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Thread: Denon 2900

  1. #1

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    Default Denon 2900

    Well I have dove in. Very simple. Even for me:)
    Please. Please contact me a ben62670 @ yahoo.com. Make sure to include who you are, and you are from Polk so I don't delete your email. Also I am now physically unable to work on any projects. If you need help let these guys know. There are many people who will help if you let them know where you are.
    Thanks
    Ben

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    Quote Originally Posted by ben62670 View Post
    Well I have dove in. Very simple. Even for me:)
    What'd you do Ben? I read something about parts/etc you got to mod your player with or something. Interested in your findings, I've got a Denon DVD2800 that I love as a CDP.

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    Quote Originally Posted by heiney9 View Post
    Any clue how to use the internet? Found it in about 10 sec.

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    You bought 1?

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    Quote Originally Posted by ben62670 View Post
    Well I have dove in. Very simple. Even for me:)

    Did You Upgrade it?

    Because I have an extra 3910 if you wanna try that one.
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    Quote Originally Posted by kawizx9r View Post
    What'd you do Ben? I read something about parts/etc you got to mod your player with or something. Interested in your findings, I've got a Denon DVD2800 that I love as a CDP.

    -Freddy
    Well I got bored and couldn't sleep so I started digging around in my 2900. Two very easy to remove OpAmps and a slew of crappy electrolytic caps in the signal path. I removed the two OpAmps and installed sockets for an easy swap to better units. I have a bunch of OPA2124's here so no biggy. I like the 2134's dynamics very much, and the mids are a little forward for most peoples tastes, but I like the snap of a rim shot on a drum, and the bite of a live sax. It's kinda funny because I bought this unit intending on modding, and I haven't cracked it for almost a year. For me this is not normal. Well The iron is still going. Just down in the basement scrounging for parts.
    Take care.
    Ben
    Please. Please contact me a ben62670 @ yahoo.com. Make sure to include who you are, and you are from Polk so I don't delete your email. Also I am now physically unable to work on any projects. If you need help let these guys know. There are many people who will help if you let them know where you are.
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    Quote Originally Posted by Lasareath View Post
    Did You Upgrade it?

    Because I have an extra 3910 if you wanna try that one.
    Lets see if I smoke this one first;)
    BTW I wanted to call earlier, but lost your number.
    Shoot it to me again please.
    Thanks lover.
    Ben
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    Don't light your smoke with a soldering iron;)
    At near $50 a carton roll your own is the way to fly:)
    PS later I am going to upgrade the caps to better 10ufs. For now I am using 4.7 on the top indaytons, and 4,7uf on the bottom parallel in another flavor.
    Last edited by ben62670; 10-20-2009 at 07:22 AM.
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    Ben

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    LOL, I was about to ask you if that was something else Ben. Roll your own "cigs" huh? :D

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    I have been trying to refrain from posting, but I am so glad I finally did this. SACD has always sucked on this player. CD has not been very good either. I used to run an Adcom GDA-700 DAC, and then a custom DAC courtosy of GV27, and now the modded 2900. What is special about the 2900? IDK really, but it is very simjple. I had the OPA2134's kicking around and some caps. The original OpAmps were 825's? Before with no matter what setup(except vinynal via my custom phono pre) the soundsatge was too forward. Now I have some depth like tubes(dare I say), and width. The mids have allways plagued my system. Right now it is a hair black(dare I say anything bad), but the dynamics are there, and the highs are there. Symbol hits are good tube like with sustain, and Alsison Kruas has her breath in full effect between notes. I was in the next room getting some juice, and the bass always hit hard, but now I had the weight that I have been missing. I felt the vertical lifting sensation that before was just a hard hit to the chest. The mods are so stupidly simply that most who can read a simple diagram can do it:) I can't wait to get some real caps in there
    Enjoy.
    Ben

    Edit: BTW I am not claiming to have an ultra high end system at all, but this certainly is a reiteration that mods on mediocre equipment can produce surprising results.
    Last edited by ben62670; 10-20-2009 at 09:42 AM.
    Please. Please contact me a ben62670 @ yahoo.com. Make sure to include who you are, and you are from Polk so I don't delete your email. Also I am now physically unable to work on any projects. If you need help let these guys know. There are many people who will help if you let them know where you are.
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    Ben

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    Quote Originally Posted by ben62670 View Post
    [IMG]...Don't light your smoke with a soldering iron...
    It is not a good idea to use a soldering iron to reheat your coffee either. Yes, I knew an old-timer who used to do this.

