After extensive listening sessions I decided to remove the buffer in front of my Charlize2. I definitely prefer the sound without it : maybe a little less mellow / musical but more precise / defined and this is what I like.
I consequently decided that I could live with a small DC (1 mV on left, 4 mV on right) at the input of my "capless" Charlize2. Hope this will not cause any harm.
I consequently decided that I could live with a small DC (1 mV on left, 4 mV on right) at the input of my "capless" Charlize2. Hope this will not cause any harm.
An externally hosted image should be here but it was not working when we last tested it.
Reviving an old thread. I recently picked up a Charlize 2 amp with SLA battery. It came with the nice Obbligato caps, which I have used and liked in past, but the input-capless concept is tempting me.
From the old post:
"You simply connect your source ground to the BIASCAP pin of the chip instead of the analog ground. This requires you to isolate the source ground and the power supply ground and Yeo does state that in the description."
So when I flip over the board to reveal 2020 pins, how do I identify the BIASCAP pin? And I connect ground of both left and right source to one pin?
This Charlize actually sounds quite good already, surprisingly similar in clarity and tone to my tweaked 2A3SET but I would like to bring out a little more micro-resolution AND smoothness at the same time (a Tall order I know).
Thanks. Will do.
What would be an "acceptable" DC offset at the speaker terminals?
I plan to hook it up to a 95dB/7Ohm nominal speaker and also Stax Omega II Mk1 (via Stax SRD7 MkII). Will the Stax step-up transformer block DC anyway?
I went ahead and checked DC offset at speaker terminasl before doing any mods. Right channel measured at 6.6 mV, but the left channel measured at 101.6 mV!
I couldn't find anything obviously burnt, blown, or broken. What could be causing this large DC offset in left channel, and more importantly, how can I fix it?
I couldn't find anything obviously burnt, blown, or broken. What could be causing this large DC offset in left channel, and more importantly, how can I fix it?
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
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There are a few threads at diyparadise that says Charlize only guarantees max DC offset of 150 mV!
charlize 2 and dc offset
DC-offset in Charlize.
charlize mod?
I'm still very concerned about the 15X different in DC offset between left and right, especially since I plan to use Charlize II to power my two very expensive electrostat headphones vis Stax SRD-7 Mk II transformer.
I also plan to buy a pair of Quad ESL57 when I can find a pair in good condition nearby. Charlize's high DC offset is apparently "OK" for most speakers but bad for electrostats.
charlize 2 and dc offset
DC-offset in Charlize.
charlize mod?
I'm still very concerned about the 15X different in DC offset between left and right, especially since I plan to use Charlize II to power my two very expensive electrostat headphones vis Stax SRD-7 Mk II transformer.
I also plan to buy a pair of Quad ESL57 when I can find a pair in good condition nearby. Charlize's high DC offset is apparently "OK" for most speakers but bad for electrostats.
Please try shorting the signal 'ground' to the signal input and measure again. If the output offset voltage remains the same, it is due TA2020 silicon.
Do you mean on the Charlize, short the Charlize RCA's ground with Charlize RCA center "signal"? With my DAC not connected to Charlize?
Yes! That's correct. This is because any small amount of DC from your DAC will be amplified by Charlize.
OK, I re-measured with source signal and ground shorted and there's no real difference in DC offset.
Another question would be, what would happen if I did the no-capacitor mod to my Charlize II by connecting source ground to BIASCAP of TA2020? Would the DC offset increase, decrease, or not change much?
I measured my DAC, and it has around 3 mV DC offset. Another component I would hook up the Charlize to is my Bryston 10B active crossover, which has ZERO (!) DC offset. Gotta love that Bryston engineering and quality control!
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confusion
hello. i am very old in years and very new to this sort of thing. so please forgive the elementary nature of my question. i cannot figure out the warning given about the ground problem in charlize 2, other than the results of a mistake would be dire. it seems to me that the instructions given by keo are contradictory, so i would be very grateful if anyone could enlighten me. thanks much.
hello. i am very old in years and very new to this sort of thing. so please forgive the elementary nature of my question. i cannot figure out the warning given about the ground problem in charlize 2, other than the results of a mistake would be dire. it seems to me that the instructions given by keo are contradictory, so i would be very grateful if anyone could enlighten me. thanks much.
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