ben_r_
500+ Head-Fier
Added a new pic showing the HE-500's on the Woo Audio single headphone stand all on top of the blacked out and modded Emotiva mini-X a-100.
Thanks guys.
Also, if there is anything else youd like me to talk about that I might have missed or other pictures youd like to see let me know here and Ill see what I can do. I will be getting up a pic of the amp powered on as well as one with my new Woo Audio headphone stand thats coming holding the HE-500's but anymore pic of the inside and I probably wont be able to do as I dont want to open this amp up anymore unless I absolutely have to.
ben_r: A Fantastic job, which has left me in awe and gotten me intimidated at the same time. Now (since any process involving drilling a chassis or messing with the insides of an amp scares the bejeezus out of me), if I were to opt for the adapter option, can I add the attenuation by simply installing standard attenuators at the input points on the mini-x (DC-1 out ===>> Mini-x inputs)? Also is the adapter in the pic available for sale, or did you make that yourself? I have posted a similar question to you on the Emotivalounge, so excuse the repetition. It is just that my Hifiman He-500 will be delivered any day from now, and I would like to have the amp ready to do it justice.
Thanks...
You could definitely put the attenuation resistors inline with the adapter cable I pictured and avoid messing with the amp itself entirely. I built the one shown in the review though I have seen others on eBay while not as nice looking still offer the same function. One with attenuation resistors in line would more than likely have to be a custom job that someone would have to build for you or you build it yourself.
I have attempted to use a Sherbourn LDS 2 150 (https://www.audiogeneral.com/sherbourn/lds2_75_brochure.pdf), which I have purchased brand new, as a headphone amp, but the results are mixed: The amp outputs sounds normally through line output into my He-500s, but that sound is understandably anemic (as line outputs sound are typically supposed to be, if I have understood my readings correctly). I have been trying to use the speaker outputs on the amp for my headphones using the "Art HeadTAP" ("ArtCessories Headphone tap [http://www.sweetwater.com/store/media/ARTcs_Specs0303_HeadTAP.pdf]), but I am not able to get any sound to my headphones this way, for some reason that I cannot fathom.
The speaker outputs on the LDS 2150 accept only bare wire connections (instead of banana plugs, as the mini-x does), so in order to connect it to the Art HeadTAP, I use 20 awg speaker wires that are connected to two 1/4 pins (for L & R channels), which I then connect to the Art HeadTAP via a Radioshack Y-Adaptor (http://www.ebay.com/itm/like/261437616347?lpid=82)..
When I power on the amplifier with the speaker output connections configured this way, the LDS (Load Detection system) LED flashes orange in order to indicate either that there is a problem with the speaker connections, or with the "impedance of the connected speakers" (but there are of course no connected speakers: there is the Art Headtap, and if everything is working correctly, my headphones).
Again, my headphones works well with the amp in conjunction with the the Art Headtap, when connected to the Line outputs on the amp. The problem I have outlined above occurs only when I am attempting to use the speaker outputs on the amp. I have spoken to customer support at both Emotiva and Art Headtap, and they both seem to think there is no reason why the speaker outs on the amp should not work well with the Art HeadTAP as desired, so I must be doing something the wrong way. If you have any suggestions or questions, kindly let me know.
I'm guessing there is a short between a + channel and ground somewhere in your wiring bundle. I don't think it's a lack of load. If you have a multimeter connect a set of headphones and check the resistance between L+ and ground and R+ and ground on the speaker end of your interface cables. One or both probably read 0 ohms.
Excellent work Ben R. I went ahead and did the mod pretty much identical to how you did with the same caps and all. Trouble is, I increased the noise floor to high for my liking as compared to just using the speaker taps. I started with just twisted copper braiding, and then re-routing the wiring. That didn't work.
Next I ordered a piece of Mogami shielded quad cable and that didn't solve it. Just too much noise entering the lines. So, I have a great looking jack on the front but the cable is disconnected internally.
The external taps with banana plugs does work just fine. I've been specifically using HE-500, K712 Pro, and my new Beyer T1 with the MiniX.......such an impressive pairing with all of them.
Quite a stellar amp easily besting my other fleet of amps. Thanks for the great post!
Wow that sucks. I have zero noise on mine through the headphone output until the volume is dang near all the way up. Sorry that didnt work out for you. You did use the resistors for attenuation right?
I'm guessing there is a short between a + channel and ground somewhere in your wiring bundle. I don't think it's a lack of load. If you have a multimeter connect a set of headphones and check the resistance between L+ and ground and R+ and ground on the speaker end of your interface cables. One or both probably read 0 ohms.
I just got a mini-X that I am using for speakers. Is there a way to do this mod so that when the headphones are not plugged in the audio will be routed to my speakers and once headphones are plugged in the audio will be routed to the headphones only?
Or this this mod only really valid if you are using the mini-X for headphones only?