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Thread: How best to connect my sub to amp?

  1. #11
    Join Date: Feb 2013

    Location: W Lothian

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    I'm Grant.

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    Quote Originally Posted by Stryder5 View Post
    Point 1. Sub 1 or 2 will work, so the answers yes.

    Point 2. Some amplifiers have pre outs to feed a seperate power amp. The internal power amp is still connected. That is what's suggested in the second diagram. On the NAD there is a jumper that feeds the pre amp to the internal power amp but by using this you disconnect the power amp therefore the main speakers.

    Hope that makes sense.

    Gary
    Yup. That's my take too
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  2. #12
    Join Date: Aug 2009

    Location: Staffordshire, England

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    I'm Martin.

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    I agree with Gary, you can use just one lead to either the left or right on the sub. I've done that in the past and that works fine. Leads tend to come in pairs though.

    You can't use the pre out.
    Current Lash Up:

    TEAC VRDS 701T > Sony TAE1000ESD > Krell KSA50S > JM Labs Focal Electra 926.

  3. #13
    Join Date: Mar 2013

    Location: nottingham

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    I'm nigel.

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    Remember......you should not be able to hear the sub....at all.
    To little output is MUCH better than too much.

    If its up too high, it will impress at first, but trust me, after a while you will notice the bass dragging the impact and speed of replay back.

    Get a friend to sit in your hotseat and listen while you twiddle (ooh err missus etc), your back will thank you.

  4. #14
    Join Date: May 2016

    Location: Much Wenlock

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    I'm Gary.

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    Quote Originally Posted by Macca View Post
    I agree with Gary, you can use just one lead to either the left or right on the sub. I've done that in the past and that works fine. Leads tend to come in pairs though.

    You can't use the pre out.
    Sub leads come as singles ( no difference in construction to normal RCA's though) and are generally longer than normal RCA's to let you place the sub where you want. To a degree you can place the sub anywhere to suit your setup.

  5. #15
    Join Date: Jun 2018

    Location: Stafford UK

    Posts: 24
    I'm Andy.

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    Quote Originally Posted by sumday View Post
    Remember......you should not be able to hear the sub....at all.
    To little output is MUCH better than too much.

    If its up too high, it will impress at first, but trust me, after a while you will notice the bass dragging the impact and speed of replay back.

    Get a friend to sit in your hotseat and listen while you twiddle (ooh err missus etc), your back will thank you.
    Yeah I don't need/want the sub up high. It'll hopefully just be a little extra meat to compliment the brightness of the 902i's. Thanks for the advice.

  6. #16
    Join Date: Jun 2018

    Location: Stafford UK

    Posts: 24
    I'm Andy.

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    Quote Originally Posted by Stryder5 View Post
    Point 1. Sub 1 or 2 will work, so the answers yes.

    Point 2. Some amplifiers have pre outs to feed a seperate power amp. The internal power amp is still connected. That is what's suggested in the second diagram. On the NAD there is a jumper that feeds the pre amp to the internal power amp but by using this you disconnect the power amp therefore the main speakers.

    Hope that makes sense.

    Gary
    Yeah it makes sense, cheers. I knew that the NAD came with external jumpers connecting the pre-out to the main-in, whereby removing them cuts sound output to the speakers. That's why I was confused by the connection guide in the sub's manual — I didn't think it would work that way.

  7. #17
    Join Date: Apr 2009

    Location: Melbourne

    Posts: 166
    I'm Alex.

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    Is ther a filter on your amplifier's sub-out. If not, your main speakers will be running full range, so you will need to adjust the crossover point on your sub and match level so that the bass is not overwhelming the sound from your speakers

  8. #18
    Join Date: Jun 2018

    Location: Stafford UK

    Posts: 24
    I'm Andy.

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    Quote Originally Posted by maxrob200 View Post
    Is ther a filter on your amplifier's sub-out. If not, your main speakers will be running full range, so you will need to adjust the crossover point on your sub and match level so that the bass is not overwhelming the sound from your speakers
    The speakers are rated to 55hz and the sub 34hz with crossover controls from 50hz to 150hz, so I set the controls to 55hz, right? This instructs the sub to only play bass sound that my speakers are unable to reproduce?

  9. #19
    Join Date: May 2016

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    I'm Gary.

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    Quote Originally Posted by ciderman9000000 View Post
    The speakers are rated to 55hz and the sub 34hz with crossover controls from 50hz to 150hz, so I set the controls to 55hz, right? This instructs the sub to only play bass sound that my speakers are unable to reproduce?
    It's a starting point, you have to use your ears. Try setting the sub to 55hz and turn the sub volume till its intrusive, then back off the volume slowly till the sub disappears. The speakers may not output to 55hz tho so you may have to play with that setting.

    As has been said before its time consuming but worth getting it right

    Gary

  10. #20
    Join Date: Apr 2012

    Location: N E Kent

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    I'm Geoff.

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    Quote Originally Posted by Stryder5 View Post
    It's a starting point, you have to use your ears. Try setting the sub to 55hz and turn the sub volume till its intrusive, then back off the volume slowly till the sub disappears. The speakers may not output to 55hz tho so you may have to play with that setting.

    As has been said before its time consuming but worth getting it right

    Gary
    That's right. Basically, disregard the figures and listen to what the speakers and sub are doing. It will become evident what settings work best.

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