Re: My Dact pre is ready
Pasi, very nice. So you connect the inputs to the Orion filters and on the filters output you connect the Dact stepped att.? Do the filters have enough headroom for high input signals?
Pasi P said:My 6-ch Dact + Orion filter combination is ready for first test. Bent audios remote is installed also. Wiring needs cleaning and front plate some leds.
Sound is soo good
Clarity is in new level.
I had before Alps blue based passive.
I dont know is improvement coming more Dact or using volume control (6-ch) after active filter.
Pasi, very nice. So you connect the inputs to the Orion filters and on the filters output you connect the Dact stepped att.? Do the filters have enough headroom for high input signals?
Re: Re: My Dact pre is ready
Yes, that is the connection.
I do not remember now what is max. input voltage for Orion filter but in sources i use, no any broblems anyway.
PS. I heard soft "klick" from loudspeaker when turning Dact at higher volumes. Do you think this is normal?f
Bgt said:
Yes, that is the connection.
I do not remember now what is max. input voltage for Orion filter but in sources i use, no any broblems anyway.
PS. I heard soft "klick" from loudspeaker when turning Dact at higher volumes. Do you think this is normal?f
Re: Re: Re: My Dact pre is ready
Maybe when increasing the volume you're also increasing the possible dc offset. I heard it also sometimes, especially when playing mp3's. Some mp3's have a terrible low frequency drift. I notice this when looking at the woofer cone. This is sometimes a drawback of dc coupling. Mp3's(128kb) sound horrible anyway. The better your system the more critical your source becomes.
Pasi P said:
Maybe when increasing the volume you're also increasing the possible dc offset. I heard it also sometimes, especially when playing mp3's. Some mp3's have a terrible low frequency drift. I notice this when looking at the woofer cone. This is sometimes a drawback of dc coupling. Mp3's(128kb) sound horrible anyway. The better your system the more critical your source becomes.
Bert,
Sorry, I mean this klick only when adjusting volume. While listening to any position of dact, nothing unusual.
Sorry, I mean this klick only when adjusting volume. While listening to any position of dact, nothing unusual.
Pasi, this is what I meant. You here a click when moving the stepper. Not when the stepper is at rest.
Bert,
I see.
I measured DC offset 50mV (!) left and 11mV right channel from Orion filter midrange output. Tweeter and woofer outputs are below 1mV.
Maybe there is something wrong with my Orion midrange filter? I have to ask from Siegried, how much DC is acceptable.
CD-player output DC is below 1mV.
I see.
I measured DC offset 50mV (!) left and 11mV right channel from Orion filter midrange output. Tweeter and woofer outputs are below 1mV.
Maybe there is something wrong with my Orion midrange filter? I have to ask from Siegried, how much DC is acceptable.
CD-player output DC is below 1mV.
Bgt said:
I asked that from Linkwitz and he said that 50mV is too much (below 10mV typical, 30mV max. DC-offset) and possibly one op-amp OPA2134 in midrange circuit is somehow damaged. I will this evening try to change one op-amp at time and see what happens.
Sorry about off-topic again but i cannot resist to say that.
There really was damaged or faulty op-amp in left channel midrange circuit!
Now dc is about 10mV in both midrange channels.
You can guess what this means in sound
😀
There really was damaged or faulty op-amp in left channel midrange circuit!
Now dc is about 10mV in both midrange channels.
You can guess what this means in sound
😀
no idea whether this has been posted in this thread before (sorry!) but Russ White is, after having successfully designed a 2-ch pre, working on a 7.1 analog chip-based preamp (2x texas instrument pga4311).
thread can be found here: http://www.diyaudio.com/forums/showthread.php?postid=753526#post753526
thread can be found here: http://www.diyaudio.com/forums/showthread.php?postid=753526#post753526
DAC+Preamp...
Hello All,
Have been following these topics with high interest for some time:
UCD400 + Power Supplies
Bootstrapped Super-Regulator
...and am curious whether anyone's used a "Super-regulator" to supply both a DAC and a buffer stage to drive a Hypex amp???
I've implemented a 5V version of the Didden/Jung regulator with very good results, and would be interested in doing a ±15V version to supply a good DAC and preamp stage.
...thought about doing an X-BOSOZ preamp, but that would be massive overkill (in terms of output) for the Hypex.
Would be thankful for any responses!
CHeers,
Mike
Hello All,
Have been following these topics with high interest for some time:
UCD400 + Power Supplies
Bootstrapped Super-Regulator
...and am curious whether anyone's used a "Super-regulator" to supply both a DAC and a buffer stage to drive a Hypex amp???
I've implemented a 5V version of the Didden/Jung regulator with very good results, and would be interested in doing a ±15V version to supply a good DAC and preamp stage.
...thought about doing an X-BOSOZ preamp, but that would be massive overkill (in terms of output) for the Hypex.
Would be thankful for any responses!
CHeers,
Mike
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