    Thank you for the mod details. You have peaked my interest and my 2910 may he finding its way to my work bench...as soon as I clear out the other junk that is on my tinker pile.
    Stan

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    LMK when you are ready. I'll look into it with ya. It shouldn't be very hard to do if you can solder small IC's.
    Please. Please contact me a ben62670 @ yahoo.com. Make sure to include who you are, and you are from Polk so I don't delete your email. Also I am now physically unable to work on any projects. If you need help let these guys know. There are many people who will help if you let them know where you are.
    Thanks
    Ben

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    Default Mods

    I know you have been talking tubes. Why dont you make a tube output stage ala Lampizator! Get rid of those op amps completely.
    http://www.lampizator.eu/LAMPIZATOR/...%20player.html
    Have fun.

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    BB I have a tube buffer on the way. I did this because 'I was bored. I was just overly surprised how bad the analog output stage was. I'll get a tube buffer in a week or so;)
    Please. Please contact me a ben62670 @ yahoo.com. Make sure to include who you are, and you are from Polk so I don't delete your email. Also I am now physically unable to work on any projects. If you need help let these guys know. There are many people who will help if you let them know where you are.
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    Ben

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    Damn. Out of the blue comes some serious imaging that wakes me up!
    SMB is playing now.
    Love Space Cowboy!
    I told you 'bout living in the U.S. of A.
    Don't you know that I'm a gangster of love
    Let me tell you people that I found a new way
    And I'm tired of all this talk about love
    And the same old story with a new set of words
    About the good and the bad and the poor
    And the times keep on changin'
    So I'm keepin' on top
    Of every fat cat who walks through my door

    I'm a space cowboy
    Bet you weren't ready for that
    I'm a space cowboy
    I'm sure you know where it's at
    Yeah, yeah, yeah, yeah

    I was born on this rock
    And I've been travelin' through space
    Since the moment I first realized
    What all you fast talkin' cats would do if you could
    You know, I'm ready for the final surprise
    There ain't no way around it
    Ain't nothing to say
    That's gonna satisfy my soul deep inside
    All the prayers and surveyors
    Keep the whole place uptight
    While it keeps on gettin' darker outside

    I'm a space cowboy
    Bet you weren't ready for that
    I'm a space cowboy
    I'm sure you know where it's at
    Yeah, yeah, yeah, yeah

    I see the show downs, slow downs, lost and found, turn arounds
    The boys in the military shirts
    I keep my eyes on the prize, on the long fallen skies
    And I don't let my friends get hurt
    All you back room schemers, small trip dreamers
    Better find something new to say
    Cause you're the same old story
    It's the same old crime
    And you got some heavy dues to pay

    I'm a space cowboy
    Bet you weren't ready for that
    I'm a space cowboy
    I'm sure you know where it's at
    Yeah, yeah, yeah, yeah
    Last edited by ben62670; 10-20-2009 at 03:10 PM.
    Please. Please contact me a ben62670 @ yahoo.com. Make sure to include who you are, and you are from Polk so I don't delete your email. Also I am now physically unable to work on any projects. If you need help let these guys know. There are many people who will help if you let them know where you are.
    Thanks
    Ben

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    My wife was asking me the other day about the symptoms of lead poisoning.
    Stan

    Main 2ch:
    Polk LSi15 (DB840 upgrade)
    Parasound: C/PT-600, HCA-800II; Denon: DVD-2910, DRM-800A; Monster HTS3600-MKII, Grado SR-225i

    HT:
    Denon AVR-888, Polk: RM7, PSW10, Marantz UD5005, Panasonic TC-P42S60

    Other stuff:
    Denon: DRA-835R, DRA-825R, DCD-660, DRM-700A, DRR-780; Polk: RTA11TL (RDO198-1, XO and Damping Upgrades), S8, Monitor 5A, TSi100; Pioneer CT-6R, PL-530; Onkyo CP-1046F; Ortofon OM5E, Marantz PM5004, CD5004

