Page 1 of 2 1 2 LastLast
Results 1 to 10 of 18

Thread: What hardware needed for recording a lecture directly from the power amplifier?

  1. #1
    Join Date
    May 2016
    Location
    India
    Posts
    7
    Thanks
    2
    Thanked 0 Times in 0 Posts
    Rep Power
    0

    What hardware needed for recording a lecture directly from the power amplifier?

    Sign in to disable this ad
    Hi All, till now, being a moron, I have been recording lectures by crudely taping the earphone mic (the one that comes with mobile phones) near the microphone of the speaker and recording the audio through my phone by keeping it in front of the speaker.

    I know that you can somehow record directly from the power amplifier... but, dunno what gear you need. There are line-outs for the amplifiers. What hardware device do I need to record from that line-out? I am sure that my mobile can't do that - tried it... recorded loud (very loud) noise (even though the speaker was speaking in a low voice, my mobile got it as though he was screaming at the top of his lungs)

    By the way, it is line-out that you record from right? or is there some other thing in the amplifier for recording? Thanks a lot.

  2. #2
    Join Date
    Oct 2005
    Location
    Ranelagh Tasmania
    Age
    68
    Posts
    7,872
    Thanks
    214
    Thanked 624 Times in 507 Posts
    Rep Power
    21474858
    The line out is what you would normally use for recording.

    But you will have difficulty if you want to connect directly from a line output to a microphone input, because the line-out is likely to overpower the input (as you've discovered).

    What you need to make use of the line out is a device that has a line level input.

    Consider getting something like the Zoom H1 handheld recorder. It has a line in, but you can also record using its own mikes.

  3. #3
    Join Date
    May 2016
    Location
    India
    Posts
    7
    Thanks
    2
    Thanked 0 Times in 0 Posts
    Rep Power
    0
    So, with the Zoom H1, I will be able to underpower the recording from the amplifier? So, I just connect line out to the H1 and can underpower it and record the whole thing? Thanks, gecky zzed.

  4. #4
    Join Date
    Feb 2009
    Location
    northampton uk home of Dr Who and Blackstar Amps!
    Posts
    10,010
    Thanks
    1
    Thanked 671 Times in 635 Posts
    Rep Power
    9374895
    Can of many worms this.

    Firstly, have we actually established the "power amplifier" HAS a line out? If so it will probably be a "pro" operating level of +4dBu, about a volt rms. I will check the line inputs on a Zoom Hx but I would guess they would be fine. Such a level might however be a bit hot for a PC input or a phone.

    If there is no line out it is possible to buy a cheap "DI" box that can reduce even very high power amplifier speaker levels to line level. Behringer make one such. N very B! You must get a DI RATED for amplifier input! The standard fare can only cope with guitar levels and a bit more. (note too that such DIs MUST be used with a load. Not applicable in this case, jus' sayin')

    But, some PA amplifiers use the "100 volt line" speaker distribution system and even the high level DI would probably overload on that setup. Find out. (point: For reasons I have never been able to discover, our US friends use a "70.7 volt" system? That would be almost as bad as the more mathematically easier 100V)

    In any event be very careful tapping into speaker lines, you could damage the PA (and 100V will bite!)

    Cannot find a line input sensitivity specc' but since line out is specc'ed at -10dBV (316mV) I suspect the H1 is geared for neg ten inputs? Overload from a +4dBu source is therefore a possibility.

    Dave.

  5. #5
    Join Date
    Oct 2005
    Location
    Ranelagh Tasmania
    Age
    68
    Posts
    7,872
    Thanks
    214
    Thanked 624 Times in 507 Posts
    Rep Power
    21474858

  6. #6
    Join Date
    Dec 2002
    Location
    Massachusetts
    Age
    71
    Posts
    4,531
    Thanks
    11
    Thanked 230 Times in 211 Posts
    Rep Power
    10181459
    Maybe rix55 could state the manufacturer and model number for the power amplifier? Or at least a picture of the back of the unit (assuming that's where the "Line output" resides).
    Mark.......

  7. #7
    Join Date
    May 2016
    Location
    India
    Posts
    7
    Thanks
    2
    Thanked 0 Times in 0 Posts
    Rep Power
    0
    Quote Originally Posted by arcaxis View Post
    Maybe rix55 could state the manufacturer and model number for the power amplifier? Or at least a picture of the back of the unit (assuming that's where the "Line output" resides).
    Hi arcaxis & gecko, I have attached the PA manual's back picture illustration (could not find a real pic on the net). Also, a front pic and its specs included.
    I didn't understand what ecc83 was speaking about damaging the PA? Can a device like H1 damage the PA?

    On another note, even though I have subscribed to this thread, I am not getting any update emails when you guys post. Have to write to HomeRecording.com about this.
    Attachment 97011Attachment 97010Attachment 97009

  8. #8
    Join Date
    Oct 2005
    Location
    Ranelagh Tasmania
    Age
    68
    Posts
    7,872
    Thanks
    214
    Thanked 624 Times in 507 Posts
    Rep Power
    21474858
    The PA has a line output. The manual doesn't specify whether it is a TS or TRS socket. MY guess is that it is a mono TS output.

    This is the output that you would use to feed a recording input. However, I will restate the point I made in my first response: if you are trying to record a line-level signal with an input intended for mike level, you will have difficulty avoiding distortion because of too strong a signal coming in.

    The Zoom H1's has a mike/line-in socket, so it can accept either mike or line level. Presumably this is controlled through the input level buttons, which may have to be set very low for line-level.

  9. #9
    Join Date
    May 2016
    Location
    India
    Posts
    7
    Thanks
    2
    Thanked 0 Times in 0 Posts
    Rep Power
    0
    Super. Thanks gecko. Proceeding to order a H1. Read and saw the reviews too - seems simple enuf for a noob to operate. Thanks.
    Wonderful forum.

  10. #10
    Join Date
    Dec 2002
    Location
    Massachusetts
    Age
    71
    Posts
    4,531
    Thanks
    11
    Thanked 230 Times in 211 Posts
    Rep Power
    10181459
    Quote Originally Posted by rix55 View Post
    On another note, even though I have subscribed to this thread, I am not getting any update emails when you guys post. Have to write to HomeRecording.com about this.
    Attachment 97011Attachment 97010Attachment 97009
    These attachments aren't showing up for me...."Invalid Attachment specified" ???
    Mark.......

Thread Information

Users Browsing this Thread

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

Similar Threads

  1. Lecture Recording on Tablet
    By jewell118 in forum Recording with tablets & smartphones (iOS & Android)
    Replies: 1
    Last Post: 03-10-2016, 08:47
  2. Recording drums: hardware advice needed
    By takk in forum Cakewalk / Sonar Forum
    Replies: 7
    Last Post: 12-18-2003, 21:36
  3. Can I hook the outputs of a MOTU 896 directly to my monitors' amplifier?
    By Alchemist3k in forum Digital Recording & Computers
    Replies: 2
    Last Post: 09-22-2003, 05:35
  4. Hardware needed for 78rpm recording
    By Havoc in forum Digital Recording & Computers
    Replies: 5
    Last Post: 10-22-2001, 19:42
  5. Replies: 7
    Last Post: 11-20-2000, 19:17

Posting Permissions

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