Deleted
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Post by Deleted on Aug 14, 2010 8:37:50 GMT
Here's a simple and fun project in case you would like to try crossfeed.  It's based on a Linkwitz crossfeed. You can make Meier crossfeed on the board too. NO more PCB's left, all sold !!   Crossfeed sort-of mimics what happens when you listen to speakers.  Listening to headphones has clearly separated Left and Right channels which can be fatiguing or unnatural sounding with certain recordings. When listening to speakers you hear both speakers with each ear. The higher frequencies have shifted in phase while the lower frequencies are still in phase. Crossfeed (or X-feed) does a similar thing to the signal. Put it between a source (PC, MP3 player, DAC, CD e.t.c. and the input of your headphone amp. The headphone amp needs to have an input resistance of 10kOhm or higher (most are). You can fool around with values and topologies too. 3 different 'levels' have been calculated for you and see which you prefer. If you like less bass then omit CAP5. the capacitors and resistors are pretty standard values (resistors 0.25W to 0.5W) capacitors may be 1 or 2 mil (2.54mm or 5.08mm) and 1 cap can even go to 10.16mm. This is how you connect it between a cut RCA cable.  |
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Post by Deleted on Aug 14, 2010 9:01:39 GMT
This looks like something I could build Frans!
PM sent, thanks.
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Post by PinkFloyd on Aug 14, 2010 23:39:55 GMT
This looks like something I could build Frans! PM sent, thanks. X2! |
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wadiaman
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Measure twice.......cut once
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Post by wadiaman on Aug 15, 2010 12:04:03 GMT
I'll have a go also....sending PM......Cheers
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Post by puffin on Aug 15, 2010 12:23:10 GMT
One for me please. You have PM
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matt7941
100+
Mmmmmmm... Pork scratchings.....
Say cheese!!!!!
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Post by matt7941 on Aug 15, 2010 12:53:47 GMT
Looks great. I'd love to try one if I may. PM sent.
Cheers, Matt.
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FritzS
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Sound of Blue Danube
Sound of Blue Danube
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Post by FritzS on Aug 15, 2010 13:16:42 GMT
I want one - I sent you an email too
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Deleted
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Post by Deleted on Aug 15, 2010 13:54:53 GMT
I must try one!
PM sent, cheers.
Chris
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Post by PinkFloyd on Aug 15, 2010 21:02:59 GMT
I have plans to stick 3 of these in an enclosure with a switch providing Crossfeed "off" / Crossfeed "low" / Crossfeed "medium" / Crossfeed "high".... should be a nifty little gadget  |
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Deleted
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Post by Deleted on Aug 15, 2010 21:33:54 GMT
Yes me too Frans, P.M. sent.
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elysion
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contra torrentem
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Post by elysion on Aug 15, 2010 21:55:19 GMT
I've sent also PM.
