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Post by Guitar on Dec 22, 2020 6:29:59 GMT -6
I'm not sure if I understand this correctly. I thought a 300 ohm headphone would be the heavier load than the 62 ohm headphone. The HD650 which are the 300 ohm headphones are the ones that don't perform as well to me. Maybe there's some misunderstanding here. I have always thought that a higher load impedance was a "heavier" load. For example a guitar speaker with a solid state amp, the 16 ohm speaker might be quieter than the 4 ohm speaker with the same amp. I went through this before on gearslutz and people were educating me but I'm not sure if I fully grasp headphone loading. The wolfbox is the "Motown DI." Originally built with a Triad A-11J or A-12J transformer, although there is some debate about that. I use A-55J and A-65J which sound good to me and are less depleted on the market. Ed Wolfrum was the designer and James Jamerson would have carried one around and nicknamed it the "Wolfie box" shortened to Wolfbox in modern language. I love that sound. No, the lower the number, the heavier the load. 4 ohms is harder to drive than 16 since it's closer to a short, etc. A 300 ohm headphone should be much easier to drive than a 62ohm headphone. I was reading that a higher impedance headphone will require a higher voltage swing from the headphone amp, which some may not be able to deliver. Saw some formula quoted that looks a little like ohms law P = I^2 * R, and another one P = V^2 * R Some people were saying a lower impedance headphone will pull more current from the amp. This stuff I don't have fully clear in my mind, and maybe it's complex, I don't know. Apologies for any half formed notions here. And then the general idea in common language people saying HD650 are "hard to drive" and so on. And I guess the sensitivity of the driver matters too. For example my AKG K702 are quieter than my ATH-M50 even though they are around the same impedance.
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Post by svart on Dec 22, 2020 8:28:24 GMT -6
No, the lower the number, the heavier the load. 4 ohms is harder to drive than 16 since it's closer to a short, etc. A 300 ohm headphone should be much easier to drive than a 62ohm headphone. I was reading that a higher impedance headphone will require a higher voltage swing from the headphone amp, which some may not be able to deliver. Saw some formula quoted that looks a little like ohms law P = I^2 * R, and another one P = V^2 * R Some people were saying a lower impedance headphone will pull more current from the amp. This stuff I don't have fully clear in my mind, and maybe it's complex, I don't know. Apologies for any half formed notions here. And then the general idea in common language people saying HD650 are "hard to drive" and so on. And I guess the sensitivity of the driver matters too. For example my AKG K702 are quieter than my ATH-M50 even though they are around the same impedance. Not going to try to decipher stuff that's on the internet, it's too jumbled. Lower impedance draws more current. Headphone amplifiers are usually class A/B or B current sources but with fixed voltage rails. The higher impedance cans are easier to drive, but can't generate the same power with the fixed voltage rails. Remember, the "force" that pushes current is voltage. So V is constant in our system. P=V²/R. Let's say it's 10v rail to rail, 10²=100. 100/62=1.6W 100/300=0.33W 300 ohm cans will be a lot quieter for the given voltage rails. However, if we double the voltage.. 20²=400 400/300=1.3W So yes, you need higher voltage to get to the same power, but the discrepancy is that the current is what drives the coils. You will have no loss in fidelity as it's the same amount of current, you'll just have a loss in volume. And as we all know, people perceive louder as sounding better.
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Post by Guitar on Dec 22, 2020 9:30:31 GMT -6
svart Thank you for slicing through the gibberish and getting right to the point. Your knowledge of electronics is something I admire. I suppose I just didn't like the "quality" of the HD650 with the SSL2+ phone amp, and it is also not loud enough to track with, at least how I like to track. Do you have any insight into "sound quality" with headphone amplifiers not related to output volume in any way? Is it just simply "do I like it or not?" like with a lot of audio gear, or is there some measurable quality that makes some headphone amps sound better? I remember some people that claiming a "near zero ohm" headphone amp output impedance was desirable, for example. And we all like having extra headroom (highest volume) on tap.
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Post by ChaseUTB on Dec 22, 2020 23:23:08 GMT -6
More current to drive higher impedance loads. Less resistance/ impedance less current to drive the load. A speakers impedance changes as soon as it moves. I assume headphones are the same since they are amplified transducers but not 100% sure.
Monkey was referring to ohms law -> voltage = current x resistance
I used this for car audio amps before using an Oscope E = √(PR) Voltage equals the square root of Power x Resistance Ex 1 : E {voltage} = sq root of ( 3000 W x 1 ohm ) = sq root ( 3000 ) = 54.77 V AC. So 54.77 V Ac = the square root of 3000 W x 1 ohm
Ex 3: E { voltage }= sq root of ( 500 W x 8 ohms ) = sq rt of 4000 = 63.25 V
In this ex it takes 54.77 V for this amp to produce 3000 Watts @ 1 ohm impedance & 63.25 V to produce 500 Watts @ 8ohms impedance.
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Post by grproductions on Jan 30, 2021 20:38:45 GMT -6
"improve" how? More power doesn't mean higher performance. It works as designed. The German reviewer complained about lack of power which results in subpar fast transient response. But the solution is not "replace some components to put more power through it" I suppose? Or is it? Hi, im new here, i found this thread after searching more on this question about a faulty IC replacement. www.gearslutz.com/board/product-alerts-older-than-2-months/1294438-solid-state-logic-launches-ssl-2-ssl-2-audio-interfaces-32.htmlthese ppl where also discussing the ifixit tear down and SSL denied this when i asked them as i have both the 2 and 2+ For the record here all i can confirm is that the units where not built well for portability as you all found out the units require powered usb hubs, i can confirm that they do work stand alone. SSL aka Peter Gabriel where clever to launch a SSL4000 type i/o with decent introductory prices, if you check that link out they are talking about the next gen SSL2 9K which is based on the SSL9000 Boards that had the first decent SSL mic pres...not the 4k everyone upgraded from including Peter Gabriel himself who now owns more of SSL company shares. im almost ready to return mine to Amazon if SSL refuses to explain why they did not use the sane pres like on the 6 model.
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