Alright, I'm in way to many posts on here for good, I'm getting so tired of this game.
I ran an rca out from my computer soundcard, to an active crossover, and out of the 1/4 jack of that to the 1/4 jack of my amplifier.
I ... STILL! Get VERY quiet levels. These are even just tip sleeve plugs now! Not the tip ring sleeve ones.
Someone tell me what is wrong!!?! NADY SPA 2400
I ran an rca out from my computer soundcard, to an active crossover, and out of the 1/4 jack of that to the 1/4 jack of my amplifier.
I ... STILL! Get VERY quiet levels. These are even just tip sleeve plugs now! Not the tip ring sleeve ones.
Someone tell me what is wrong!!?! NADY SPA 2400
Nady SPA 2400 Low Sound Level Problem HELP! - YouTube
Here I made a video. It's really long but should provide all the information if you skip around or watch it... Thank you !
Here I made a video. It's really long but should provide all the information if you skip around or watch it... Thank you !
Look at the back of that amplifier again, its balanced inputs only. You are feeding the left channel signal (both positive and negative) into the + portion of a single channel input, the right channel is being fed into the - portion of a single channel input.
You cannot feed a stereo signal into any connector on that amplifier, you have to feed mono into each connector for stereo.
From the manual:
The 1/4” TRS phone jacks can also be used for
unbalanced inputs. For TRS phone plugs, simply connect
the unused side of the balanced input to ground. For 1/4”
TS phone plugs, no change is necessary for compatibility
with this input. Balanced input signals are recommended
as they are less prone to AC hum. For long cable runs a
source of less than 600 ohms output impedance is needed
to avoid signal loss. For short cable runs an unbalanced
signal input should be suitable.
For stereo (two-channel) operation, use the inputs for both
CH-A and CH-B; for parallel or bridged mono operation,
use only CH-A input. (See 13-MODE SELECTOR
SWITCHES below for more explanation.)
You cannot feed a stereo signal into any connector on that amplifier, you have to feed mono into each connector for stereo.
From the manual:
The 1/4” TRS phone jacks can also be used for
unbalanced inputs. For TRS phone plugs, simply connect
the unused side of the balanced input to ground. For 1/4”
TS phone plugs, no change is necessary for compatibility
with this input. Balanced input signals are recommended
as they are less prone to AC hum. For long cable runs a
source of less than 600 ohms output impedance is needed
to avoid signal loss. For short cable runs an unbalanced
signal input should be suitable.
For stereo (two-channel) operation, use the inputs for both
CH-A and CH-B; for parallel or bridged mono operation,
use only CH-A input. (See 13-MODE SELECTOR
SWITCHES below for more explanation.)
Last edited:
I have tried the stereo mode. I have also tried alternative cables and adapters as well!
Due to the amplifier on the floor working with unbalanced RCA signal, I can't use the exact same cords, a male 3.5 to male RCA. I have tried reversing that set up though... Same results as this.
From the manual
"The 1/4” TRS phone jacks can also be used for
unbalanced inputs. For TRS phone plugs, simply connect
the unused side of the balanced input to ground. For 1/4”
TS phone plugs, no change is necessary for compatibility
with this input."
I have used my active crossover which takes RCA signal and splits it in two 1/4 outs (Right and left) I then use 2 "guitar" cables (TS) and stereo mode on my amp. Still quiet levels! Even with my crossover boosting the signal to max.
I've tried virtually everything but
1. Balanced signal (or XLR)
2. RCA to 1/4 cables. (Sold by Hosa, on its way in the mail)
"For TRS phone plugs, simply connect
the unused side of the balanced input to ground"
^^What does this mean__ ? ^^
And maybe it is shorting out!? If so, is it an easy repair?
Should I keep the amp and fix it? Or is it possibly trashed?
Due to the amplifier on the floor working with unbalanced RCA signal, I can't use the exact same cords, a male 3.5 to male RCA. I have tried reversing that set up though... Same results as this.