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Post by PinkFloyd on Aug 15, 2010 22:20:32 GMT
This is a VERY good offer to Rock Grotto members..... snap these up while you can! If kits "do" become available (with full instructions / support) you are looking at a LOT more money to buy one  This is a superb introductory offer. |
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FritzS
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Sound of Blue Danube
Sound of Blue Danube
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Post by FritzS on Aug 16, 2010 2:43:04 GMT
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Deleted
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Post by Deleted on Aug 16, 2010 17:52:44 GMT
I had build some 'standard' crossfeeds before (the medium and high version) but found the effect too 'obvious' for my taste. So came up with the idea to replace the resistors with pots and twiddle around with various settings to find out what my optimal setting was.  In this picture you can see part of the schematics and the actual build.  This is the complete amp. After weeks of listening, switching, and trying different settings I came to a setting I liked on most music so I could leave it on all the time. (there is a bypass switch on the back of the amp) I measured the settings of the potmeters and the closest values to this are given as the 'subtle' settings. The effect is very subtle indeed and me likes it but since HP listening is a very personal experience I recommend fooling around with some of the resistor values. |
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Deleted
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Post by Deleted on Aug 16, 2010 21:58:18 GMT
I have plans to stick 3 of these in an enclosure with a switch providing Crossfeed "off" / Crossfeed "low" / Crossfeed "medium" / Crossfeed "high".... should be a nifty little gadget I had a similar thought! Just the subtle/medium/bypass was on my mind though. shhhpooookeh! |
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Post by PinkFloyd on Aug 16, 2010 22:03:09 GMT
I have plans to stick 3 of these in an enclosure with a switch providing Crossfeed "off" / Crossfeed "low" / Crossfeed "medium" / Crossfeed "high".... should be a nifty little gadget I had a similar thought! Just the subtle/medium/bypass was on my mind though. shhhpooookeh! I'll provide a "pictorial" on how to wire it all up to the switch when the X-Feed boards arrive from Frans |
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Deleted
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Post by Deleted on Aug 16, 2010 22:22:49 GMT
I had a similar thought! Just the subtle/medium/bypass was on my mind though. shhhpooookeh! I'll provide a "pictorial" on how to wire it all up to the switch when the X-Feed boards arrive from Frans Sounds great to me! |
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Deleted
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Post by Deleted on Aug 17, 2010 19:29:30 GMT
a small tutorial how to connect it between a cut RCA cable. I recommend building it into a small aluminium box (or other metalic box) and you must connect this housing with a short piece of wire to one of the two 'ground' pads on the PCB (the screen of the RCA cable) don't leave the housing unconnected. make sure the wire makes good contact with the housing otherwise it is likely to pick um hum or stray RF signals. |
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Post by PinkFloyd on Aug 17, 2010 21:52:18 GMT
Boards arrived today Frans, many thanks  My only minor gripe is the pitch for the film caps.... if you are to use half decent polyprop caps it's too narrow to accomodate them.... This is a minor gripe but your average "audiophool", who uses their ears as a measuring device, will insist of going down the polypropylene route |
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insomniac
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Post by insomniac on Aug 17, 2010 22:27:58 GMT
PM sent Frans
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Deleted
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Post by Deleted on Aug 18, 2010 5:34:04 GMT
@ Mike, I didn't have more room as this was the max dimension available in the larger PCB cut-out where it piggy-rided in. I originally intended it to go between the output of a HP amp and the HP itself but you will need to make many different versions depending on impedance and although it worked it doesn't do an equally good job as in line. That's why the output is a HP socket footprint and no mounting holes either as it was intended to be mounted like the HD681 filterbox. the PCB is intended so you can have a look if you like X-feed or not for a funny price and gives you something to assemble. Note: NO more boards available !  |
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wadiaman
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Measure twice.......cut once
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Post by wadiaman on Aug 18, 2010 10:46:32 GMT
Thanks Frans,your post#17 answers one query I had,the other (and this may seem stupid/obvious to you experts !!) concerns your first post with schematic and parts list.On a couple of resistor and cap. sitings you state "open",does this mean leave the part out entirely or use a link wire in its place ?
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Deleted
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Post by Deleted on Aug 18, 2010 11:17:25 GMT
yes.. open means these parts are not to be placed at all (left out entirely) so the space will remain open.
This is due to the fact that the board is 'universal' so other topologies can be made on the same board but it is not needed for all the parts on the board to be placed in all applications.
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Deleted
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Post by Deleted on Aug 19, 2010 11:42:19 GMT
Frans, My boards are here too, many thanks. You finished yet Mike! ;D  |
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Post by puffin on Aug 19, 2010 18:42:57 GMT
I got my board today.
Thanks
Rob.
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This is a superb introductory offer.
My only minor gripe is the pitch for the film caps.... if you are to use half decent polyprop caps it's too narrow to accomodate them.... This is a minor gripe but your average "audiophool", who uses their ears as a measuring device, will insist of going down the polypropylene route 
