I have recently design 3 way sytem with subwoofer. 120 RMS woofers 8OHM 88 db, Mid range Full range speaker 40W 8Ohm 88Db, Tweeter 8Ohm 40W unknown DB. 12DB 3 way crossover. I noticed some High freequency spikes it was adjusted electronically in the pre amp section. My Woofer 61Hz resonance and box ported type designed for 40 Hz. Subwoofer Infinity 121W in a closed box driven by 400 W class D amp also have active crossover in the pre amp section. It is not a fully functional crossover but we can adjust using presets arrangement. Bellow 60 Hz I noticed a dip bellow 60 Hz and that graph fatensout till 35 -40 Hz then falls sharply bellow 40 Hz. I don't have a calibrated mic but mobile phone mic and Android app for freequency measurements. I do confirm my graph accuracy using a branded polk audio system. Because I have limited resources. System perfomace very nice I am following your channel so I am able to design a music system with satisfying out put. I tuned the sub to perform bellow the 60Hz. So the overall trend become flat from 40 Hz. Entire system including Power amp cost Rs. 20000 Indian rupees. Amplifier front panels I designed myself and laser cut on acrylic sheet. Left and right 100W Toshiba 5200 transistor AB type with 10 Band equaliser pre amp (Built in). 400W class D for sub channel. Speaker protection (DC protection, start-up delay) using relay switches were installed. 27-0-27 8Amp EI core transfotmer I wind by hand. It works well for me. There was a slight humming sound in the background. It was due to the cooling fan. So i connected it through a seperate 12Volt smps hence problem rectified.
Thank you another great video and for testing stuff that is available on EU markets. I have a question. You test for resistance, conductivity and discard ones made of steel etc. but in the end you use ferrule? What ferrules are made of and what about their impact on connectivity? Also are these confirmed to prevent oxidation over time? I know that some people instead of ferrule would use silver solder to "bond" and protect strands from oxidation before inserting htem into banana plugs. I would imagine that it would have better effect than a ferrule? Could you please let us know what are your thought on the subject? EDIT: Ok I did some reading and apparently ferrules are meant to prevent oxidation :). Also these can be made from copper or brass and coated with tin or whatever else :) - do you know of any good source of copper coated with something good? :) Or can you list a link to the ones you are using if you know what these are made of? There is no link in your parts list. Thanks again.
Check out the newest Video from "Franks Werkstatt der Lautsprechertechnik", where he introduces a great idea for a cheap but very good solution for a DIY binding post. The language should not be a problem, the whole thing is step by step visualized.
FInally new video man!
I have recently design 3 way sytem with subwoofer. 120 RMS woofers 8OHM 88 db, Mid range Full range speaker 40W 8Ohm 88Db, Tweeter 8Ohm 40W unknown DB.
12DB 3 way crossover. I noticed some High freequency spikes it was adjusted electronically in the pre amp section.
My Woofer 61Hz resonance and box ported type designed for 40 Hz.
Subwoofer Infinity 121W in a closed box driven by 400 W class D amp also have active crossover in the pre amp section. It is not a fully functional crossover but we can adjust using presets arrangement.
Bellow 60 Hz I noticed a dip bellow 60 Hz and that graph fatensout till 35 -40 Hz then falls sharply bellow 40 Hz.
I don't have a calibrated mic but mobile phone mic and Android app for freequency measurements. I do confirm my graph accuracy using a branded polk audio system. Because I have limited resources.
System perfomace very nice I am following your channel so I am able to design a music system with satisfying out put.
I tuned the sub to perform bellow the 60Hz. So the overall trend become flat from 40 Hz.
Entire system including Power amp cost Rs. 20000 Indian rupees.
Amplifier front panels I designed myself and laser cut on acrylic sheet.
Left and right 100W Toshiba 5200 transistor AB type with 10 Band equaliser pre amp (Built in).
400W class D for sub channel.
Speaker protection (DC protection, start-up delay) using relay switches were installed.
27-0-27 8Amp EI core transfotmer I wind by hand. It works well for me. There was a slight humming sound in the background.
It was due to the cooling fan. So i connected it through a seperate 12Volt smps hence problem rectified.
Thank you another great video and for testing stuff that is available on EU markets.
I have a question. You test for resistance, conductivity and discard ones made of steel etc. but in the end you use ferrule? What ferrules are made of and what about their impact on connectivity? Also are these confirmed to prevent oxidation over time?
I know that some people instead of ferrule would use silver solder to "bond" and protect strands from oxidation before inserting htem into banana plugs. I would imagine that it would have better effect than a ferrule?
Could you please let us know what are your thought on the subject?
EDIT: Ok I did some reading and apparently ferrules are meant to prevent oxidation :). Also these can be made from copper or brass and coated with tin or whatever else :) - do you know of any good source of copper coated with something good? :)
Or can you list a link to the ones you are using if you know what these are made of? There is no link in your parts list. Thanks again.
Check out the newest Video from "Franks Werkstatt der Lautsprechertechnik", where he introduces a great idea for a cheap but very good solution for a DIY binding post. The language should not be a problem, the whole thing is step by step visualized.