Onkyo DX 6850=DX 706 upgrade - Page 2 - diyAudio
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Old 5th February 2012, 06:19 PM   #11
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The op amp now is OPA 2134 but I canít see a difference between 5532 an 2134
I will try LM4562, I use it on my DAC with CS4398 the output was with 5532 but now I have 4562. I like this OP amp.
In the CD player I changed the filter capacitors with Nichicon Fine Gold.
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Old 5th February 2012, 07:48 PM   #12
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I wasn't impressed by 2134 either. Not bad, just not sensible better...
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Old 5th February 2012, 10:05 PM   #13
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The OPA134-series is a WAY better chip than you guys think. The problem is that you don't give it adequate power supply support. The 2134 can deliver serious peak currents to the load, and benefits enormously by very copious, instantly available stored supply energy. The LM4562 sounds a bit etched compared to a properly supplied 2134. If you don't hear a difference from 5532 to 2134, either your remaining system is inadequate or you are strangling the dynamics & richness of the 2134 by typical, woefully inadequate supply support.
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Old 5th February 2012, 11:06 PM   #14
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I did test it following a TDA1541. Maybe that was the problem... however, to my ears, the LM4562 performed better in the same place (I/V).
And from this paper results are pointing in the same direction.

Last edited by SoNic_real_one; 5th February 2012 at 11:09 PM.
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Old 9th February 2012, 10:21 PM   #15
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Thanks for the invitation, I still have this cd player which is wonderfully constructed I have done numerous tweaks and changes mainly to the dac/audio PCB, for one thing I separated the trafos adding two more, one to the dac and a second to the audio circuit, have change also opamps and several types and brands of output caps. - I gave up, never sounded good, I still use a Magnavox CDP650 on my main system8, highly modified tho.
I have some other DAC's and wish I could do a new board to change completely that board.
So no useful hints or tweaks for this one.

Cheers
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Old 10th February 2012, 08:02 PM   #16
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Hi thanks for your replay.
I use the cd player as transport for a DAC with CS4398 but i always eanted to upgrade this 6850-706 to a 6870-708.
Tomorrow a friend of mine will receive a 6870 and i will know the value for some parts and i will finish mine, i will made some test between them.
I will post here the results of the test.

I like this CD because it is a cheap machine and well build with good components,
Before to start modifying i made a test between 6850 and CEC TL 51xr and also a Yamaha CD S 2000 both are almost 1500 euro.
Conclusion: I like the Onkyo DX 6850 i will never pay 1500 euro for a CD like those two .

Best regards
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Old 21st February 2012, 01:20 AM   #17
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Hi there I have the Onkyo dx-706 (BH) since 2 days from a relative who never use it. It is brand new (from plastic white paper in the box ) and I want to know if I can upgrade this component to have a near hi-end cd player. If yes what are the pieces electronics parts to change and with witch parts number to change them please ?

Sorry for my english I talk french ( quebec city) ... This player is amazing and built as a tank lol

thks all !
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Old 21st February 2012, 01:23 AM   #18
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Hi all ! I have a dx-706 brand new since 2 days ( onkyo integra ) and i want to know witch parts to change to make a hi-end cd player ?

thks for your help and advise

Mario
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Old 21st February 2012, 08:54 AM   #19
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Changing op-amps, capacitors etc is wasting time, not always putting better parts give better sound!!! If you want a really good sound producing by this machine cut out analog outputs completely, take signal straight from DAC's in to new and simple analog section with two Ecc88 without opamps and all that stuff. That is very good result solution. But again HiEnd? I doubt... There are much better CD's for such modification (like cheap Denon's, Kenwood... with PCM1702, Marantz, philips etc with TDA1541, Onkyo with PCM58 and much, MUCH more) - with them, You can get far better sound than from 6850/706.

Regards
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Old 21st February 2012, 11:19 AM   #20
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Thanks Opteron. A friend of mine with this 706 made change as the 2 analogue output and the rotate motor to a brand new motor ( to turn the disk ) . Cause I dont have 1500-2000$ and more so I want to got the most of this onkyo dx-706 . Now just have to find a technician who can bypass the analog plugs ( rca ) and take from the dac signal to a pair of rca high quality output . Thanks for your help .
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