Hi !!
I made two GainClone amps (3886) that will drive four 3,5" 20W 4Ohms speakers, with 300Hz of frequency cut (300 - 20.000hz).
http://www.diyaudio.com/forums/showthread.php?s=&postid=806360#post806360
Now, I'm gonna make an c200 amp that is 200W RMS, but it will run with lower voltage, so, it will be around 100 ~ 130 W. This amp will drive a 12 inch 125W 4Ohms Subwoofer.
The Subwoofer will be cutted at 300Hz with an Active crossover (like the speakers), from elliot's page.
I want SMOOTH and EXTEND bass, nothing noisy pleeease !
I choiced the 12 inch sub, because I don't want any distortion, so It will be (I hope so) able to deliver the bass that I want, with low volume, so, none distortion, lower heat, lower power consuption...
As I said, I DO NOT want hard and noisy bass, I do not want sound pressure ! I want the most plain frequency response possible from 20 to 300hz
I want Sound Quality, to listen Blues, Jazz, Classical and etc.
The room isn't small, but isn't that big too...
If you think that 10 inch sub is enough, please, tell me !
I know I have many questions, but the first is: Vented or Sealed?
edit: Oh ! How could I forget?
Subwoofer specifications:
125W RMS
4 Ohms
4Kg
- Fs (free air ressonance): 26.5 Hz
- Qts ("Q" total of the sub): 0.5086
- Vas (equivalent conformity): 4.44 PC / 125.36 L
- Recommended Current Power: 40-125W
- Deslocated Volume (cubic foots PC ): 0.057 PC / 1.6 L
- Qes: 0.5281
- Qms: 13.81
- Sd: 0.0523 (m2)
- Re: 3.4 (ohm)
- Xmax: 7.50 (mm)
- Sensibility: 87 dB (1watt/1meter)
- BL: 10.88 (N/A)
- Zo (Maximium Impedance): 92.3 (ohm)
I made two GainClone amps (3886) that will drive four 3,5" 20W 4Ohms speakers, with 300Hz of frequency cut (300 - 20.000hz).
http://www.diyaudio.com/forums/showthread.php?s=&postid=806360#post806360
Now, I'm gonna make an c200 amp that is 200W RMS, but it will run with lower voltage, so, it will be around 100 ~ 130 W. This amp will drive a 12 inch 125W 4Ohms Subwoofer.
The Subwoofer will be cutted at 300Hz with an Active crossover (like the speakers), from elliot's page.
I want SMOOTH and EXTEND bass, nothing noisy pleeease !
I choiced the 12 inch sub, because I don't want any distortion, so It will be (I hope so) able to deliver the bass that I want, with low volume, so, none distortion, lower heat, lower power consuption...
As I said, I DO NOT want hard and noisy bass, I do not want sound pressure ! I want the most plain frequency response possible from 20 to 300hz
I want Sound Quality, to listen Blues, Jazz, Classical and etc.
The room isn't small, but isn't that big too...
If you think that 10 inch sub is enough, please, tell me !
I know I have many questions, but the first is: Vented or Sealed?
edit: Oh ! How could I forget?
Subwoofer specifications:
125W RMS
4 Ohms
4Kg
- Fs (free air ressonance): 26.5 Hz
- Qts ("Q" total of the sub): 0.5086
- Vas (equivalent conformity): 4.44 PC / 125.36 L
- Recommended Current Power: 40-125W
- Deslocated Volume (cubic foots PC ): 0.057 PC / 1.6 L
- Qes: 0.5281
- Qms: 13.81
- Sd: 0.0523 (m2)
- Re: 3.4 (ohm)
- Xmax: 7.50 (mm)
- Sensibility: 87 dB (1watt/1meter)
- BL: 10.88 (N/A)
- Zo (Maximium Impedance): 92.3 (ohm)
Yes those boxes are massive due to the high Qts as I said.
A Linkwitz Transform will be your friend provided you have sufficient amp power and voice coil thermal capacity. I think you might be cutting it fine. You need to do some modelling of power handling and excursion in different box sizes.
A Linkwitz Transform will be your friend provided you have sufficient amp power and voice coil thermal capacity. I think you might be cutting it fine. You need to do some modelling of power handling and excursion in different box sizes.
