November 4, 200718 yr comment_62142 Heh...I JUST found this place. I had a uestion about the predator, and there hasn't been an answer. I'm thinking it won't be answered because my suspicions are right. That and any negativity (even if contructive) towards RSA is frowned upon over there. Apparently not so much here, so I'll ask here, lol. Here's the post I made, and it hasn't gotten a response yet: -------------------------------- I have a question about the gain. You say the gain is set at 11 in high. An iPods line out is 1vRMS, which is 2.8vpp full scale(volts peak to peak, according to Vinnie on various threads). Wouldn't you need ATLEAST 32 volts to have a gain of 11 on an iPod so you don't have some serious clipping or distortion when the volume is cranked really high? ESPECIALLY on high load cans like 600 ohm DT880s? Gain was something I was mulling over when I was looking at some DIY designs to power 250ohm Darths, and there was a design that utilized a gain of 11, but it had a powercord/dedicated PSU. When I saw gain of 11, I thought "Predator" and then thought I'de ask if this is the case with the Predator, since I can't see 34+ volts coming out of that LiOn battery. Can you shed some light? This is partly the reason I'm not in bed yet, lol. -------------------------------- Is this the case or am I missing something? Report
November 4, 200718 yr comment_62144 Welcome to Head-Case, sorry about your thin skin! And to your question - I have absolutely no fucking idea. Report
November 4, 200718 yr Author comment_62146 Hah...I have no thin skin...infact, last night I just read the reasoning behind how this place came about...pretty funny, lol. I guess not everybody can let things roll off thier backs, or have an unbiased opinion without getting the "smackdown" from mods who protect certain vendors... Meh, I was curious, it was an amp I was CONSIDERING, but after researching a bit, not so much. Report
November 4, 200718 yr comment_62150 Ah crap, you are that super annoying mother. Well, you might want to do a lot of reading around here before you start the shittalk. Report
November 4, 200718 yr comment_62152 jesus christ, you guys have been giving newbs a baptism by fire lately. I'm glad I somehow fall through the cracks wherever I go. Report
November 4, 200718 yr Author comment_62158 Ah crap, you are that super annoying mother. Well, you might want to do a lot of reading around here before you start the shittalk. WTF? Report
November 4, 200718 yr comment_62169 you're that dude that called trose's rig "serious"... ??? ??? Report
November 4, 200718 yr Author comment_62176 Meaning that's a serious amount of money spent...I guess it's all in context.... I said the same thing about this guys rig: http://www.head-fi.org/forums/showthread.php?t=246541 more specifically, the link in that thread pointing to here: http://66.48.80.139/~idemonor/ws/newrig.html Same saying...different context I guess...meh... Report
November 4, 200718 yr comment_62177 Meaning that's a serious amount of money spent...I guess it's all in context.... I said the same thing about this guys rig: http://www.head-fi.org/forums/showthread.php?t=246541 more specifically, the link in that thread pointing to here: http://66.48.80.139/~idemonor/ws/newrig.html Same saying...different context I guess...meh... You DEF are a noob, as many of the guys here have more moeny invested in just their sources. Report
November 4, 200718 yr comment_62181 Is this the case or am I missing something? Yep, you'll need 32V or so to run the amp at full volume with a gain of 11 from the iPod line out. Whether you'll ever crank it up that much is a whole other question... Report
November 4, 200718 yr Author comment_62183 You DEF are a noob, as many of the guys here have more moeny invested in just their sources. I can head over to Audiokarma and tell you that, I'm just saying as far as having two seperate rooms and TWO high end tables, amps, phono's etc, that's pretty fucking elaborate for TWO rooms...meh... Report
November 4, 200718 yr comment_62185 You DEF are a noob, as many of the guys here have more moeny invested in just their sources. If you're referring to Trose, no doubt. But that Tmij dude has some seriously good stuff. Report
