Since noone respone in CAr Audio, I am posting this to here also.
Somebody had already known that I built a sonotube sub for my car, but I have problems after a month of tuning.
This sub is running pretty good with my Blaupunkt PA2150, a 180W 2channels/ 400W bridged amp, in my 96 Honda Civic coupe.
However, I started to notice the sub was like cliping ( or maybe it isn't) as soon as I opened up the trunk lip. Is it really cliping?
This is my first setting:
HU: High pass 170Hz cut off, Low Pass thou
sub amp: Low Pass 250Hz cut, the maximum of the low pass (from 50-250Hz)
It sounded really good although some bass might sound muddy, the high pass 170Hz made the front speakers sound good, and the sub could really intergate into my car without noticing it. I can notice the quality of bass from the sub is way better than my 6 speakers woofer units. Eventhough it sound good in the car, I notice some weird sound when I listern to the sub from the opened trunk.
This is my 2nd setting:
HU: HP 100Hz, LP thou
Amp: LP 100Hz
After playing around with the setting of LP in the amp, I came up a solution that the weird sound will be elimate when I set the LP to 120 or lower. However my sub FR rating is 40Hz-500Hz, how come it sound weird after 120Hz, and it sound prefectly fine with 120 to lower with whatever setting of the V into the amp.
Ok, finally I came up these possibility:
1. the sub is in isobaric system so it can't handle higher than 120Hz. This is a guess only.
2. My sub enclouse is too small that affect the FR, and I think this is the most possible.
3. My sub amp have problem which is already underpower, but I don't see this to be a problem that the 120Hz to lower won't souind weird or clip in the lowest to the highest setting of the V in on the amp
These is the spec of the Sub, amp and hu. I have a sonotube sealed sub in a little bit small than 1.25ft/cu enclouse.
Subwoofer driver: JBL LC-S1200W
specifications
Recommended Amplifier Power Range: 12-200W
Sensitivity: 91dB
Frequency Response: 40Hz¡V500Hz
Mounting Depth: 5" (127mm)
Cut-out Diameter: 10-3/4" (273mm)
Thiele and Small Parameters
Nominal Impedance: 4 Ohms
Revc: 3.45 Ohms
Fs: 27.4Hz
Vas: 124 Liters
Qms: 3.18
Qes: 0.37
Qts: 0.33
Mms: 109.2g
Levc: 2.2mH
Sealed-Enclosure Specifications
Enclosure Volume 1.25 cu. ft. (35.88 Liters)
HU: Kenwood KDC-MPV5205 MP3/CD reciever:
- Preout Level/load (During Disc Play):
2000 mV /10 kOhm
- Preout impedance:
< 600 Ohm
Amp: Blaupunkt PA2150 Class T Amplifier
"Birth Certificate"
1.RMS output power : bridged (4Ohm) @ 1.0% THD
= Min power in any channel 480 Wrms.
2.RMS output power : non-bridged (2Ohm) @ 1.0% THD
= Min power in any channel 180 Wrms.
3.@ Rated power, bridged mode - 51 Amps
4.@ Rated power, non-bridged mode - 32 Amps
5.@ 33% rated power, non-bridged mode - 11 Amps
6.@ 10% rated power, non-bridged mode - 5 Amps
7.@ idle - 1.5 Amps
8.@ Rated power, non-bridged
A weighted
Average Value for all channels >100db
Somebody had already known that I built a sonotube sub for my car, but I have problems after a month of tuning.
This sub is running pretty good with my Blaupunkt PA2150, a 180W 2channels/ 400W bridged amp, in my 96 Honda Civic coupe.
However, I started to notice the sub was like cliping ( or maybe it isn't) as soon as I opened up the trunk lip. Is it really cliping?
This is my first setting:
HU: High pass 170Hz cut off, Low Pass thou
sub amp: Low Pass 250Hz cut, the maximum of the low pass (from 50-250Hz)
It sounded really good although some bass might sound muddy, the high pass 170Hz made the front speakers sound good, and the sub could really intergate into my car without noticing it. I can notice the quality of bass from the sub is way better than my 6 speakers woofer units. Eventhough it sound good in the car, I notice some weird sound when I listern to the sub from the opened trunk.
This is my 2nd setting:
HU: HP 100Hz, LP thou
Amp: LP 100Hz
After playing around with the setting of LP in the amp, I came up a solution that the weird sound will be elimate when I set the LP to 120 or lower. However my sub FR rating is 40Hz-500Hz, how come it sound weird after 120Hz, and it sound prefectly fine with 120 to lower with whatever setting of the V into the amp.
Ok, finally I came up these possibility:
1. the sub is in isobaric system so it can't handle higher than 120Hz. This is a guess only.
2. My sub enclouse is too small that affect the FR, and I think this is the most possible.
3. My sub amp have problem which is already underpower, but I don't see this to be a problem that the 120Hz to lower won't souind weird or clip in the lowest to the highest setting of the V in on the amp
These is the spec of the Sub, amp and hu. I have a sonotube sealed sub in a little bit small than 1.25ft/cu enclouse.
Subwoofer driver: JBL LC-S1200W
specifications
Recommended Amplifier Power Range: 12-200W
Sensitivity: 91dB
Frequency Response: 40Hz¡V500Hz
Mounting Depth: 5" (127mm)
Cut-out Diameter: 10-3/4" (273mm)
Thiele and Small Parameters
Nominal Impedance: 4 Ohms
Revc: 3.45 Ohms
Fs: 27.4Hz
Vas: 124 Liters
Qms: 3.18
Qes: 0.37
Qts: 0.33
Mms: 109.2g
Levc: 2.2mH
Sealed-Enclosure Specifications
Enclosure Volume 1.25 cu. ft. (35.88 Liters)
HU: Kenwood KDC-MPV5205 MP3/CD reciever:
- Preout Level/load (During Disc Play):
2000 mV /10 kOhm
- Preout impedance:
< 600 Ohm
Amp: Blaupunkt PA2150 Class T Amplifier
"Birth Certificate"
1.RMS output power : bridged (4Ohm) @ 1.0% THD
= Min power in any channel 480 Wrms.
2.RMS output power : non-bridged (2Ohm) @ 1.0% THD
= Min power in any channel 180 Wrms.
3.@ Rated power, bridged mode - 51 Amps
4.@ Rated power, non-bridged mode - 32 Amps
5.@ 33% rated power, non-bridged mode - 11 Amps
6.@ 10% rated power, non-bridged mode - 5 Amps
7.@ idle - 1.5 Amps
8.@ Rated power, non-bridged
A weighted
Average Value for all channels >100db