From the manual
"The 1/4” TRS phone jacks can also be used for
unbalanced inputs. For TRS phone plugs, simply connect
the unused side of the balanced input to ground. For 1/4”
TS phone plugs, no change is necessary for compatibility
with this input."
I have used my active crossover which takes RCA signal and splits it in two 1/4 outs (Right and left) I then use 2 "guitar" cables (TS) and stereo mode on my amp. Still quiet levels! Even with my crossover boosting the signal to max.
I've tried virtually everything but
1. Balanced signal (or XLR)
2. RCA to 1/4 cables. (Sold by Hosa, on its way in the mail)
"For TRS phone plugs, simply connect
the unused side of the balanced input to ground"
^^What does this mean__ ? ^^
And maybe it is shorting out!? If so, is it an easy repair?
Should I keep the amp and fix it? Or is it possibly trashed?
Oh, a Pyle PTA1400 is on its way. (Yes I know, it's a bad amp) ... I'm using it to power some really weak speakers.
It takes 1/4 as well. I'll be able to do some trouble shooting when it's here.
I also have an Ashly CFT 1800. It's heat syncs fell of in mailing. If I recall, it had the SAME problem this one does though! (I tested it for 20 seconds to make sure it powered up)
It takes 1/4 as well. I'll be able to do some trouble shooting when it's here.
I also have an Ashly CFT 1800. It's heat syncs fell of in mailing. If I recall, it had the SAME problem this one does though! (I tested it for 20 seconds to make sure it powered up)
And thanks again guys, truly appreciate the interest in helping a new member like myself! Great vibes here. I'm really excited to get into the audio business.
I am building this set up for 4.1 audio
I'm really excited to make a career out of music, electronics, speakers, and innovation! ... But I'm just starting ...
I am building this set up for 4.1 audio
I'm really excited to make a career out of music, electronics, speakers, and innovation! ... But I'm just starting ...Thanks for the link! I read up, I'll have to read it again. What I picked up directly was this:
"Line levels and their nominal voltage levels. Use Nominal level Nominal level, VRMS Peak Amplitude, VPK ARD, Germany +6 dBu 1.550 (approximate) 2.192 (approximate) USA professional audio +4 dBu 1.228 (approximate) 1.737 (approximate) Consumer audio −10 dBV 0.316 0.447"
Now, I don't know much about electronics yet. But does this mean that my signal is literally 3 times too weak for this amplifier (Since it is professional grade) ?
Or am I not taking something into account?
I think you may be mixing TRS (3 tip) in a mono jack. Sometimes you can pull the jack out slightly and cheat a bit.
There are a lot of RCA line level “boxes” to XLR these days: RDL, Rolls, powered – unpowered just don’t mixed up and purchase a ground loop isolator box (they look they same).
MCM is a good pace to save some dough $$
http://www.mcmelectronics.com/product/555-8485
Ebay amp...Risky, you didn’t mention if was new or used.
There are a lot of RCA line level “boxes” to XLR these days: RDL, Rolls, powered – unpowered just don’t mixed up and purchase a ground loop isolator box (they look they same).
MCM is a good pace to save some dough $$
http://www.mcmelectronics.com/product/555-8485
Ebay amp...Risky, you didn’t mention if was new or used.
I'm pretty sure Rane has a technical note on their website about connecting balanced and unbalanced. If you have (or can download) the manual for the amp, it should have a page explaining how to connect unbalanced sources.
Or, with one quad op-amp you can make a stereo balanced line driver. Wire 2 sections as inverting buffers, two as non-inverting.
Or, with one quad op-amp you can make a stereo balanced line driver. Wire 2 sections as inverting buffers, two as non-inverting.
This means you have to add a jumper from pin 1 to pin 3 on the xlr jacks to use the TRS plugs. A piece of bent thick copper wire can be used, or you can purchase little plug cap things that do the same job.
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