November 4, 200718 yr comment_62186 2.828vpp is a 1vRMS sine wave. Peak amplitude may differ in actual music but suffice it to say at what is likely 3.7v supply, factoring in headroom, much above unity gain won't be particularly useful. On a smaller amplitude output, such as a PCM2704 (1.8vpp), gain can perhaps be a bit higher but unlikely even 2 when factoring in how close the amp will realistically approach its rails. Probably more than anything, the use of such high gain just raised the noise floor and distortion. Report
November 4, 200718 yr comment_62199 2.828vpp is a 1vRMS sine wave. Peak amplitude may differ in actual music but suffice it to say at what is likely 3.7v supply, factoring in headroom, much above unity gain won't be particularly useful. On a smaller amplitude output, such as a PCM2704 (1.8vpp), gain can perhaps be a bit higher but unlikely even 2 when factoring in how close the amp will realistically approach its rails. Probably more than anything, the use of such high gain just raised the noise floor and distortion. Filburt and everyone else is absolutely correct. The only reason that the gain of 11 option is available is that it is a copyover from the hornet design. That high gain is designed for sources that have an output voltage of only 100mv or so. This is clearly stupid as the internal dac has an output of way more than that. Given the 4.0 volts (absolutely fully charged and even overcharged a bit) and a rail to rail opamp that looses .4 volts, the absolute maximum output voltage is going to be 3.6 VAC Peak to Peak. Report
November 4, 200718 yr Author comment_62205 Filburt and everyone else is absolutely correct. The only reason that the gain of 11 option is available is that it is a copyover from the hornet design. That high gain is designed for sources that have an output voltage of only 100mv or so. This is clearly stupid as the internal dac has an output of way more than that. Given the 4.0 volts (absolutely fully charged and even overcharged a bit) and a rail to rail opamp that looses .4 volts, the absolute maximum output voltage is going to be 3.6 VAC Peak to Peak. So why the hell would you put a gain that high? Bragging rights? Nobody is going to brag about a distorted signal. Given the lineararity of his pot, you couldn't turn it over 50% as it's approaching clipping voltages. Is he just hoping nobody uses high resistance cans at high levels or is powering small speakers(some people actually do that, lol)? Also, given the battery life he claims, with it running on high gain, wouldn't the battery life drop CONSIDERABLY when the volume is at anything past 20%? Why would you shoot yourself in the foot like that? The more and more I look at it, the more it seems like a hokey design.... Report
November 4, 200718 yr comment_62206 So why the hell would you put a gain that high? Bragging rights? Nobody is going to brag about a distorted signal. Given the lineararity of his pot, you couldn't turn it over 50% as it's approaching clipping voltages. Is he just hoping nobody uses high resistance cans at high levels or is powering small speakers(some people actually do that, lol)? Also, given the battery life he claims, with it running on high gain, wouldn't the battery life drop CONSIDERABLY when the volume is at anything past 20%? Why would you shoot yourself in the foot like that? The more and more I look at it, the more it seems like a hokey design.... Most people planning to buy the Predator are also K1000 owners Report
November 4, 200718 yr comment_62208 I plan to use my K1k (assuming I don't sell them) with my Pico, so it's not that far off Report
November 4, 200718 yr comment_62210 I plan to use my K1k (assuming I don't sell them) with my Pico, so it's not that far off Paging Boomana.... Report
November 4, 200718 yr comment_62211 I've used my mini cubed with K1ks so.... And yes it was just for kicks..... Report
November 4, 200718 yr comment_62213 i love how once everyone comes here, their opinion on RSA changes Report
November 4, 200718 yr comment_62215 Assumnig you're not just saying that in jest, a lot of it is that on Head Fi, if anything against Ray is said, people are on it like crocodiles, and I for one, don't want to deal with that. On here it's easier to hold a contrarian opinion. Report
November 4, 200718 yr comment_62216 Yup, same here. I don't really read the amp forum unless there is a thread that looks interesting. Report
November 5, 200718 yr comment_62227 DEM PREDATOR HAV THE GAIN FOR THE VERY LOUD IN THE PONES BE LIKE "WHUUT" WIN U ROLLIN Report
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