The Two Channel Advice Thread

Discussion in 'Advice Threads' started by purr1n, Nov 10, 2016.

  1. Azimuth

    Azimuth FKA rtaylor76, Friend

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    Yes, I think Cambridge had bad cap supplier and almost ruined things as they grew. The DAC's were BurrBrown PCM chips from what I recall.

    I had a phono pre, and beat out most stuff in the same price range and comparable to the Mani.
     
  2. nishan99

    nishan99 Friend

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    Can someone please help me find a good tube preamp below $2k? remote control is a must but not the balanced in/out. @schiit still (unfairly) not shipping to my country "because of covid" so the Freya is not an option unfortunately.
     
  3. EagleWings

    EagleWings Friend

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  4. dericchan1

    dericchan1 Rando

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    Hi everyone, seeking your expert advice here.

    I have a power sound audio S15 power subwoofer that I would like to use for both my 2.1 music system and my Anthem receiver (both systems are in the same room and I will never use both at the same time other than leaving the other system in standby mode while the other system is in use)

    Tried using a beresford RCA amp switch box, worked fine except there seemed to have some power interference that sometimes the subwoofer would not go back into standby mode even not in use after the external amp or the receiver gone back to standby. It kept on sending hums to the subwoofer keeping it awake and sometimes even waking the external amp. The subwoofer never had this issue when it was solely used in my Anthem receiver.

    Inquired the owner of power sound audio, his response was “1) you can use both inputs on the subwoofer as a left and a right. They function identically.
    OR
    2) you can connect two systems to the sub. One system per input.”

    I am kinda hesitant to try that even though the owner who makes the sub is obviously extremely knowledgeable.

    Does anyone here have any experiences you can share or perhaps suggest an alternative to try?

    Thanks

    Deric
     
  5. sphinxvc

    sphinxvc Gear Master (retired)

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    @dericchan1 - we use advice threads like these to keep the forum uncluttered. Hope you don't mind me pasting your question below:

     
  6. dericchan1

    dericchan1 Rando

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    Not a problem at all. I am new and didn’t know where my post should go.

    thanks

    Deric
     
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  7. sphinxvc

    sphinxvc Gear Master (retired)

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    No worries. I would go with option 2 above, btw.
     
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  8. dericchan1

    dericchan1 Rando

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    Just an update on my quest to achieve sharing two systems with a single sub. I think I have achieve semi-success. Bought an amazon 50ft sub cable to test. Had it plugged in to the R channel input of the sub with my 2.1 system and plugged the other cable from receiver to L/LFE of the sub. No more power interference or hum. So it’s prob the circuitry of the rca switch box causing the interference!!!

    However, not sure why subwoofer won’t wake up no matter how loud I turn up the volume on my 2.1 system connected to the R port of the sub. But when I turn switch the sub from “auto” to “on”, bass came out perfectly!!

    Sub works perfectly and wake up and goes back to standby automatically for the receiver connected to the L/LFE port of the subwoofer tho. Honestly not sure why that’s the case tho. Is it possible the sub is designed that only sound input to sub through L/LFE can trigger/wake the sub? I tried swapping the two sub cables as well so prob has nothing to do with the amazon cable.

    Deric
     
  9. bixby

    bixby Friend

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    This seems to be a common complaint with a lot of subs. I mean a lot. I have a simple solution. I leave the sub in the ON setting and plug it into an outlet that is controlled by a light switch. Flick of the switch and it is on, flick again and it is off for the night.
     
  10. dericchan1

    dericchan1 Rando

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    My sub is located in a pretty convenient position so it’s not that bad to manually turn on or off. None the less I have it plugged in to a smart switch so I can voice command the sub on and off.

    but just curious as to why the auto trigger only works on the LFE input not the R input

    Deric
     
  11. nishan99

    nishan99 Friend

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    I Had bad experience with Roy Mottram from tubes4hifi which costed me 20 days and $100 for nothing. All I can say he was very unprofessional.
     
  12. iFi audio

    iFi audio MOT iFi Audio

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    It seems that only one input of your sub is auto-sensing. But can you drop in here what sub it is? MAybe there's some info in its manual.
     
  13. dericchan1

    dericchan1 Rando

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    I believe that's probably the case that only the LFE channel has auto sensing. No issue so far, everytime listening to music I will just turn on the Sub from auto standby to ON. It is a power sound audio 15S subwoofer. Don't think it was mentioned in the manual tho

    Thanks

    Deric
     
  14. dericchan1

    dericchan1 Rando

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    Call me crazy!!! I never knew there is such a thing as directional interconnect RCA cables until my experience last night!!!

    I ordered some terminated Van Damme HiFi OFC RCA interconnect from an authorized Uk seller on eBay. They arrived with no “arrows” pointing direction what so ever.

    Connected from my preamp/dac to my amp and played my familiar playlist. Down right it just didn’t sound right, it was harsh and muddled and I could hardly recognize the vocal of my favourite singers, and I had to turn the volume up quite a bit compared to my normal volume. At first I thought perhaps the interconnect needs to be burnt in, so I keep playing the list, but I couldn’t stand listening to the music after a few songs.

    I was really sceptical about what could be wrong so I started examining the cable to make sure connection was nice and tight and I didn’t have the polarity wrong. That’s when I notice the cable jacket has a line that reads “High definition, OFC, “directional” cable. Obviously I wouldn’t know what the hell directional means so I reached out to the seller and he indicated to me that I should follow the direction of the word on the cable and go from source to destination. (I honestly believe he should put an arrow sticky on the cable btw) I followed the direction and reconnected again and now the sound is back to normal again, beautiful clean mids and highs, volume is also back to normal level. It’s quite an upgrade indeed compared to my old van damme pro interconnect cables!!!!

    Obviously I don’t understand how a rca cable can indeed be directional, perhaps someone here can educate me on this?

    Deric
     
  15. sfoclt

    sfoclt Friend

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    The most common reason would be because the shield is lifted at one end. See diagram below. Not sure if your particular cable is wired this way.

    [​IMG]
     
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  16. dericchan1

    dericchan1 Rando

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