Head-Fi.org › Forums › Equipment Forums › Computer Audio › BX8a speakers arent very loud. help?
New Posts  All Forums:Forum Nav:

BX8a speakers arent very loud. help? - Page 2

post #16 of 28

Using a balanced connections increases sound by 3db, which is doubling the sound. so there is more volume or rather gain available. 

 

"Fully balanced internal circuitry has been promoted as yielding 3dB better dynamic range"

 

http://en.wikipedia.org/wiki/Balanced_audio

 

 "Using the decibel scales, every time the sound energy doubles, the measured level increases by 3dB." Here is an article the describes the volume doubling.

http://www.metrosonics.com/Support/Faqs/dos_faq.htm


Edited by TheRH - 3/26/12 at 10:57am
post #17 of 28
Thread Starter 

Just got the lexicon in the mail.... Holy guac.... that is one HUGE difference in sound quality. Thanks for all the help people!

post #18 of 28

Are you running balanced or un-balanced?

post #19 of 28
Thread Starter 

balanced

post #20 of 28

Awesome, so how are you liking the new set up?

post #21 of 28

With the y adapter you were using you were sending 2 unbalanced signals Left & right to the balanced input of each speaker. When you do that all you will hear is the difference signal as in L minus R not the real  signal that is supposed to drive the amp. That will cause the signal to sound very weak. If you feed a true balanced signal to the balanced input you get double the voltage swing which  is actually 6 db gain not 3db providing you are feeding the + and - of a differential input amp however this can be compensated for in the circuit resulting in no gain if desired, just an improved interference & noise spec is all. The BX8a probably uses a differential amp at it's input. My earlier BX5's do.

 

Sounds like you got that fixed now though. Just thought I could give a better explanation as to what was really happening to cause the weak sound.

 

The proper way to feed an unbalanced signal to the balanced input is to use a RCA to tip sleeve I.E. two conductor phono plug, not tip ring sleeve which is 3 conductor phono plug. The long sleeve of the tip sleeve 2 conductor plug grounds the unused input resulting in lower noise.


Edited by germanium - 3/30/12 at 3:45am
post #22 of 28

We already had this discussion. lol

post #23 of 28

The information I gave was largely for the benefit of others who might decide to try studio monitors with consumer based soundcards. I also gave the real reason as to why he was getting such low sound which nobody really addressed in truth which is that all inphase sound that was volume matched was being cancelled not just reduced. All he was hearing was the difference signal which nobody else pointed out. If he had gotten a strong out of phase signal as does happen in some music he would have been blasted out of the room or possably damage his speakers as they would have been cranked to the max to get much of any sound that was in phase.

 

I acknowledged that the issue was fixed in my previous post though it could have been fixed much cheaper with just wiring changes I recommend however I did come late to the conversation to make any difference to the OP, however it may help someone else in the future. I'm not saying it was bad to go with a source that has balanced outputs. If you have the money go for it however just because you can use the balanced wiring does not nessessarily guarantee better sound than the unbalanced connection, Often it does but not always. Ive been running my monitors unbalanced for years with no real issues. Note that most of the time balanced connection are converted to unbalanced inside the amps anyway as they are in my speakers & likely the BX8a's as well. 

post #24 of 28

The proper way to connect and use active studio monitors is to connect the soundcard/DAC RCA line-out to the the monitor's RCA line-in, or the soundcard/DAC XLR line-out to the monitor's XLR line-in.  All other hacks are suboptimal solutions.

post #25 of 28


 

Quote:
Originally Posted by germanium View Post

The information I gave was largely for the benefit of others who might decide to try studio monitors with consumer based soundcards. I also gave the real reason as to why he was getting such low sound which nobody really addressed in truth which is that all inphase sound that was volume matched was being cancelled not just reduced. All he was hearing was the difference signal which nobody else pointed out. If he had gotten a strong out of phase signal as does happen in some music he would have been blasted out of the room or possably damage his speakers as they would have been cranked to the max to get much of any sound that was in phase.

