Farpun Posted December 21, 2018 Posted December 21, 2018 Hi all, Just looking at amps for my Sennheiser HD650 and am looking at the Massdrop X THX AAA 789 Linear Amplifier. It puts out 800mW into 300ohms, I read the Sennheiser has an recommend maximum input of 500mW.Would 800mW be bad for the HD650? Or would it be a good match? Thanks for reading this post.
sakabatou Posted December 21, 2018 Posted December 21, 2018 It should be fine, as long as you don’t turn the volume up too high. In my experience (HD 600, with amp that puts out over 1w) you’ll blow your ears off long before that 1
alphanumerix1 Posted January 25, 2019 Posted January 25, 2019 completely fine, i use my hd600 with a nfb1amp rated at 1.2w at 300ohm. 1
dalethorn Posted January 25, 2019 Posted January 25, 2019 Look at the impedance curve on the Innerfidelity site. That big spike in the bass will suck a lot of extra power and could make the bass flabby under some conditions. But it might not be a problem with this amp - just something to consider. 1
Farpun Posted January 25, 2019 Author Posted January 25, 2019 I am also looking at the Atom amp by JDS Labs, they claim 125mW at 600ohm and 502 at 150, not sure what it would rate at 300ohms.Any opinions on this setup?I was looking at an nwavguy blog that states "the Sennheiser HD600 is 97 dB/mW so it requires 20 mW to hit peaks of 110 dB". That gave me the impression HD650s might need less power than I originally thought.http://nwavguy.blogspot.com/2011/09/more-power.html?m=1
betty boop Posted January 25, 2019 Posted January 25, 2019 I found musical fidelity xcan v3 a great match if can track down one 1
a_zee Posted January 26, 2019 Posted January 26, 2019 Just re. the calculations, trying to understand something here: If my amp spec sheet says headphone out is 25 mW / 8 Ω , and my headphone is 600 Ω, does that mean my amp output is 600/8 * 25 = 1.875W when powering the 600 Ω cans?
Farpun Posted January 26, 2019 Author Posted January 26, 2019 If you're using the nwavguy sheet you want to aim for 110 decibels at the sensitivity of your headphones, that will show you how many mW you need to get there, and then you need to look for an amp that puts out that power at 600ohms.I know that doesn't really answer your question haha sorryI get confused aswell because when I try to find the mW that the Atom amp puts out at 300ohm if I divide 125mW at 600ohm in half I get 62.5 at 300ohm but if I do 502 at 150ohm and times that by two I get 1,004 at 300ohm, so if someone more mathematically inclined could step in would be great haha Just re. the calculations, trying to understand something here: If my amp spec sheet says headphone out is 25 mW / 8 Ω , and my headphone is 600 Ω, does that mean my amp output is 600/8 * 25 = 1.875W when powering the 600 Ω cans?
Tarzan Posted January 26, 2019 Posted January 26, 2019 It will be epic. It has the most grunt per buck spent and delivers it clean from all accounts. I was looking at this amp but really don't need it for my HD660s in a balanced set up. For example, if you have 100 watt speakers, give them 200 watts. They will sound great and love you. If you gave them 50 watts, they will **** themselves in no time and hate you for their short lived lives. As the old (like me) saying goes, more power=more fun RELIABLY. If your thinking WTF research "clipping", this is what kills drivers and ears. 1
dalethorn Posted January 26, 2019 Posted January 26, 2019 15 hours ago, Farpun said: I am also looking at the Atom amp by JDS Labs, they claim 125mW at 600ohm and 502 at 150, not sure what it would rate at 300ohms. Any opinions on this setup? I was looking at an nwavguy blog that states "the Sennheiser HD600 is 97 dB/mW so it requires 20 mW to hit peaks of 110 dB". That gave me the impression HD650s might need less power than I originally thought. http://nwavguy.blogspot.com/2011/09/more-power.html?m=1 The only caveat I would add to this discussion is that all of those specifications of how many DB you get per MW are based on a frequency of 1000 hz. When you get into the bass, and especially when your impedance spikes in the bass, you need a lot more power. If you read user reviews of an amp and those reviews address that issue, it might help. The thing is, sometimes the lack of power at the deepest frequencies is easy to miss if the amp does a "soft clipping" instead of making a distorted sound.. 1
feanorean Posted June 3, 2019 Posted June 3, 2019 On 22/12/2018 at 3:41 AM, Farpun said: Hi all, Just looking at amps for my Sennheiser HD650 and am looking at the Massdrop X THX AAA 789 Linear Amplifier. It puts out 800mW into 300ohms, I read the Sennheiser has an recommend maximum input of 500mW. Would 800mW be bad for the HD650? Or would it be a good match? Thanks for reading this post. THX AAA 789 will be sweet with the HD650. If you can get one :-) 1
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