In-car comparison of XM & Sirius

Discussion in 'SiriusXM Soundwave Cafe' started by HomieG, Dec 21, 2008.

  1. HomieG

    HomieG Member

    I finally got around to installing a docking cradle for my Sirius Brix Streamer Replay in my new truck. The truck also has XM which is currently on a 3-month trial. I plan on letting the trial lapse when its up, and using the Sirius radio which has a lifetime sub on it.

    To me the audio quality sounded the same on those channels which were duplicated on Sirius and XM. Interestingly, I found the Sirius audio lagged the XM audio by about 4-5 seconds.
  2. semipenguin

    semipenguin Bum Looker

    I noticed the lag years ago when I'd listen to ESPN Radio...:right:
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  3. TSS Taylor

    TSS Taylor DRC Fan

    It's funny that if I listen to Howard 101 for example on my XMP3 with the Best of SIRIUS it's in ahead of the stream that's played on SIRIUS.
  4. IdRatherBeSkiing

    IdRatherBeSkiing This space for rent

    The lag is dependant on the channel. Try a NY based channel like the 70s and the lag would probably the other way.
  5. snakester

    snakester Member

    One thing I noticed when I was a dual sub was the dropouts tend to be less jarring. XM has sort of an "error compensation-comfort noise" style system, where the last couple of frames of received audio are echoed out into white noise, and the radio keeps track of where in the stream it was, resuming at the right place.

    Sirius dropouts, on the other hand, the radio seems to just decode whatever's thrown at it, including error bits, making some ungodly, deafening noises at times. There seems to be no form of error compensation, just a jarring, off of the edge of a cliff type noise. There's also no time code in the audio, resulting in time differences in when the audio comes back, sometimes by a second or so, really being inconvenient when you're tring to sing along with the songs! The only real advantage of the sirius platform I can think of is the fact that it was designed for more than 16 letters, but XM overcame that limitation later on.

    XM seems to have the superior sound quality now, being a lot less swishy then sirius, and their processing has overcome most of the problems inherent with SBR.

    Howard 100 is from NY, and it's still a bit delayed on Sirius side.
  6. downsj

    downsj Member

    Around here, XM drops out considerably (at least 2x) more than Sirius. It's extremely annoying.

    I would never buy an XM radio as a result, it's Sirius or nothing for me. XM's sat coverage just isn't as good.
  7. DAB

    DAB Mod Emeritus

    Where is around here? In Louisiana just the opposite is true!
  8. IdRatherBeSkiing

    IdRatherBeSkiing This space for rent

    That makes no sense unless they are feeding the NY feeds to DC then back in bulk to NY for uplink.

    Just checked the 70s and it is also delayed. This does appear to be what they are doing.
  9. downsj

    downsj Member

    Pacific Northwest.
  10. DAB

    DAB Mod Emeritus

    It has always been delayed even before the merger, so I don't think you are correct.
  11. IdRatherBeSkiing

    IdRatherBeSkiing This space for rent

    Before the merger they were not playing identical streams. There was no concept of being 'delayed'. An XM radio is always about 2 seconds ahead of a Sirius radio playing the same channel.
  12. snakester

    snakester Member

    I think he means the Best of Sirius channels on Xm before the merger.
  13. IdRatherBeSkiing

    IdRatherBeSkiing This space for rent

    That I could not tell you as I do not have Best of on any of my radios.
  14. DAB

    DAB Mod Emeritus

    Exactly! But I can take it a step further. I can take two tuners on different antennas and one will be a tad bit more delayed than the other.
  15. IdRatherBeSkiing

    IdRatherBeSkiing This space for rent

    So you think it is pure chance that my SL2 is ALWAYS 2 seconds behind my Tao?

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