unbalanced connection) and one ground line.

So if you take an imbalanced output and send it to a balanced input, the each of the two balanced inputs will only receive half of the expected power.

Per the LSR305 manual, +4 is when using a balanced input, and -10 for unbalanced, but why is beyond my pay grade.

 



The JBL website says that the TRS inputs are also balanced. Wouldn't that make it the same as the XLR inputs? So if they receive half of the expected power then the speaker wouldn't be able to get enough volume?

 

In the LSR305/308 manual, I think on page 7, it says to use the -10 setting, when using an unbalanced (TRS) connection.

I'm guessing JBL expects the LSR305s to normally be used with a balanced connection (XLR or TRS) , but offers an option (-10) for those few times they might be used with an unbalanced connection.

From my understanding one of the reasons for using a balanced connection is it allows you to use a really long cable and still get the studio monitor to function properly.

Where if your using a unbalanced connection, but with a shorter cable, the JBL can still function well enough.

But i'm just making my best guess on this stuff.

 

You might get better answers asking on this forum section.

http://www.head-fi.org/f/21/cables-power-tweaks-speakers-accessories-dbt-free-forum

post #7 of 7
Thread Starter 
Thanks a lot for your help! I'll looking into it at that section of the forums.
New Posts  All Forums:Forum Nav:
  Return Home
Head-Fi.org › Forums › Help and Getting Started › Introductions, Help and Recommendations › Connecting unbalanced output from DAC to studio monitors