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    I have the shop manual for the 2900 but not the 2910. How similar do you suppose the 2900 and the 2910 are?
    Stan

    Main 2ch:
    Polk LSi15 (DB840 upgrade)
    Parasound: C/PT-600, HCA-800II; Denon: DVD-2910, DRM-800A; Monster HTS3600-MKII, Grado SR-225i

    HT:
    Denon AVR-888, Polk: RM7, PSW10, Marantz UD5005, Panasonic TC-P42S60

    Other stuff:
    Denon: DRA-835R, DRA-825R, DCD-660, DRM-700A, DRR-780; Polk: RTA11TL (RDO198-1, XO and Damping Upgrades), S8, Monitor 5A, TSi100; Pioneer CT-6R, PL-530; Onkyo CP-1046F; Ortofon OM5E, Marantz PM5004, CD5004

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    Quote Originally Posted by skrol View Post
    My wife was asking me the other day about the symptoms of lead poisoning.
    Well after bridge painting I would say inhaling crack is close to inhaling lead, but most bridge painters smoke crack. YMMV
    Ben
    Please. Please contact me a ben62670 @ yahoo.com. Make sure to include who you are, and you are from Polk so I don't delete your email. Also I am now physically unable to work on any projects. If you need help let these guys know. There are many people who will help if you let them know where you are.
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    Ben

  18. #18
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    Give the offset levels a check with your DMM but I suspect it has a differential DAC chip(PCM1791/92?) and with the low offset of the 2134 should allow you to remove the output coupling caps altogether.You may also want to bypass those muting transistors at the output.(Atleast that what they appear to be for in the pic.)
    Last edited by GV#27; 10-20-2009 at 05:35 PM.

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    The 4 output caps are not in series, but are part of the "feedback" loop. I did test this for sure. An upgrade there may be in order. I have not yet pulled one to check the value.
    Ben
    Please. Please contact me a ben62670 @ yahoo.com. Make sure to include who you are, and you are from Polk so I don't delete your email. Also I am now physically unable to work on any projects. If you need help let these guys know. There are many people who will help if you let them know where you are.
    Thanks
    Ben

  20. #20
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    Quote Originally Posted by ben62670 View Post
    The 4 output caps are not in series, but are part of the "feedback" loop.
    I can't see the values on the big film's you installed but they look too big for use in the feedback network unless they are part of a servo circuit to null offset.Do you have schem for it?
    Last edited by GV#27; 10-20-2009 at 05:44 PM.

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    The ones
    I replaced are 2 4.7ufs in parallel to come close to the recommended 10uf caps. I personally think this is way too large, but DIY audio says they are correct? Also the little blues are feed backs for sure. No diagram:(
    Please. Please contact me a ben62670 @ yahoo.com. Make sure to include who you are, and you are from Polk so I don't delete your email. Also I am now physically unable to work on any projects. If you need help let these guys know. There are many people who will help if you let them know where you are.
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    Ben

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    i got one packed up ready to send ya lol.
    Living Room Rig:D
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    Quote Originally Posted by TouchOfEvil View Post
    i got one packed up ready to send ya lol.
    Let me play with mine a little first. There are more inexpensive mods that can be done. The OpAmps are going to get some caps added, and the muting resistors are going to be removed when I figure out which ones they are. Also I may look into different opamps. I do want to change out the caps for better pieces on the outputs. I don't understand why the recommended values are so high. There is no doubt that the few mods done so far are significant, but I really want to do the whole package right first shot.
    Ben
    Please. Please contact me a ben62670 @ yahoo.com. Make sure to include who you are, and you are from Polk so I don't delete your email. Also I am now physically unable to work on any projects. If you need help let these guys know. There are many people who will help if you let them know where you are.
    Thanks
    Ben