-_nando-_ said:IS IT 125 and 200 LITRES??
Can you sugest me a better subwoofer (for home use) and cheap ?
I'm taking a look about linkwitz transformer around the forum
Yup, 125 and 200 litres according to the specs you posted,
main cause is the 125L Vas of the driver.
Personally i'd go for two seperate subs with 300Hz c/o frequency.
Not sure what drivers are available in Brazil,
not much as far as I could tell when I was there.
If you can get them two Tangband 8" drivers would be good :
http://www.partsexpress.com/pe/showdetl.cfm?&DID=7&Partnumber=264-833
note the Vas of 18.5L.
/sreten.I need something like 40 ~ 60 litres 
I'm reading this article:
http://sound.westhost.com/linkwitz-transform.htm
Look at the attachement ! It's a 43L Sealed box, and the frequency response is okay for me...
This sub costs to me (only the sub, without box) just 180 reais, that is 74 US Dollars... Cheap don't you think?
Well, you can suggest me a better sub, but around this price too heh !
I'm reading this article:
http://sound.westhost.com/linkwitz-transform.htm
Look at the attachement ! It's a 43L Sealed box, and the frequency response is okay for me...
This sub costs to me (only the sub, without box) just 180 reais, that is 74 US Dollars... Cheap don't you think?
Well, you can suggest me a better sub, but around this price too heh !
sreten said:
Yup, 125 and 200 litres according to the specs you posted,
main cause is the 125L Vas of the driver.
http://www.partsexpress.com/pe/showdetl.cfm?&DID=7&Partnumber=264-833
note the Vas of 18.5L.
Something is wrong, I doubt that 125L of VAS is right, cannot be. Everybody uses this sub in 30 ~ 55L boxes !
And what about this one?
http://www.keybass.com.br/car_subwoofer.htm
Cheap too ! 80 us dollars for me !
Fs = 23Hz
Qms = 4,92
Qes = 0,48
Qts = 0,43
Vas = 156 (Vas = Equivalent Woofer Volume)
Xmax = 9mm
Xlim = 15mm
Sd = 580cm²
Sensibility = 88db / w / metter
I talked with the manufacturer, and he said that 60L is enough for a very smooth bass and extended, in a VENTED box. The bass will not be so clear and detailed as the sealed, but will be more smooth and extended.
Feedback ?
http://www.keybass.com.br/car_subwoofer.htm
Cheap too ! 80 us dollars for me !
Fs = 23Hz
Qms = 4,92
Qes = 0,48
Qts = 0,43
Vas = 156 (Vas = Equivalent Woofer Volume)
Xmax = 9mm
Xlim = 15mm
Sd = 580cm²
Sensibility = 88db / w / metter
I talked with the manufacturer, and he said that 60L is enough for a very smooth bass and extended, in a VENTED box. The bass will not be so clear and detailed as the sealed, but will be more smooth and extended.
Feedback ?
-_nando-_ said:
Something is wrong, I doubt that 125L of VAS is right, cannot be. Everybody uses this sub in 30 ~ 55L boxes !
More likely most people don't know what they are doing, and in a car with some bass boost it will be using a the downward slope of the curve so the response will be OK. See the EAS article on the Rod Elliot ESP website for the principle of what - in a fashion - most users are unknowingly doing.
-_nando-_ said:And what about this one?
http://www.keybass.com.br/car_subwoofer.htm
Cheap too ! 80 us dollars for me !
Fs = 23Hz
Qms = 4,92
Qes = 0,48
Qts = 0,43
Vas = 156 (Vas = Equivalent Woofer Volume)
Xmax = 9mm
Xlim = 15mm
Sd = 580cm²
Sensibility = 88db / w / metter
I talked with the manufacturer, and he said that 60L is enough for a very smooth bass and extended, in a VENTED box. The bass will not be so clear and detailed as the sealed, but will be more smooth and extended.
Feedback ?
That one will perform better in a home sub application IMO, but you can't totally go on specs alone, look at the quality of the driver and do some listening tests. The specs only tell the story at one (low level) operating point.
- Status
- This old topic is closed. If you want to reopen this topic, contact a moderator using the "Report Post" button.