Tuning new subwoofer

[Avocheeseado]

Hi, I have recently bought the Edifier R1700BTSs and the edifier T5 sub to go along with it.

The sub has a volume dial, phase switch (0 or 180) and a low pass filter dial - I am not sure what the phase switch does, or to tell whether I need it or not.

Also what is the best frequency to have the LPF at?

 

[Hairless Monkey Boy]

11 minutes ago, Avocheeseado said:

I am not sure what the phase switch does, or to tell whether I need it or not.

If you have only 1 sub, you don't need to touch it. It's for adjusting the phase of multiple subs so they work best with each other.

12 minutes ago, Avocheeseado said:

Also what is the best frequency to have the LPF at?

Usually ~80Hz is a good place to start. You can use the R1700BTs frequency response to inform your choice. If you can configure a crossover with whatever you are using to drive the speakers, that would be best. Otherwise, whatever sounds best to you. 

[Dedayog]

As above, 80Hz is common.  Without getting a meter actually measuring SPL.

[Derkoli]

3 hours ago, Avocheeseado said:

Hi, I have recently bought the Edifier R1700BTSs and the edifier T5 sub to go along with it.

The sub has a volume dial, phase switch (0 or 180) and a low pass filter dial - I am not sure what the phase switch does, or to tell whether I need it or not.

Also what is the best frequency to have the LPF at?

 

Judging by the frequency response of your mains,

 

 

Set the LPF to 80Hz.

 

Set the phase by listening to some music and fiddling with it. What ever settings sounds best, keep it to that.

 

If you have the methods to measure your systems FR available, then use whatever setting measures best.

[geo3]

8 hours ago, Hairless Monkey Boy said:

If you have only 1 sub, you don't need to touch it. It's for adjusting the phase of multiple subs so they work best with each other.

Not true. You also want it to be in phase with your mains at the crossover point. This will depend largely on placement of the sub relative to the listener and mains as well as the room interaction. There's just no way guess if it's needed or not. You have to run a frequency sweep with a mic and software like REW to really see what's going on.  Or do it by ear if you know what you're listening for. 

 

5 hours ago, Derkoli said:

 

Set the LPF to 80Hz.

Actually for that graph I'd go with 60~70.  At 80Hz that hasn't begun to drop off at all, you're going to get a hump in the response as the 2 sum there.  The goal is to have them cross at each others 3db down point. 

[Derkoli]

19 hours ago, geo3 said:

Actually for that graph I'd go with 60~70.  At 80Hz that hasn't begun to drop off at all, you're going to get a hump in the response as the 2 sum there.  The goal is to have them cross at each others 3db down point.

Good point.

 

I'd do 60-70 then aswell.

[Ahoy Hoy]

Tried to found response for the sub. Found this on a forum from a recording.

Id also recommend lower cross over. 60 70 mark should be good, I wouldnt go higher then that as the two speakers with the peak at 150hz on the main would make it very thumpy.