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justin

Manufacturer/MoT
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Everything posted by justin

  1. justin

    Stax Omega 2

    I'm getting the silver wiring from Vampire, and it's $5 a foot. I know they're just getting it from China for probably <50 cents a foot, but I can't be bothered with that. There's about 15 feet in wiring a KGSS. Then I'm just charging twice the cost of the wire for the upgrade. Considering interconnects are sold for hundreds, or even thousands, I don't think that's so bad. There are four Black Gates costing $108 a piece plus shipping. Then they have to be mounted in the box and wired instead of just soldered to the PCB. This is a really small margin on that upgrade, so small that I'd rather not even do it. It's well below what the industry standard would be for such an option.
  2. My list is too long...but here's one - Battery powered equipment has a lower noise floor
  3. I know a lot of manufacturers don't include a power cord, it actually seems like it's the norm for smaller manufacturers. I'll admit I've thought about it as well. It's not that it's a $1.50 item, but when I'm starring at the screen about to click "Checkout" for $500 worth of power cords that most people are going to throw in a drawer with the rest of their collection...that's when manufacturers decide not to include one.
  4. Here are some early RMAA test results from the current round of prototype modules. The results so far are excellent -- only 0.0014% THD with a tough 10 ohm load, the baseline for the soundcard is 0.0007% THD. This test is done in HIGH GAIN (8.5x or 18.5dB) A couple things about these results: you will see the volume level is about 0.2dB higher in one channel, that is due to normal (actually better than average) volume control mismatch. Had I done this test with a stepped attenuator it would be exactly even. The stereo crosstalk rises at high frequency, however still inaudible, this is also due to the volume control. The high frequency roll off in the graph also only exists in the test setup, it is flat to about 500KHz unless I decide to bring it down some. The noise level graph is also not very meaningful as it is limited by the sound card, and it shows only 3dB of noise is introduced over the source signal at high gain of 18.5dB. This amp passes my test of using an ultra-sensitive IEM (Shure E3) and listening for any hiss at the high gain setting. You can tell there is a difference flipping the power switch on and off but if I didn't tell you the amp was on you would say there is no noise coming through the IEMs. My goal was to have a noise floor as quiet as the Gilmore design, and that is the case. I would be very surprised if a quieter amp exists. With a AKG K701 load, much easier than a 10 ohm load, the distortion is not measurable with my test setup. There is no difference in the results between no load and an AKG K701 load. The module has also been designed to be unity gain stable. http://www.headamp.com/10_ohm_high_gain.htm 10 ohm load, high gain http://www.headamp.com/no_load_high_gain.htm no load, high gain
  5. Ken, I should be getting another round of prototypes this week. After evaluating those I will decide whether or not they are the ones that should be used for the beta.
  6. Ah, a fine tapestry of technical specifications woven together with patronizing flowery speech. Does Tyll have an evil twin?
  7. I'm working on it right now. I just received a new round of prototype boards yesterday. Could be the last one.
  8. It looks pretty well done to me. I would be very happy if I made a product like that. But I would rather take the ability to write the description as they have.
  9. I hope this is not going to be the expectation. By the time the new modules are ready, I will have put in hundreds of hours of work and a couple thousand dollars in prototyping materials. I do not expect that investment to pay off monetarily (not even close), but I prefer it to the alternative of continuing to use K. Gilmore's design or simply picking a different circuit "off the shelf" - and it would be far easier to do the latter and likely be subjected to less criticism.
  10. boodi, I will not be increasing the price of the GS-1 or GS-X, or any amp that uses the modules. I will say though that each of these modules costs at least 3x as much to build, not including any of the R&D costs which have included 4 prototype runs and a lot of work.
  11. Ben, It would depend on whether or not I still have Gilmore module boards left when the new modules are ready. I don't intend to offer both...so..."while supplies last"
  12. The amplifiers have already been built for +/- 16.4V, so the modules are designed around these voltages.
  13. Sloth, Are you planning to take this design into your Gilmore Lite (which I assume would no longer be a 'Gilmore' anything)? The Gilmore Lite will still be for sale, as is. However, when the time comes, I will design a new home amp at that price point to replace the Gilmore Lite. I don't know at this time whether that amp would be based on the new module design, or another new circuit. But it would absolutely be based on one of my own designs. What do you plan to charge for these new modules, and are they user changeable? I will likely charge something like $199 for the GS-1 and $299 for the GS-X (which requires twice as many modules), but this is not definite. They will become standard on the new amps. They can be changed easily. The module boards are socketed and also secured by 2 small phillips-head screws. Are they your personal design, or do you have a design team, or are they based on previous designs, such as your Gilmore Dynamic implimentation? This is my personal design and HeadAmp is a one-man shop. The design is based on previous experiences and knowledge, other designs through research, and what I have learned during the design process. Work on the new module design began last November.
  14. To answer Akwok's questions... What's in these modules? Any specifics? This is an all-new module designed in-house. It will be the first non-Gilmore amplification circuitry I have offered in a home amp. It is a 100% discrete design, real Class A circuit. The output consists of a pair of Hitachi MOSFETs designed for audio -- good for a substantial couple of watts in this circuit. How will it sound compared to the current Gilmore modules in the GS-1? If I had a marketing guy, he'd probably be telling me to say that there is "no comparison" between my new modules and the Gilmore circuit or to throw out some juicy words that audiophiles will eat up. I'm not going to do that. I've done plenty of comparisons between my module design and other designs to know that I have created a very solid product. Out of respect for Kevin's work, that's about as far as I will go here. The reality is, if you've ever tried an A/B switch test between two amplifiers and you couldn't tell the difference, the same will probably hold true with my new design. An exception is with the AKG K1000, where there is a very noticeable difference in the A/B test especially in bass response - the power output of the new module is definitely needed here. I am far from owning every headphone in the world, so there are likely other similar differences waiting to be heard. It's important to me to continue offering discrete designs, which I feel separate my products from most of the others on the market. It also gives me the peace of mind to know I've done all I can to create the best sounding amp within my abilities.
  15. New amplification modules from HeadAmp are coming soon. What I expect will be the final prototypes should be ready in a few weeks. At that time, I'd like to have a limited beta program to allow current GS-1 owners to try the new modules in their own system. If you own a GS-1 and are interested, post here or email me at [email protected]. I will update this post later with a detailed FAQ about the modules. Thanks, Justin
  16. Jahn, You can unbolt the transformer from the chassis and see if the noise level or frequency changes. If it does, chances are the transformer is of poor quality, or you need more padding between the transformer and chassis. It's unlikely that any power conditioning device is going to help.
  17. They have some interesting smileys over on one of the Asian boards. I wish I understood them. and probably the strangest one..
  18. The new modules are not yet complete and were in prototype form at the So-Cal Meet. I have Ed's K1000 here for some additional testing (the same K1000 in the photo). When they are complete, either the new module will be used, or both modules will be available. -Justin
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