JL Audio Fathom F13

[wettou]

I am getting very little bass out of my sub!!

Help

[Glenee]

Need more info on hook-up. What is feeding the sub ? Have you told the processor that you now have a sub ? What about SPL output through the processor ? Hooked up RCA or XLR ? The other speakers amps being fed XLR or RCA from the proccesor ? Whats the crossover in the processor set too ? I have a JL F112. Too little info Wettou

[wettou]

Need more info on hook-up. What is feeding the sub ? Have you told the processor that you now have a sub ? What about SPL output through the processor ? Hooked up RCA or XLR ? The other speakers amps being fed XLR or RCA from the proccesor ? Whats the crossover in the processor set too ? I have a JL F112. Too little info Wettou

I think I found my problem my speakers where set to large! So I switch them to small and changed the crossover at 80HZ it was at 40HZ
- Sub hooked with RCA
- Amps XLR
- 5 Speakers (3) 802D and (2)802N
- Speaker set at 85db

I will rerun the calibration on the sub and see if that works better

[Glenee]

I think I found my problem my speakers where set to large! So I switch them to small and changed the crossover at 80HZ it was at 40HZ
- Sub hooked with RCA
- Amps XLR
- 5 Speakers (3) 802D and (2)802N
- Speaker set at 85db

I will rerun the calibration on the sub and see if that works better

I bet it does . I think the crossover was way to low at 40 hrz, not a lot of information in general in that range, except in movies and classical music maybe no information getting to the sub to respond. The Sub being used with the un-balanced RCA and the amps being run Balanced should also impose about a 5db drop to the sub. Meaning in your speaker calibration mode having to increase the sub alot.
Hope all goes well ,
Glenee

[wettou]

I bet it does . I think the crossover was way to low at 40 hrz, not a lot of information in general in that range, except in movies and classical music maybe no information getting to the sub to respond. The Sub being used with the un-balanced RCA and the amps being run Balanced should also impose about a 5db drop to the sub. Meaning in your speaker calibration mode having to increase the sub alot.
Hope all goes well ,
Glenee

So should I use XLR with the sub as well?

[Glenee]

So should I use XLR with the sub as well?

Yes, If you can.

[wettou]

Yes, If you can.

What will this do?

[Glenee]

Give you more Headroom on the balanced side, also it will make it dead quiet no shush or hum. Be sure to use a true balanced XLR cable, not a Mic cable. Many of the Mic cables (NOT All ) have one of the 3 conductors defeated. I found this out with a Amp that would go into defeat every time some Mic cables were plugged into it. If you look at the manual that came with the JL Sub the XLR connection is perferred.

[ribd1]

Maybe it's out of phase????

[wettou]

Give you more Headroom on the balanced side, also it will make it dead quiet no shush or hum. Be sure to use a true balanced XLR cable, not a Mic cable. Many of the Mic cables (NOT All ) have one of the 3 conductors defeated.

How can you tell if it is a true balanced XLR vs a Mic cable they have the same terminations?

[Glenee]

The only way I could tell is when the Amp kept defaulting, I opened it up and found 1 leg defeated. I then tried different XLR's that I had. All the ones that defaulted the Amp were sold as Mic cables. They also had 1 leg defeated. I got into some that were assembled for Audio all 3 legs in use. Blue Jeans Cable, Bettercables, all are good. I'm not saying they have to be expensive, just get the ones for Audio and not Mic cables. They will say on the package Mic Cable. I think defeating 1 Leg helps in crossover noise on a stage format.