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  1. Item: John Kenny SPDIF Mk 3 USB converter Location: Goulburn NSW 2580 Price: $125 inc postage anywhere in Australia Item Condition: Good Working Condition Reason for selling: No Longer Required Payment Method: Pickup - Cash, bank Transfer. Extra Info: Unit has not been used for a while, I will also throw in the attenuator as mentioned in the glowing article. https://www.tnt-audio.com/sorgenti/jk_usb_converter_e.html Pictures:
  2. Item: 64 steps relay based ladder type attenuator, four channel, Vishay SMD resistors Location: Melbourne, Northcote Price: $360 plus postage - paid over $500 Item Condition: Brand new Reason for selling: Unused, project on hiatus. Payment Method: Pickup - Cash, Paypal, COD Only Extra Info: Unused, save to plug it into a 5V PSU and check functions. These units are a truly beautiful piece of audio craftsmanship, exquisite CNC machined and anodised housing, perfect fit and finish, silky smooth ball bearing tactile rotation. The supplied remote control has extra buttons for additional programmable functions. I can supply a 5V PSU if required. Some ideas to get you thinking - Build your own purist passive pre-amp, four channels of attenuation single ended, or stereo balanced add to output of a DSP unit to attenuate up to 4 channels without losing bit depth in the digital domain (this is what I had in mind) Add attenuation to balanced inputs of a stereo power amp Pictures:
  3. Item: A pair of Goldenjacks Ultimate RCA attenuators -20db Location: VIC - Donvale , pickup preferred Price: $33 shipped Item Condition: Like New, never used since I moved to another setup Reason for selling: No longer required Payment Method: Pickup - Cash, Paypal, Bank Transfer Extra Info: Inline passive RCA attenuators - tons of positive reviews on the net. I purchased these direct from Ian in the UK but have since moved on to another setup so these are no longer required. Best for taming hot signals and opens up the sound - more dynamics, less compression and less clutter, per users feedback. Pictures:
  4. Grabbed a second hand Sony TA-N330ES Power Amp last weekend. Lovely unit - I rather like it. Never owned Sony before, so makes a nice change. Also this is my first ever power amp. I don't have a pre-amp. I don't have a multimeter. http://www.thevintageknob.org/sony-TA-N55ES.html The TA-N55ES and TA-N330ES seem to be the same unit as far as I can tell. Mine has a switchable voltage (120, 220, 240v), and one input. It has an 'attenuator' on the front, which is a pot which works like a volume control. It has a 'notched' central point at 12 o'clock which you can feel when turning. PC -------usb------> Firestone Audio Fubar MkII DAC --------rca------> TA-N330ES -----speaker cable-------> horrible old big box freebie speakers TA-N330ES service manual states: TA-N330ES user manual states: I can't find the exact specs for the Firestone Audio Fubar MkII DAC, http://www.computeraudiophile.com/content/183-firestone-audio-fubar-ii-usb-dac-review/ but a post from the former US distributor on a blog states: It all sounds ok and works well. I use the attenuator as a volume control, set between 7 and 10 o'clock. If I set the attenuator to the centre position, it would probably blow the speakers. What's the problem? It sounds a little thin, and lacks the bass that I expected. the TA-N330ES provides less bass than the low end tripath chip amp that it directly replaced. Do I need a pre-amp? Thanks! Edit 1: I always have source PC software volume set at 100% as a general rule. With the above setup, if I reduce the software volume to about 25% it allows me to set the attenuator at 12 o'clock. The sound possibly has more depth and bottom end with these settings, and sounds closer to what I was expecting. That could be listening bias.
  5. I am currently building some 3way speakers. For xover (slope and frequency) duties I have a processor that will handle this (also does time correction too). It has 8ch outputs so has room for two subs too and a great pc interface to program it through. It runs off 12VDC so I need to make a supply for it as well. Details for processor: http://www.audison.eu/index.php?page=product&id=49 Now, to expand on the idea, I want to make a preamp to send signal to the processor. I came across the Lightspeed Attenuator mentioned in the preamp thread in 2ch area and am considering using that for my volume control, placed between the pre and pro. Where I need help is in the input switching area for the preamp. I'm loathe to use switches or relays if I can help it, unless there is a good noise free viable solution here, so was looking at a microprocessor based design. So far I have been told to look at the Picaxe range of processor chips to start with. If anyone can give me ideas on where to look for appropriate processing, circuit design, products out there or similar projects they have done, any help really, that would be greatly appreciated.
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