LSi15 crossover settings

reberly

I have Front LSi15 and Center LSiC speakers hooked to an Onkyo TX-SR805 with a MartinLogan Dynamo Sub.

I would like to know what crossover setting I should use on my receiver setup for my front and center speakers. My options for front are Full/40/50/60/70/80/90/100/120/150/200 and the same for the center expect the "full" setting

Maybe out of your expertise but I also have a setting in the receiver setup called LPF of LFE That can be set to 80/90/100/120 and I dont know what it should be set for

Thank you in advance

bdaley6509

I believe 80 is THX specs...that's what I use and it seems to work.

VSchneider

Who said THX was an authority here? :-)

Try 60 -70 -80, and stay with what sounds best to you, reberly. I'd think higher will be better for the center and lower for fronts. These are what's called "high-pass filters" and will cut frequency below specified for each speaker and send to your sub.

LPF ("low-pass filter") of LFE ("sub") should be set to match or above the highest filter you set for your other speakers so that you don't have any gaps.

THX 80Hz spec is a simplified option, but generally works well, and your receiver goes one step further allowing you to cross each speaker at different frequencies.

jrlouie

I'd also take into account that you are driving a set of Lsi15's with an Onkyo reciever rather than a dedicated amp. The lower you go on your crossover, the harder you will be working your receiver. You may find that 80hz provides a cleaner overall sound than something lower, allowing your sub to handle more of the bass. This also depends on the capabilities of your sub.
Maybe start with 80, and vary it some and see what sounds cleanest.

reberly

Thanks everyone who replied. I can see from the slightly different responses there is a general accepted setting and from there it's experimentation.

On the post about using just a onkyo reciever currently. When do I know when I need to add a dedicated amp. Currently I am only running the sub,FL&R,Center. No rears currently because of my 18' vaulted ceilings without an attic/crawlspace.

jrlouie

I'm kind of the opinion that it is somewhat subjective. The thing with the Lsi's (any of them) is that they can continue to sound better and better with the higher quality sources you provide. So, chances are you won't be seeing what they can really do if using a receiver, but I used a receiver for a while and was happy at the time. But, I was also happily impressed when I added separate amplification. Just remember not to drive any amplification (receiver or external amp) into clipping/distortion. That's when you'll start having problems.