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TOPIC: SHD and integrativo with Sub

SHD and integrativo with Sub 8 months 1 week ago #46045

  • raindog
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Hi folks
I hope you had a great start for this new year. I'm having a doubt with my velodyne dd10+. How do i connect It to the SHD? Do i use only One cable or i must connect both Channel? Thanks
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SHD and integrativo with Sub 8 months 1 week ago #46054

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raindog wrote:
Hi folks
I hope you had a great start for this new year. I'm having a doubt with my velodyne dd10+. How do i connect It to the SHD? Do i use only One cable or i must connect both Channel? Thanks
I would use one cable but in the SHD signal routing you want to send both the left and right inputs to this single output.

Edit: this is what I do with my sub.
Last Edit: 8 months 1 week ago by Ultrasonic.
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SHD and integrativo with Sub 6 months 6 days ago #47261

Connecting to both the left and right channels of a mono sub will bridge the subwoofer amp internally. In other words, the amp will run in monoblock mode. Output power will increase by roughly 3dB (i.e. double the power output), impedance and damping factor will be halved.

You may want to try both ways to see which you prefer.
Last Edit: 6 months 6 days ago by audiobomber.
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SHD and integrativo with Sub 6 months 6 days ago #47265

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audiobomber wrote:
Connecting to both the left and right channels of a mono sub will bridge the subwoofer amp internally. In other words, the amp will run in monoblock mode. Output power will increase by roughly 3dB (i.e. double the power output), impedance and damping factor will be halved.

This is not correct. Subwoofers only ever have mono amplifiers, not a stereo amp that can be bridged.
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SHD and integrativo with Sub 6 months 6 days ago #47266

Then how do you explain this?

1. Low-Level Inputs (Left/Right)
RCA style jacks that will accept standard line level inputs from
a pre-amp level source. They will accept a stereo signal and
internally combine it into mono. Both left and right input jacks
must be connected to the source in order to drive the amplifier
to full output. www.parts-express.com/pedocs/manuals/300...io-spa250-manual.pdf
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SHD and integrativo with Sub 6 months 6 days ago #47272

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audiobomber wrote:
Then how do you explain this?

1. Low-Level Inputs (Left/Right)
RCA style jacks that will accept standard line level inputs from
a pre-amp level source. They will accept a stereo signal and
internally combine it into mono. Both left and right input jacks
must be connected to the source in order to drive the amplifier
to full output. www.parts-express.com/pedocs/manuals/300...io-spa250-manual.pdf

Summing line level inputs is completely different to bridging an amp.
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SHD and integrativo with Sub 6 months 6 days ago #47273

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audiobomber wrote:
Both left and right input jacks
must be connected to the source in order to drive the amplifier
to full output. www.parts-express.com/pedocs/manuals/300...io-spa250-manual.pdf

Is there a particular part of the manual you linked to which you believes proves the statement before the link? It's certainly not true of typical subwoofer amplifiers and I'd be very surprised if it was for the Dayton too...
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SHD and integrativo with Sub 6 months 5 days ago #47279

Ultrasonic wrote:
Is there a particular part of the manual you linked to which you believes proves the statement before the link? It's certainly not true of typical subwoofer amplifiers and I'd be very surprised if it was for the Dayton too...
The quote is from Page 2 in the manual, "INPUT/OUTPUT CONNECTION".
He also mentions to connect to both Left and Right RCA connections at the beginning of this video:

I know what you're saying, and that is what I thought as well, until I read the above instruction. Bridging is the only explanation I know of that would allow higher output by connecting to both L-R input leads, given that the amp only has one pair of outputs (i.e. cannot drive a dual voice coil woofer).
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SHD and integrativo with Sub 6 months 5 days ago #47281

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I think Ultrasonic is right here. All Dayton is doing is just summing the L and R inputs then divide by 2 to keep line level correct in the derived sub channel. So if you use only one input, your drive will be potentially half line level and your power 6dB down.
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SHD and integrativo with Sub 6 months 5 days ago #47282

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Nope, there's no bridging here. The two RCA inputs are a simple summing network. You can use either or both. +6db relative gain if you use both.....assuming the left and right input signals were identical.

Bridging is something completely different and would require two, separate, amplifier channels. You don't have that here.

Dave.
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SHD and integrativo with Sub 6 months 5 days ago #47287

OK, that explains it, my bridging explanation was wrong. It still mitigates for using both RCA inputs though, correct?
Last Edit: 6 months 5 days ago by audiobomber.
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SHD and integrativo with Sub 6 months 5 days ago #47288

Duplicate post
Last Edit: 5 months 2 weeks ago by audiobomber.
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SHD and integrativo with Sub 6 months 5 days ago #47292

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OK, I can see where the confusion is coming from here. The relevant bit of the Dayton manual states the following:

1. Low-Level Inputs (Left/Right)
RCA style jacks that will accept standard line level inputs from
a pre-amp level source. They will accept a stereo signal and
internally combine it into mono. Both left and right input jacks
must be connected to the source in order to drive the amplifier
to full output.
Note: If using a LFE output from a preamp or
receiver connect it to the Left (mono) input.


The two sentences in bold must critically be read together. IF the only available input signal is stereo then you should connect both left and right channels to the subwoofer. If this is not done then you would be losing (roughly) half of the low frequency signal level. Note that this relates to just giving the sub the correct input signal rather than relating to the performance of the sub or its amplifier, and does not affect the maximum output possible from the sub.

Now if you look back to my first reply to the thread you'll see that I suggested that the OP used a single cable but crucially said that the signal routing within the SHD should be used to combine the left and right channel signals so that this sum is then sent down the single cable to the sub. Both channels are still sent to the sub so the signal level is correct but this is achieved by using the capability of the SHD rather than this sum being performed at the sub inputs.

Does this make sense?
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