Subwoofer hook up to tube IA advice needed

[shang]

I've just recently acquired a Prima Luna Dialogue Premium intergrated amplifier. It does have a sub out single rca output on the back. I'm connecting it to a Polk DSW Pro 660wi subwoofer.

My issue is if I use the single(mono) sub out from the PL to the Polk line in LFE, I would have to set the LFE button on for the Polk, which then disables the Low Filter Pass Control. As most AV receivers have crossover controls, this would not be an issue... but the PL is strictly a 2 channel integrated w/ no tone controls...nor any control of the sub out.

so my questions are....

1-what frequency does the PL send to the Polk? like from 120hz down? I've sent PL and email, but was wondering if anyone on AK knows....

2-and would this not overlap frequency output from the mains and my sub as my speakers(Boston Acoustics T1030 get down to 40hz) and thus cause too much bass?

3- alternatively, can I safely hook up a rca y splitter( single male to 2x female) out of the PL sub out .... into the 2 Polk line in jacks.... thus leaving the LFE off and then able to use the Polk's Low Filter Pass Control?

4- does splitting the signal out of an RCA output jack adversely affect the signal in terms of quality, volume, etc? any crazy wiring issues I should be alerted to? dont' really want to damage any of the components....

Thanks in advance to any and all replies!!!

 

[Freddymac2]

If you connect the left and right B set of outputs to the polk in connections, it will create a low level signal to drive the woofer. It doesn't draw any current so you can use any wire. You can also feed pre out L & R to the Polk's summing circuit if that model has one. Set the crossover as low as you can about 60 or 70hz you only want to hear it when low frequency is there.

 

[whoaru99]

My issue is if I use the single(mono) sub out from the PL to the Polk line in LFE, I would have to set the LFE button on for the Polk, which then disables the Low Filter Pass Control. As most AV receivers have crossover controls, this would not be an issue... but the PL is strictly a 2 channel integrated w/ no tone controls...nor any control of the sub out.

No, you do not have to set the switch to LFE Yes to use the input. That only means to turn it on if you are using external bass management. You are not using external bass management so use the LFE/R input and put the switch to "No". Then you can use the sub's low pass filter control.

1-what frequency does the PL send to the Polk? like from 120hz down? I've sent PL and email, but was wondering if anyone on AK knows....

2-and would this not overlap frequency output from the mains and my sub as my speakers(Boston Acoustics T1030 get down to 40hz) and thus cause too much bass?

3- alternatively, can I safely hook up a rca y splitter( single male to 2x female) out of the PL sub out .... into the 2 Polk line in jacks.... thus leaving the LFE off and then able to use the Polk's Low Filter Pass Control?

4- does splitting the signal out of an RCA output jack adversely affect the signal in terms of quality, volume, etc? any crazy wiring issues I should be alerted to? dont' really want to damage any of the components....

Thanks in advance to any and all replies!!!

1. Don't know. Since the LPF is not stated it could even be a full range, summed mono output. Even if it was a common frequency like 80Hz or 120Hz, or full range, doesn't really matter since it sounds like you're wanting to be lower than that anyway. You mentioned your speakers get down to around 40Hz, so 50Hz-60Hz on the sub LPF is probably a good place to start. Tweak from there.

2. Your mains are going to run full range regardless if there is a LPF or full range signal at the mono sub output of the Primaluna. Adjusting the sub's LPF and volume to blend as best possible with the mains is what you'll need to do. See #1.

3. Yes, you could, but don't bother. As mentioned previously, just use the LFE/R input and put the switch to "No".

4. No it doesn't, but refer to #3.