Results 1 to 10 of 10

Thread: Using HT-processor with 2-channel setup...

  1. #1
    Senior Member Jakob's Avatar
    Join Date
    Apr 2003
    Location
    Sweden
    Posts
    311

    Using HT-processor with 2-channel setup...

    My question is regarding using my 2-channel setup in an HT setup.
    I want to use my beloved ARC preamp in stereo mode and was thinking of connecting the processors front speaker pre-out to an input on the ARC. This will mean I need to have the ARC on when watching movies and have the gain-knob at a specific level. That I can live with.
    Is there a risk that a strong signal from the pre-out on the processor can damage the input on the ARC pre-amp?

    Any input appreciated,

    Thanks, Jakob

  2. #2
    Senior Member grumpy's Avatar
    Join Date
    Oct 2003
    Location
    SoCal
    Posts
    5,742
    which ARC preamp? some have a processor pass-through capability...

    (and no, a line-level out to your preamp in, e.g., AUX, should not hurt
    the preamp).

  3. #3
    JBL 4645
    Guest
    Quote Originally Posted by grumpy View Post
    which ARC preamp? some have a processor pass-through capability...

    (and no, a line-level out to your preamp in, e.g., AUX, should not hurt
    the preamp).
    Gumpy, I was wondering about the input voltage that it would allow before any possible clipping/distortion. Don’t most have voltage input of 3volts input??

  4. #4
    Senior Member Jakob's Avatar
    Join Date
    Apr 2003
    Location
    Sweden
    Posts
    311
    It's the ARC LS7, one of their most simple designs. No pass-through capability there.

    The specs for the LS7 say: maximum input 20V. If the processor is capable of delivering 25V, what will happen then?

    Thanks for your answers!

  5. #5
    JBL 4645
    Guest
    Quote Originally Posted by Jakob View Post
    It's the ARC LS7, one of their most simple designs. No pass-through capability there.

    The specs for the LS7 say: maximum input 20V. If the processor is capable of delivering 25V, what will happen then?

    Thanks for your answers!
    I’d keep it down a few db, if I was you. What is the db to voltage value figure how many db makes up for 1volt? Something I haven't looked into myself, if I notice distortion I cut back on the db level on the main AVR.

    I’ve just flipped though the user operating manual for the Yamaha DSR-70pro that acts as surround extra decoder for centre back and overheard matrix surround effects with the main AVR. Its input is rated at 2.0 volts rms and this was deigned for the signal output on say a Hi-Fi stereo vcr or laserdisc player, I’ve had no issues using it in any other way for the past 12 years.

    I just had look on Google image at the preamp so it doesn’t have clipping LED warning indictor, I was thinking of those NAD preamps that often have clipping LED warning indictor to alert the user their overloading it.

  6. #6
    Senior Member grumpy's Avatar
    Join Date
    Oct 2003
    Location
    SoCal
    Posts
    5,742
    If the processor is capable of delivering 25V, what will happen then?
    You would need to turn up the volume on the processor -way- too far to reach that level.
    So don't do that. Most amplifiers will output their maximum levels with <2V input.

    What you should be aiming for (IMO) is to get the same level out of the LS7 as what
    you put in from the processor (volume setting that is "unity gain") ... or if the knob
    were marked and calibrated, 13dB of attenuation using the volume control... since
    the tube circuitry following adds 13dB to whatever comes out of the volume pot.

    To answer your question more directly:
    I don't see the LS7 schematic on arcdb, but I suppose you could exceed the volume control
    (potentiometer) input spec (e.g. the ALPS 100Kohm "blue velvet" max operating AC
    voltage is 30V), and damage it (maybe not totally smoke the unit, but cause it to
    function noisily or erratically).

  7. #7
    Senior Member Jakob's Avatar
    Join Date
    Apr 2003
    Location
    Sweden
    Posts
    311
    Ok, that means that under normal circumstances I should be fine.


    Thank you very much for this info.

    Regards!

  8. #8
    Senior Member brutal's Avatar
    Join Date
    Mar 2007
    Location
    Parker, CO
    Posts
    1,051
    Quote Originally Posted by Jakob View Post
    Ok, that means that under normal circumstances I should be fine.


    Thank you very much for this info.

    Regards!
    FWIW, I ran my HT pre-amp mains output through a Yamaha C-70 pre-amp that I used to do bridging to a pair of M-80 amps. I just level matched the T-70 volume control with the volume output of the other HT channels using a combination of the HT built in room correction and a meter.

    My setup was static, but if you knew the static position of the preamp volume control when you wanted to run HT, and reset it after running purely 2-channel, you'd have the best of both worlds. This is assuming you mean to run vinyl, high end CD, etc direct into the pre and limit TV, SAt, DVD, et.al. to the HT front end. Otherwise I see no improvement if you're simply inserting a pre betwixt the HT processor and external amps.


  9. #9
    JBL 4645
    Guest
    Quote Originally Posted by brutal View Post
    FWIW, I ran my HT pre-amp mains output through a Yamaha C-70 pre-amp that I used to do bridging to a pair of M-80 amps. I just level matched the T-70 volume control with the volume output of the other HT channels using a combination of the HT built in room correction and a meter.

    My setup was static, but if you knew the static position of the preamp volume control when you wanted to run HT, and reset it after running purely 2-channel, you'd have the best of both worlds. This is assuming you mean to run vinyl, high end CD, etc direct into the pre and limit TV, SAt, DVD, et.al. to the HT front end. Otherwise I see no improvement if you're simply inserting a pre betwixt the HT processor and external amps.
    I thought that sound familiar the big fat large Yamaha with the large red LED barograph displays. I haven’t seen a picture of those in years, and had look on Google image, nice sweet. Mid 80's amp and there still going strongly.

  10. #10
    Senior Member brutal's Avatar
    Join Date
    Mar 2007
    Location
    Parker, CO
    Posts
    1,051
    Quote Originally Posted by JBL 4645 View Post
    I thought that sound familiar the big fat large Yamaha with the large red LED barograph displays. I haven’t seen a picture of those in years, and had look on Google image, nice sweet. Mid 80's amp and there still going strongly.
    Many of them are expiring if they haven't been attended to. Yamaha, like many others of that era, are experiencing issues from the Sony Bond glue that was used all too generously to hold medium sized caps to the boards for assembly. Over time, the glue gets brittle and becomes corrosive and possibly a but conductive.

    I've repaired about 20 Yamaha amps of this issue, only one truly stopped working properly before I attended to them, but real techs I know have many fixed dozens and the corrosive damage is quite evident.


Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Similar Threads

  1. New Audio Processor
    By Carl_Huff in forum Forum Announcements
    Replies: 1
    Last Post: 08-28-2009, 10:00 PM
  2. Dolby Lake Processor
    By JBL 4645 in forum Equalizers
    Replies: 30
    Last Post: 03-11-2009, 07:35 PM
  3. Anybody uses outlaw processor?
    By northwood in forum Miscellaneous Gear
    Replies: 9
    Last Post: 12-17-2008, 11:44 PM
  4. 4024A digital signal processor, upgrades available?
    By KRZ in forum Lansing Product Technical Help
    Replies: 1
    Last Post: 04-26-2008, 04:05 PM
  5. video processor to 1 source make 1 pic on multiple TV's
    By shillyar in forum Miscellaneous Gear
    Replies: 3
    Last Post: 03-09-2006, 10:53 PM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •