Connecting Sub to Pre Out and than back to Recvr?

[bcycle]

Hi,

I'm running a subwoofer with a Parts Express SA240 Plate amp. I currently have my Yamaha RX-V2500's preamp out section connected to the sub's amp but is there a way to then take the sub low level (line out) back into the Yamaha? I want to see how my main speakers sound after the xover and with the Sub handling the bass. The problem is the Yamaha doesn't have a preamp input. Can I input it elsewhere like a multichannel input? Any other suggested inputs?

Thanks,

Greg

 

[Adam]

Greg,

Hi. I don't understand. The Yamaha can handle the bass management and take care of the cross-over for you. You shouldn't need to feed a signal back from the sub to the receiver. Some more info on what you're trying to accomplish would be helpful (at least to me).

Thanks.

Adam

 

[mtrycrafts]

Hi,

I'm running a subwoofer with a Parts Express SA240 Plate amp. I currently have my Yamaha RX-V2500's preamp out section connected to the sub's amp but is there a way to then take the sub low level (line out) back into the Yamaha? I want to see how my main speakers sound after the xover and with the Sub handling the bass. The problem is the Yamaha doesn't have a preamp input. Can I input it elsewhere like a multichannel input? Any other suggested inputs?

Thanks,

Greg

If I understand your connection path, pre out from one of the channels, then feed the signal above sub frequencies back into that channels analog in?
That will not work as you would have to select that input then.
Best to do what was suggested by Adam.

 

[bcycle]

Greg,

Hi. I don't understand. The Yamaha can handle the bass management and take care of the cross-over for you. You shouldn't need to feed a signal back from the sub to the receiver. Some more info on what you're trying to accomplish would be helpful (at least to me).

Thanks.

Adam

Thanks Adam,

I'm trying to see how the sub sounds as part of the front speakers when listening in Yamaha's "Pure Direct" mode. (When in surround modes the Yamaha doe not send a signal from the Sub output). The line level option seemed the (simplest and perhaps best sounding) way to go if there's a way to get line level out signal from the SW amp back into the Yamaha somehow.

So in summary: I'm trying to see how the sub sounds NOT for surround sound. I want the sub to take care of the low bass and my main speakers to handle the rest after the sub's xover. I could run my speaker wire to the high level inputs on the sub amp and then from the high level outputs to my main speakers to achieve this but I wanted to see if this can be done using line level connections.

The Receiver has multi channel inputs as well extra aux, tape (etc) inputs. I think the user can also reconfigure the inputs and I'm wondering if this can be done so the input acts as a "Preamp In".

Greg

 

[bcycle]

If I understand your connection path, pre out from one of the channels, then feed the signal above sub frequencies back into that channels analog in?
That will not work as you would have to select that input then.
Best to do what was suggested by Adam.

You are correct sir! In essence, I'm trying to determine if there's a way to make one of the myriad of inputs on the Yamaha behave like a preamp in. There's some configurability on this Receiver's inputs (I/O mode, multichannel input, etc.) but I have know idea if these features will help me do this.

Thank,s

Greg

 

[MDS]

All of the inputs on the receiver are 'pre-amp in'.

What you are trying to do is loop an already processed signal back into the pre-amp section so you can hear it without changing from the original input. The only way I can see for that to work is if the receiver has a tape monitor loop.

 

[j_garcia]

You do not gain anything by using the sub's x-over vs the one in the receiver unless your receiver's is higher than the sub's and fixed also. The x-over adjustment on the sub only affects the low pass.

 

[bcycle]

You do not gain anything by using the sub's x-over vs the one in the receiver unless your receiver's is higher than the sub's and fixed also. The x-over adjustment on the sub only affects the low pass.

So your saying that the signal simply gets passed through the crossover and the crossover just picks up the low frequencies, and that my main speakers see the full bandwidth of signal?

Thanks,

G

 

[mtrycrafts]

You are correct sir! In essence, I'm trying to determine if there's a way to make one of the myriad of inputs on the Yamaha behave like a preamp in. There's some configurability on this Receiver's inputs (I/O mode, multichannel input, etc.) but I have know idea if these features will help me do this.
Thank,s
Greg

How about this, for your experiment.
If that sub has speaker level inputs and outputs, then you can use one of the front channel's speaker cable to the sub speaker level in, the sub will take care of the lows, and then the speaker level out to the speaker and it will handle the signals the sub bypassed.
This is your only option left with what you are trying to do without the amp input on the receiver for that channel.
Or, just thought of another out for you, is getting an external amp and use the sub out to the amp in and that amp to that speaker you are experimenting with.

 

[j_garcia]

So your saying that the signal simply gets passed through the crossover and the crossover just picks up the low frequencies, and that my main speakers see the full bandwidth of signal?

No, usually the sub has a high pass because there is no need for a full range pass through. It will be around 80Hz if you are lucky, and it is fixed at that point. Adjusting the x-over only affects what the sub plays, not what is fed back out to the mains.

 

[bcycle]

How about this, for your experiment.
If that sub has speaker level inputs and outputs, then you can use one of the front channel's speaker cable to the sub speaker level in, the sub will take care of the lows, and then the speaker level out to the speaker and it will handle the signals the sub bypassed.
This is your only option left with what you are trying to do without the amp input on the receiver for that channel.
Or, just thought of another out for you, is getting an external amp and use the sub out to the amp in and that amp to that speaker you are experimenting with.

The external amp would be ideal if I had the $$$. Otherwise I thought there might be a way to fool the Yamaha into thinking it has a pre amp in by "reconfiguring" an input. And I believe a preamp-in bypasses the receiver's preamp section and inputs straight to the amp so the only component between the signal and the component's amp will be the preamp section of the Sub amp. I've seen preamp inputs & outputs on integrated amps so I thought I might have both sets on my receiver but noooooooooo.

Going into the high level inputs is my second choice. The downside is (correct me if I'm wrong) is that the preamp noise is doubled + you're inserting amp noise as well. Ah well, sounds like that's the way to go since I don't have a line/in line out option.

Thanks,

Greg

 

[MDS]

And I believe a preamp-in bypasses the receiver's preamp section and inputs straight to the amp so the only component between the signal and the component's amp will be the preamp section of the Sub amp. I've seen preamp inputs & outputs on integrated amps so I thought I might have both sets on my receiver but noooooooooo.

A pre-out is before the amplifier; ie the signal goes out of the pre-amp before it gets amplified. A 'pre-in' would be into the pre-amp and your receiver has lots of them - Video, CD, DVD, Tape, etc.

Integrated amps do often contain the ins and outs you want but they will be called pre-out and main-in (or amp-in). Perhaps a used integrated amp would do for your experiment.

 

[mtrycrafts]

Going into the high level inputs is my second choice. The downside is (correct me if I'm wrong) is that the preamp noise is doubled + you're inserting amp noise as well. Ah well, sounds like that's the way to go since I don't have a line/in line out option.

Thanks,

Greg

The high level input on a sub is from your speaker terminals. The sub amp sends it through the crossover, reduces the input signal and then reamplifies the sub signals. The signal to the main speaker is hi cut and sent to it.
The noise levels are very low to begin with and you are only adding a fraction of that noise in the sub. Besides, ear sensitivity at low frequency is poor, hence the sub testing at 10% THD.