Subwoofer output very low using line level but works great with high level ???

[Mystery]

I have a DCM TB1010 subwoofer and it works great with plenty power at 12 O'clock using speaker level inputs but when using RCA line level inputs, it's not even normal loud at full level on the plate amp.

What's going on? :scratch2:

Woofer 10"
Frequency Response 33-120Hz
Tuning Passive Radiator
Amplifier Power 100W
Input High/Line
Output Line
Phase Switch 0°/180°
Level Control Yes
Auto Turn-On Yes
Active Compression Circuit Yes
Low Pass Slope 24dB
Sub-sonic Filter 18dB@30Hz
Dimensions (HxWxD) 17-3/4" H x 14" W x 17-1/2" D

 

[Dr. Morbius]

Sounds to me like the signal strength from your preamp/subwoofer out isn't doing the job. Not enough voltage would be my guess.

 

[WaynerN]

Many preamps, mine included, has an adjustment for sub-woofer output in its menu.....

I also have to set the front speakers to "small" to get the sub-woofer to work at all.....

 

[Mystery]

The same preamp works with other subwoofers at the same volume with RCA in.
It's just this one I find with this much difference in line vs high level. :scratch2:

 

[Yamaki]

Just curious...what is the sub crossover set at?

 

[Mystery]

It's set 60 in the subwoofer using full range signal from pre-amp.

 

[Yamaki]

and where is the pre-amp crossover set at?

 

[Mystery]

and where is the pre-amp crossover set at?

??? full range.
The crossover is only in the sub.

 

[markshan]

The same preamp works with other subwoofers at the same volume with RCA in.
It's just this one I find with this much difference in line vs high level. :scratch2:

Since you've been swapping subs, could the RCA cable have gone bad?

 

[markshan]

Or perhaps a cold solder joint at the RCA jack on the DCM?