Sean Perth Posted March 28, 2020 Share Posted March 28, 2020 I have just brought a pair of Acoustic research AR90 so my lockdown plan is to restore and stain the cabinets Link to comment Share on other sites More sharing options...
Sub Sonic Posted March 28, 2020 Author Share Posted March 28, 2020 4 minutes ago, Sean Perth said: I have just brought a pair of Acoustic research AR90 so my lockdown plan is to restore and stain the cabinets Very nice!! 1 Link to comment Share on other sites More sharing options...
Daolodish Posted March 28, 2020 Share Posted March 28, 2020 Building an RJM Audio - Emerald Dual-Mono MM/MC Phono Stage. Looks like a pretty reasonably easy build thus far, just need to find some nice enclosures that everything will fit in! Should look something like this when done, with another enclosure with the Transformer and Bridge Rectifiers. 1 Link to comment Share on other sites More sharing options...
andyr Posted March 28, 2020 Share Posted March 28, 2020 15 minutes ago, Daolodish said: Building an RJM Audio - Emerald Dual-Mono MM/MC Phono Stage. Looks like a pretty reasonably easy build thus far, just need to find some nice enclosures that everything will fit in! Should look something like this when done, with another enclosure with the Transformer and Bridge Rectifiers. Mmmm - I see the specs say "Switch between 47.5k and 100 ohm input load ". That's a shame - as, whilst 47.5K is an entirely appropriate load for MM, 100 ohms is suitable for only a small segment of MC carts. Andy Link to comment Share on other sites More sharing options...
Daolodish Posted March 28, 2020 Share Posted March 28, 2020 1 minute ago, andyr said: Mmmm - I see the specs say "Switch between 47.5k and 100 ohm input load ". That's a shame - as, whilst 47.5K is an entirely appropriate load for MM, 100 ohms is suitable for only a small segment of MC carts. Andy Luckily they provide an excellent spreadsheet with appropriate resistor values in order to set the correct loading and input sensitivities. Spreadsheet Link to comment Share on other sites More sharing options...
andyr Posted March 28, 2020 Share Posted March 28, 2020 10 minutes ago, Daolodish said: Luckily they provide an excellent spreadsheet with appropriate resistor values in order to set the correct loading and input sensitivities. Spreadsheet So you can get a much higher load impedance than 100 ohms, for a LOMC cart (using the 60dB gain setting)? Andy Link to comment Share on other sites More sharing options...
Daolodish Posted March 28, 2020 Share Posted March 28, 2020 4 minutes ago, andyr said: So you can get a much higher load impedance than 100 ohms, for a LOMC cart (using the 60dB gain setting)? Andy Correct, you just have to swap out the R2 loading resistor to the appropriate value you're chasing. Link to comment Share on other sites More sharing options...
andyr Posted March 29, 2020 Share Posted March 29, 2020 12 hours ago, Daolodish said: Correct, you just have to swap out the R2 loading resistor to the appropriate value you're chasing. Strange - looking at the 'Worksheet' in the Excel s/sheet ... it seems to talk primarily about adjusting gain?? Which LOMC cart are you going to use with the Emerald? Andy Link to comment Share on other sites More sharing options...
Daolodish Posted March 29, 2020 Share Posted March 29, 2020 I'm going to be using it with my DL103, so nothing crazy low output. Link to comment Share on other sites More sharing options...
Ittaku Posted March 29, 2020 Share Posted March 29, 2020 On 28/03/2020 at 5:57 PM, andyr said: Contact @Ittaku, Lee - he does Japanese translations, so he may know kanji. Yes I do, it's impossible to know Japanese well enough to translate it without knowing kanji. Link to comment Share on other sites More sharing options...
andyr Posted March 30, 2020 Share Posted March 30, 2020 2 hours ago, Ittaku said: Yes I do, it's impossible to know Japanese well enough to translate it without knowing kanji. I get confused between kanji and katakana, Con. Andy Link to comment Share on other sites More sharing options...
andyr Posted March 30, 2020 Share Posted March 30, 2020 19 hours ago, Daolodish said: I'm going to be using it with my DL103, so nothing crazy low output. Specs I read say coil impedance of the DL103 is 40 ohms - so I would suggest optimum loading will be anywhere between 470 ohms ... and 4700 ohms (10x - 100x coil impedance). Andy Link to comment Share on other sites More sharing options...