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    Quote Originally Posted by ben62670 View Post
    Let me play with mine a little first. There are more inexpensive mods that can be done. The OpAmps are going to get some caps added, and the muting resistors are going to be removed when I figure out which ones they are. Also I may look into different opamps. I do want to change out the caps for better pieces on the outputs. I don't understand why the recommended values are so high. There is no doubt that the few mods done so far are significant, but I really want to do the whole package right first shot.
    Ben
    Ya man i'm not in any rush. I have the rotel unit kicking it for me right now but the second system could use a upgraded denon in the future.
    Living Room Rig:D
    Rotel RSP-1069/Rotel RMB-1095/Rotel-1072/Polk lsI15's W/modded xoverW/DBsubs/Polk LsiC/lsI7's/Klipsch sub-12"the weak link"/DLP Mitsubishi 65"
    Xbox360/PS3/WII
    M.Br. setup:)
    Emotiva MMC-1/Rotel RMB-1075/Polk BlackStone TL350's/Velodyne SPL1000/Samsung 51" Plasma
    Computer Rig:
    Rotel RB1050/Tannoy DC4's/Klipsch RW-10d/ImodIpod/HK AVR230 for now....
    Headphones-Ultrasone-HFI780's w/LittleDot MK Vamp Portables Panasonic HJE-900's

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    Quote Originally Posted by GV#27 View Post
    Give the offset levels a check with your DMM but I suspect it has a differential DAC chip(PCM1791/92?) and with the low offset of the 2134 should allow you to remove the output coupling caps altogether.You may also want to bypass those muting transistors at the output.(Atleast that what they appear to be for in the pic.)
    It is a full differential DAC. I am not sure what model, but it sounds good. Well I have played around some tonight, and decided to bypass everything after the last OpAmp straight to the Jack with just a 100r in the signal path to reduce an chance of oscillation. Bass is a little harder hitting, the mids are a little more forward, but not in your face like before the mods started. It is nice to have this player. Thanks much GD:) The way this is setup is nice with 2 pairs of front outs. One set is with the caps... all in the ciruit, and the other is strtaight from the output pins. This is very cool for doing an easy comparioson. Time for some better OpAmps. Also I did mod the power caps on the board near as possible to better the power the OPA's get. Maybe I will bias the OpAmps into class A next. Also the PS is SMPS which I have never been a fan of. Maybe I will build a toroidal PS for just the analog section.
    Ben
    Last edited by ben62670; 10-22-2009 at 01:04 AM.
    Please. Please contact me a ben62670 @ yahoo.com. Make sure to include who you are, and you are from Polk so I don't delete your email. Also I am now physically unable to work on any projects. If you need help let these guys know. There are many people who will help if you let them know where you are.
    Thanks
    Ben

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    Time for some boutique caps. ;)

    Let's see some more pics.
    "He who fights with monsters should look to it that he himself does not become a monster. And when you gaze long into an abyss the abyss also gazes into you." Friedrich Nietzsche

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    Quote Originally Posted by Face View Post
    Time for some boutique caps. ;)

    Let's see some more pics.
    You know what. The capless output is great on some material, but on other material the cheap caps sweetened it a bit. I am thinking some 4.7uf AuriCaps may be in order. It is very easy to switch between outputs and have the best of both worlds. The soundstage is freaky(in a very good way). I need a little more gain with my passive pre, and I think I am going to add a tube stage in here. It is already on order:)
    Please. Please contact me a ben62670 @ yahoo.com. Make sure to include who you are, and you are from Polk so I don't delete your email. Also I am now physically unable to work on any projects. If you need help let these guys know. There are many people who will help if you let them know where you are.
    Thanks
    Ben

  28. #28

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    The best cap is no cap.

    Is your pre direct coupled?
    "He who fights with monsters should look to it that he himself does not become a monster. And when you gaze long into an abyss the abyss also gazes into you." Friedrich Nietzsche

  29. #29

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    My Pre is an alps 100k pot and the signal is sent to the custom active XO. The XO has DC protection if I remember correctly, but I measured near nill DC offset from the Denon outputs. The cheap caps I am using seem to have a little better sustain, and imaging. It takes away from the digital edge. This is by far the closest to tubes yet. The caps are still doing the roller coaster of burnin, but I am going to bite the bullet and get some decent caps.
    Ben
    Please. Please contact me a ben62670 @ yahoo.com. Make sure to include who you are, and you are from Polk so I don't delete your email. Also I am now physically unable to work on any projects. If you need help let these guys know. There are many people who will help if you let them know where you are.
    Thanks
    Ben

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    I've heard Auricaps in electronics and they were ok. Smooth, a little laid back and soft.
    "He who fights with monsters should look to it that he himself does not become a monster. And when you gaze long into an abyss the abyss also gazes into you." Friedrich Nietzsche

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