 

I acknowledged that the issue was fixed in my previous post though it could have been fixed much cheaper with just wiring changes I recommend however I did come late to the conversation to make any difference to the OP, however it may help someone else in the future. I'm not saying it was bad to go with a source that has balanced outputs. If you have the money go for it however just because you can use the balanced wiring does not nessessarily guarantee better sound than the unbalanced connection, Often it does but not always. Ive been running my monitors unbalanced for years with no real issues. Note that most of the time balanced connection are converted to unbalanced inside the amps anyway as they are in my speakers & likely the BX8a's as well. 


I disagree with a balanced connection being converted to an un-balanced connection. Though that main issue he was having was a low output signal. And now the issue has been corrected, and I did not mean he would get a better sound for say, but that he would get less EMI, as well as an extra 3db over unbalanced, resulting is 6db of gain.

 


Edited by TheRH - 3/31/12 at 11:35pm
post #26 of 28


 

Quote:
Originally Posted by Mauricio View Post

The proper way to connect and use active studio monitors is to connect the soundcard/DAC RCA line-out to the the monitor's RCA line-in, or the soundcard/DAC XLR line-out to the monitor's XLR line-in.  All other hacks are suboptimal solutions.



Correct, use the same connection type from one source to the other, RCA to RCA, or a RCA to TS, or a balanced to balanced (TRS to TRS, XLR to TRS, or XLR to XLR). I am running customs pair of TRS to TRS, and have noticed an increase of 6db from when I was using TS to TS, as well as a lowering of the noise floor, a major plus. And for now one I am only running balanced to balanced.


Edited by TheRH - 3/31/12 at 11:34pm
post #27 of 28
Quote:
Originally Posted by TheRH View Post


 


I disagree with a balanced connection being converted to an un-balanced connection.

 



I am not saying that the connection from the source to the amp becomes unbalanced but once it gets to the input amp the differential balanced signal is coverted by the input amp to an unbalanced signal to all componants past the input amp inside the speakers. I do know what I'm talking about here as I have modded similar speakers from the same brand & that is how they are set up inside. The balanced signal does not go past the input amp, it is converted to a single-ended/unbalanced signal. There are important reasons why this is done. One of the reasons is volume control is much easier to impliment properly in the unbalanced domain as tracking of volume controls made for balanced connnections are more complex & subject to improper balance if you try to do it cheaply, in other words some of the benefits of the balanced connection is lost if you do a balanced volume control improperly/cheaply. It will be better to control the volume in the unbalanced domain. Many preamps that have balanced inputs & output actually process the signal inside in the unbalanced domain for this reason & convert back to balanced at the output buffers.

 


Edited by germanium - 4/1/12 at 12:10am
post #28 of 28
Quote:
Originally Posted by germanium View Post



I am not saying that the connection from the source to the amp becomes unbalanced but once it gets to the input amp the differential balanced signal is coverted by the input amp to an unbalanced signal to all componants past the input amp inside the speakers. I do know what I'm talking about here as I have modded similar speakers from the same brand & that is how they are set up inside. The balanced signal does not go past the input amp, it is converted to a single-ended/unbalanced signal. There are important reasons why this is done. One of the reasons is volume control is much easier to impliment properly in the unbalanced domain as tracking of volume controls made for balanced connnections are more complex & subject to improper balance if you try to do it cheaply, in other words some of the benefits of the balanced connection is lost if you do a balanced volume control improperly/cheaply. It will be better to control the volume in the unbalanced domain. Many preamps that have balanced inputs & output actually process the signal inside in the unbalanced domain for this reason & convert back to balanced at the output buffers.

 


Ok, I though you meant at the input section, on the amp section, yes, this is true.

 

New Posts  All Forums:Forum Nav:
  Return Home
  Back to Forum: Computer Audio
Head-Fi.org › Forums › Equipment Forums › Computer Audio › BX8a speakers arent very loud. help?