Sub connection to a stereo amplifier

[matengawhat]

i want to try connecting a sub to my stereo amp - i was going to use the pre outs on my Arcam P35 power amp - they are set up in a mono formation does this matter - do i connect just one sub cable to the sub from the P35 pre outs or do i use a pair of interconnect and if so do i take both the left and right out of one power amp or because they are in a mono formation do i need to take the left from one P35 and the right from the other - the sub is an arcam logo.

hope that all makes sense?

 

[matengawhat]

sorry just read up - i know i need to get both left and right pre out to sub as stereo has no lfe out - but if the p35s are in mono formation with they still output left and right from pre outs or do i need to take one cable from each

also anyone know what is best to set the crossover to - my specs for speakers says low frequency point is 45hz so would you set the sub to that?

 

[matengawhat]

sorry just noticied a lot of talk about subs so thought would bump this

 

[Anonymous]

In my limited experience of setting up subs, I've found that setting the sub roll-off to slightly overlap the speaker roll-off works well. Thus, try yours at 50-60hz with a volume setting so that you can only just notice it. Tricky old game this one though. Subject to personal taste of course!

 

[Andrew Everard]

I'd use the pre-outs on your preamp if it has a spare pair, or invest in some phono splitters and use these from the preamp outs to feed your power amps and both sub inputs if your preamp only has a single set of preouts.

And yes, about 50-60Hz should give you a smooth handover from sub to main speakers. But how much of a benefit the Arcam sub will be really depends on the main speakers you'll be using it with.

 

[matengawhat]

do subs have a direct input mode - for example can i connect the lfe to my av amp and the left/rights to my stereo and would one be dominent - just wondering incase ever accidently turn both on at once - imagine would be messy

also what about the x-over q and phase settings?

 

[matengawhat]

Andrew Everard:
I'd use the pre-outs on your preamp if it has a spare pair, or invest in some phono splitters and use these from the preamp outs to feed your power amps and both sub inputs if your preamp only has a single set of preouts.

And yes, about 50-60Hz should give you a smooth handover from sub to main speakers. But how much of a benefit the Arcam sub will be really depends on the main speakers you'll be using it with.

pre amp is MF A5CR so only has one set of out - my main speakers are focal 908s

just realised with the mono links in can't use the pre outs so would have to get splitters