New Sub XO

amplifierguru · 15th December 2005, 03:04 AM

I have just designed a crossover for subs. The PCBs have been submitted and are going through with the current lot.

The design uses a OPA4134PA quad high performance FET cascode input op amp.
It uses 2 op amps as left and right channel sallen and key 12 dB/octave high pass filters for the main speakers.

A summing MFP low pass filter sums both channels and provides a bass boost filter (optional) similar to the bass extender to control out of band cone flapping and provide bass extension allowing a smaller stronger box for the sub. The last op amp provides a 12 dB/octave band limit for the sub upper limit and can match the filter response of the mains.

So it's one 4 op-amp chip doing stereo main out 12 dB/octave
and 12 dB/octave mono sub band limited. Gain setting is possible.
Also using my same 80 dB +/- Vs discrete regulated supplies and wallwart power option or +/-18 to 25V DC.

It's about 1 week away for the finished unit.

Cheers,
Greg

amplifierguru · 15th December 2005, 03:46 AM

Here is the conceptual flow chart -

Workhorse · 15th December 2005, 04:17 AM

Hi Babe's where's the Schematic ?

sagarverma · 15th December 2005, 04:33 AM

Schema?

Workhorse · 15th December 2005, 04:39 AM

Verma Saheb.....Kareena Ko kya Karizma par ghumayoge....Yaar hamein bhi sath leh chalo......

sagarverma · 15th December 2005, 04:41 AM

Quote:

Originally posted by Workhorse
Verma Saheb.....Kareena Ko kya Karizma par ghumayoge....Yaar hamein bhi sath leh chalo......

aapka swagat hai

PAR Kareena ke baad

Workhorse · 15th December 2005, 04:48 AM

Quote:

Originally posted by sagarverma

aapka swagat hai

PAR Kareena ke baad

Chalo Aisa Karte hein ki Tum Kareena ko KariZma par le chalo, Hum piche piche Bullet Electra par Chal dete hai .....
Lets have the Fun together....

sagarverma · 15th December 2005, 04:57 AM

hi Kanwar

yeh guru vigyaapan deta rehta hai.baddi baddi batein likhta hai.iske circuit mujhe toh avg. lagte hai par woh unhe aise batata hai jaise ki no.1 hai.

Workhorse · 15th December 2005, 05:17 AM

Quote:

Originally posted by sagarverma
hi Kanwar

yeh guru vigyaapan deta rehta hai.baddi baddi batein likhta hai.iske circuit mujhe toh avg. lagte hai par woh unhe aise batata hai jaise ki no.1 hai.

Are yaar yeh jo guru hai na, yeh har waqt shuru rehta hai kuchh karne ke liye...rahi vigyappan ki baat to ise hamare TV serials "Saas bhi Kabhi Bahu thi" mein le lena chahiye bahut naam kamayega...kya kare aadat se majboor hai bechara, par hai bahut achchaa..iske ckt good hai but luck iske sath nahi hai....Shah Rukh Khan ke jaise i am the best karta rehta hai.....yahaan bahut se log crack demag ke hai bach ke rehna re baba....

amplifierguru · 15th December 2005, 05:54 AM

Hi Kanwar.

Sagarverma, that's a new look for you?

What're you saying about me? Huh?

I did the PCB from my head with some paper scribble. Haven't done a schema or sim yet. I'll do that maybe over the weekend. The functional blocks are well proven in multiway crossovers I've done before in a former life.

All on a 3" x 2" fully ground planed through hole plated board with teflon solder mask both sides and component overlay.

Cheers,
Greg

15th December 2005, 03:04 AM	#1
amplifierguru Account Disabled Join Date: Aug 2004 Location: Earth	New Sub XO I have just designed a crossover for subs. The PCBs have been submitted and are going through with the current lot. The design uses a OPA4134PA quad high performance FET cascode input op amp. It uses 2 op amps as left and right channel sallen and key 12 dB/octave high pass filters for the main speakers. A summing MFP low pass filter sums both channels and provides a bass boost filter (optional) similar to the bass extender to control out of band cone flapping and provide bass extension allowing a smaller stronger box for the sub. The last op amp provides a 12 dB/octave band limit for the sub upper limit and can match the filter response of the mains. So it's one 4 op-amp chip doing stereo main out 12 dB/octave and 12 dB/octave mono sub band limited. Gain setting is possible. Also using my same 80 dB +/- Vs discrete regulated supplies and wallwart power option or +/-18 to 25V DC. It's about 1 week away for the finished unit. Cheers, Greg

15th December 2005, 04:33 AM	#4
sagarverma diyAudio Member Join Date: Feb 2005 Location: NEW DELHI	Schema? __________________ Never Underestimate The Bandwidth of A Station Wagon Full Of Magnetic Tapes Hurtling Down The Highway...................Andrew S Tanenbaum

15th December 2005, 04:57 AM	#8
sagarverma diyAudio Member Join Date: Feb 2005 Location: NEW DELHI	hi Kanwar yeh guru vigyaapan deta rehta hai.baddi baddi batein likhta hai.iske circuit mujhe toh avg. lagte hai par woh unhe aise batata hai jaise ki no.1 hai. __________________ Never Underestimate The Bandwidth of A Station Wagon Full Of Magnetic Tapes Hurtling Down The Highway...................Andrew S Tanenbaum

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15th December 2005, 04:17 AM	#3
Workhorse diyAudio Member Join Date: Dec 2004	Hi Babe's where's the Schematic ?

15th December 2005, 04:39 AM	#5
Workhorse diyAudio Member Join Date: Dec 2004	Verma Saheb.....Kareena Ko kya Karizma par ghumayoge....Yaar hamein bhi sath leh chalo......

15th December 2005, 05:54 AM	#10
amplifierguru Account Disabled Join Date: Aug 2004 Location: Earth	Hi Kanwar. Sagarverma, that's a new look for you? What're you saying about me? Huh? I did the PCB from my head with some paper scribble. Haven't done a schema or sim yet. I'll do that maybe over the weekend. The functional blocks are well proven in multiway crossovers I've done before in a former life. All on a 3" x 2" fully ground planed through hole plated board with teflon solder mask both sides and component overlay. Cheers, Greg

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