Hello! From above, sorry from too long entry, I wanted to present my problem well. And I'm asking for advice 
.
I have weird problem of bass from subwoofer. I fight with this about 4 years On two cars: Mazda 323f Ba and Mazda 6.
Sometimes bass is much better and softer. and sometimes i can feel better presure, but car body shake is the same. Mostly my bass sound is SH*T (sorry).
I see voltage, and if bass is very very nice, no diference with voltage drops ( Reading from amp terminal)
Voltage drops are small, so, its cant be a problem
My system on today:
Mazda 6 2007r Wagon 2.0.
Hifonics BRX 12000 + Audio System XIon 15-1000 (Wired 2 ohm)
Rodek 2180A + STX pa 1000 coppy on rear seats (Sorry, its not good but should not make problems, on mazda 323f ba the music was from the doors and this same problem)
My Head Unit is now alpine cde 178bt
My power:
- Lithium YINLONG 2 Packs (80ah) in trunk
-Alternator 300a (14,5 - 15,4V)
Wires Power:
- 2x 50mm2 from alt to batt (Sorry i dont know how Ga or Awg, I;m from polen) All wires 100% copper
- Sub Amp Hifonics 2x 50mm from terminalls (about 0,70m lenght)
- Rodek 1x 16mm2
Grounds Wires:
-1x 50mm2 from alt to chasis, and from chasis to batt
-1x 50mm2 from engine to chasis, and from chasis to batt
- 2x 50mm2 from battery to nearest chasis point
- Hifonics Grounds 2x 50mm2 is from lithium batt terminall, per ground wire is about 1,5M lenght (its problem? too long?)
Problem is going on this two amps, amp from music i have too diference with bass, are louder can be.
I checked:
- Grounds, looks nice
- Connections fuse, power wires, Sub speaker wires. (no lose)
-Rca connections on HU and amp, very tightly.
About this 4 years i tested:
Much amps (Emphaser ea 2500, Vibe Mono 21k, kicx ad 1.400)
Subs (2x 15 excursion sxx 15v2, Pa subwoofer, clarion sw 3012)
3-4 of PCS rca (I now from sub have Pride diamond)
Kenwood x7200dab Hu, and pioneer 3500ui.
Speaker wires.
Sometimes bass loud and soft can back but not always if:
I REconnect amp power
Change Port subwoofer (to lower or higher tuning)
Bass can back if i a few times put subwoofer to trunk, roof, trunk roof, trunk roof, can sounds be better.
Bass like run away, if most offen i restart engine.
Today i checked all connections, In sub box terminal very nice
tightened. Speaker wires are good.
I have a osciloscope, no distortions from hu and amps but:
My weird looks:
Volume on hu max 35
to 10 sound bass going up, 10 to 15 stop to sub, but music going up WFT?
I tried to see voltage output from hu, and i have problem to Get nice output voltage,
Cliping at 4,4v, but i put Preamp source USB is FULL, and i have full no cliped voltage about 4 volts on 32-33V on radio with Bass boostloudness off and flat EQ.
On aux From my xiaomi on full preamp source on hu, i have on good music max 1,2v.
I Set my gains property clean, with full clean voltage output Hu, but with sound quality and hitting bass, no diferences...
Any questions? Too long grounds amps? Thanks.
.
I have weird problem of bass from subwoofer. I fight with this about 4 years On two cars: Mazda 323f Ba and Mazda 6.
Sometimes bass is much better and softer. and sometimes i can feel better presure, but car body shake is the same. Mostly my bass sound is SH*T (sorry).
I see voltage, and if bass is very very nice, no diference with voltage drops ( Reading from amp terminal)
Voltage drops are small, so, its cant be a problem
My system on today:
Mazda 6 2007r Wagon 2.0.
Hifonics BRX 12000 + Audio System XIon 15-1000 (Wired 2 ohm)
Rodek 2180A + STX pa 1000 coppy on rear seats (Sorry, its not good but should not make problems, on mazda 323f ba the music was from the doors and this same problem)
My Head Unit is now alpine cde 178bt
My power:
- Lithium YINLONG 2 Packs (80ah) in trunk
-Alternator 300a (14,5 - 15,4V)
Wires Power:
- 2x 50mm2 from alt to batt (Sorry i dont know how Ga or Awg, I;m from polen) All wires 100% copper
- Sub Amp Hifonics 2x 50mm from terminalls (about 0,70m lenght)
- Rodek 1x 16mm2
Grounds Wires:
-1x 50mm2 from alt to chasis, and from chasis to batt
-1x 50mm2 from engine to chasis, and from chasis to batt
- 2x 50mm2 from battery to nearest chasis point
- Hifonics Grounds 2x 50mm2 is from lithium batt terminall, per ground wire is about 1,5M lenght (its problem? too long?)
Problem is going on this two amps, amp from music i have too diference with bass, are louder can be.
I checked:
- Grounds, looks nice
- Connections fuse, power wires, Sub speaker wires. (no lose)
-Rca connections on HU and amp, very tightly.
About this 4 years i tested:
Much amps (Emphaser ea 2500, Vibe Mono 21k, kicx ad 1.400)
Subs (2x 15 excursion sxx 15v2, Pa subwoofer, clarion sw 3012)
3-4 of PCS rca (I now from sub have Pride diamond)
Kenwood x7200dab Hu, and pioneer 3500ui.
Speaker wires.
Sometimes bass loud and soft can back but not always if:
I REconnect amp power
Change Port subwoofer (to lower or higher tuning)
Bass can back if i a few times put subwoofer to trunk, roof, trunk roof, trunk roof, can sounds be better.
Bass like run away, if most offen i restart engine.
Today i checked all connections, In sub box terminal very nice
tightened. Speaker wires are good.
I have a osciloscope, no distortions from hu and amps but:
My weird looks:
Volume on hu max 35
to 10 sound bass going up, 10 to 15 stop to sub, but music going up WFT?
I tried to see voltage output from hu, and i have problem to Get nice output voltage,
Cliping at 4,4v, but i put Preamp source USB is FULL, and i have full no cliped voltage about 4 volts on 32-33V on radio with Bass boostloudness off and flat EQ.
On aux From my xiaomi on full preamp source on hu, i have on good music max 1,2v.
I Set my gains property clean, with full clean voltage output Hu, but with sound quality and hitting bass, no diferences...
Any questions? Too long grounds amps? Thanks.
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