Hello
Yesterday I changed the connections between Stereoknight Enigma preamplifier and my Threshold SA/4e S/550e that I use in bi-amping system with B&W 802D through a connection of unbalanced RCA to balanced XLR.
The balanced cables are pro Extron Electronic with Neutrik connectors while the unbalanced cables are more complex DIY cables (I don't know the specs) homemade by a friend.
I have noticed some changes in the perceived sound:
1 - The sound is slightly drier and lost a bit 'of body and thick, it all seems a little' thinner.
2 - The bass is less clear, with less impact and the attacks of the low notes are less precise and less fast.
What can cause this problem? How can it be solved?
In a few days I'll have to keep away from the amplifiers pre-amp so I will need about 6 meters of cable which should be, necessarily, balanced type.
A friend of mine who owns a s/550e told me that he found the same problem, but fortunately he does not need to use long balanced cables...
So I need an explanation to this problem and possibly a solution. It may be helpful to change the unbalanced input of the amplifier circuit (if I remember correctly the final threshold do not have a truly balanced circuitry)? If you can how?
Thanks in advance
Giovanni
Yesterday I changed the connections between Stereoknight Enigma preamplifier and my Threshold SA/4e S/550e that I use in bi-amping system with B&W 802D through a connection of unbalanced RCA to balanced XLR.
The balanced cables are pro Extron Electronic with Neutrik connectors while the unbalanced cables are more complex DIY cables (I don't know the specs) homemade by a friend.
I have noticed some changes in the perceived sound:
1 - The sound is slightly drier and lost a bit 'of body and thick, it all seems a little' thinner.
2 - The bass is less clear, with less impact and the attacks of the low notes are less precise and less fast.
What can cause this problem? How can it be solved?
In a few days I'll have to keep away from the amplifiers pre-amp so I will need about 6 meters of cable which should be, necessarily, balanced type.
A friend of mine who owns a s/550e told me that he found the same problem, but fortunately he does not need to use long balanced cables...
So I need an explanation to this problem and possibly a solution. It may be helpful to change the unbalanced input of the amplifier circuit (if I remember correctly the final threshold do not have a truly balanced circuitry)? If you can how?
Thanks in advance
Giovanni
The input on balanced was a true 600 Ohms on these if I remember correctly. This can be tough to drive and alter the sound some. It could be increased though.
Hi
If I remember S/500 has only unbalanced inputs, S/550e and SA/4e are different from S/500, they have balanced inputs too. With unbalanced inputs the sound is OK!
Thanks
Giovanni
How can I increase the input impedance? Where can I find the service manuals of those Amplifiers?
Thanks
Giovanni
You can check input impedance with an Ohm meter on this and verify.
It can be increased by changing R1 on the rear panel board and R2 on the front end board.
It can be increased by changing R1 on the rear panel board and R2 on the front end board.
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