Ittaku Posted March 30, 2020 Share Posted March 30, 2020 4 minutes ago, andyr said: I get confused between kanji and katakana, Con. No problem. Japanese uses all 3 character sets. You can't learn Japanese without knowing all of them. Hiragana: ひらがな Katakana: カタカナ Kanji: 漢字 There are about 50 of the top two, and 6000 of the last (though only 2300 are in common use.) Kanji are basically the Japanese adopted Chinese characters almost unchanged. If anyone's looking for a lockdown project, learning Japanese will keep you going for, oh, a lifetime? Link to comment Share on other sites More sharing options...
Sub Sonic Posted March 30, 2020 Author Share Posted March 30, 2020 1 hour ago, Ittaku said: If anyone's looking for a lockdown project, learning Japanese will keep you going for, oh, a lifetime? I once complained to my Japanese teacher at school (she was actually Japanese) how hard the language was to learn. She replied “You should try learning English!” At least Japanese is more methodical and has fewer exceptions than English. Cheers, SS 2 Link to comment Share on other sites More sharing options...
oohms Posted March 30, 2020 Share Posted March 30, 2020 I'll be working on a crossover for these bad boys, and hopefully posting a build thread 9 Link to comment Share on other sites More sharing options...
AccuTidal Posted March 30, 2020 Share Posted March 30, 2020 Don’t mind I share my COVID-19 curfew project?! I did the entire listening room by using what I have currently and timber fencing from Bunnings. This was the room before.... During Constructions.... The final finish after two days.... Thanks for looking... feel free to provide your critics...! Cheers. 7 1 Link to comment Share on other sites More sharing options...
oohms Posted March 30, 2020 Share Posted March 30, 2020 25 minutes ago, Chanh said: Don’t mind I share my COVID-19 curfew project?! I did the entire listening room by using what I have currently and timber fencing from Bunnings. Thanks for looking... feel free to provide your critics...! Cheers. Looks great! What timber fencing did you go with from bunnings? Link to comment Share on other sites More sharing options...
AccuTidal Posted March 30, 2020 Share Posted March 30, 2020 25 minutes ago, oohms said: Looks great! What timber fencing did you go with from bunnings? I bought approx 10 pieces of those. 1 Link to comment Share on other sites More sharing options...
Bill125812 Posted March 30, 2020 Share Posted March 30, 2020 Looks amazing Really well done Link to comment Share on other sites More sharing options...
jgunner Posted March 30, 2020 Share Posted March 30, 2020 @Chanh looks very good. any difference in sound? Link to comment Share on other sites More sharing options...
AccuTidal Posted March 30, 2020 Share Posted March 30, 2020 20 minutes ago, jgunner said: @Chanh looks very good. any difference in sound? Absolutely! I think room treatment is often overlooked by majority. 1 Link to comment Share on other sites More sharing options...
jgunner Posted March 30, 2020 Share Posted March 30, 2020 @Chanh I couldn’t agree with you more mate. I treated my second reflection point only a few days ago and imaging+sound stage went up another level. can you describe how they have improved your existing setup? cheer Justin Link to comment Share on other sites More sharing options...
AccuTidal Posted March 30, 2020 Share Posted March 30, 2020 2 hours ago, jgunner said: @Chanh I couldn’t agree with you more mate. I treated my second reflection point only a few days ago and imaging+sound stage went up another level. can you describe how they have improved your existing setup? cheer Justin Hi Justin, what I have noticed were the larger scale of the sound stage. The resolutions was incredibly obvious, and way better focus. Most of all, both micro and macro dynamics were evidently better. when this bl@@dy COVID-19 is over, I hope to have few locals to validate my observations. My next project is to address the ceiling with timber blocks diffusers.. Cheers. 1 Link to comment Share on other sites More sharing options...
jgunner Posted March 30, 2020 Share Posted March 30, 2020 Thank you @Chanh i shall give them a try too Link to comment Share on other sites More sharing options...
wen Posted March 30, 2020 Share Posted March 30, 2020 bought speakers secondhand last year, just used scraps of timber in the garage, refurbished, up and running on sunday, incerdible midrange and detail 3 Link to comment Share on other sites More sharing options...
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