Help with PLLXO for F.A.S.T, CHR-70+DA175-8 - diyAudio
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Old 19th October 2012, 09:39 PM   #1
Tachyon is offline Tachyon  Sweden
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Join Date: Feb 2005
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Default Help with PLLXO for F.A.S.T, CHR-70+DA175-8

Need some help please as I lack any knowledge of passive line-level crossover design. Had a look at:
TLS.org | Passive Line-Level Crossover
but it's way over my head, maybe to many years since I was in school

Mid/High driver is Mark Audio CHR-70, mounted in a 1lit plastic sphere, trawl float.
Low freq will be covered with Dayton DA175-8 in a 16lit sealed PVC pipe.

Crossover freq 300Hz but other ideas are welcome. First order 6 dB.

Amp for DA175-8 is Hifimediy T1, Input impedance: 50K
Amp for CHR-70 is Hifimediy T1-M, Input impedance: 50K

Source is my laptop to a HifiMeDiy Sabre USB DAC. 96khz/24bit

The system is for my camper/RV.

Pictures will be posted soon as I progress with the construction.
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Old 22nd October 2012, 09:43 AM   #2
Tachyon is offline Tachyon  Sweden
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Problem solved.
It seems to be more attractive for members to discuss their view in the thread on passive vs. active filters than to help out with the construction of an actual filter.
85 members have had a look on this topic but left no reply.
This time google was more of an help than here.
Have fun!
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Old 22nd October 2012, 09:53 AM   #3
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Quote:
Originally Posted by Tachyon View Post
Problem solved.
It seems to be more attractive for members to discuss their view in the thread on passive vs. active filters than to help out with the construction of an actual filter.
85 members have had a look on this topic but left no reply.
This time google was more of an help than here.
Have fun!
Hi Tachyon,

You need a measurement mike (~50 or 600 SEK), a soundcard with phantom power for the mike and start by doing measurements. Use ARTA or some other software suite and get familiar with it.
The PLLXO math is pretty straight forward but there is a spreadsheet out there you can download. I made one for myself way back that I can send you.
The PLLXO must be driven from a preamp with low output impedance and a healthy output voltage since there is going to be insertion loss in the filter.

best
Kris
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Old 22nd October 2012, 11:05 AM   #4
Tachyon is offline Tachyon  Sweden
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Join Date: Feb 2005
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Hi Kris,
found the spreadsheet and figured out the values, thanks.

My initial plan is not to use a preamp as this is a mobile setup
Laptop -> USB DAC -> PLLXO -> Class D Amps -> drivers

This is the only specs I have found so far for the DAC, has it enough juice for the PLLXO?

Output power on different loads:

Open 2.2Vrms
4.7k 2.1Vrms
1.8k - 1.9Vrms
510R 1.5Vrms
330R 1.3Vrms
30R 1Vrms

Regards
Ralph
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Old 22nd October 2012, 12:30 PM   #5
Tachyon is offline Tachyon  Sweden
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Join Date: Feb 2005
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Progress so far, ready to be painted.
Routed a ring from plywood for mounting the driver.
Tangit glue and primer.

Click the image to open in full size.

Click the image to open in full size.
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Old 22nd October 2012, 12:37 PM   #6
Einric is offline Einric  United States
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Location: Bozeman, MT
I am very interested in this project, I am looking to pair the A6p with DA175.
I look forward to seeing your results.
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