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FitEar TO GO! & Universal Series --- Suyama's custom IEM, made universal!
Dec 23, 2012 at 2:17 PM Post #1,743 of 4,896
Quote:
tomscy2000 said:
 
Should be between 43-45 ohms
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Thank you Tom 
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.......would you know why would the 334 is 2.5 times more than UM Miracles?
Just trying to learn. The spec of IMPEDANCE has suddenly hit me hard as needing to be taken into consideration when making purchasing decisions about gear.
 
Dec 23, 2012 at 2:27 PM Post #1,744 of 4,896
Quote:
saraguie said:
.......would you know why would the 334 is 2.5 times more than UM Miracles?
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Impedance is measured at 1 kHz for most purposes, but it's actually not that important with BA IEMs, you need to look at the entire impedance curve. Traditionally, it was okay to just look at impedance at a single point because dynamic coil driver impedances are usually flat with respect to frequency, but not so with BAs. Because of the crossover circuit implemented and the choice of drivers, the 334 rises to 50-60 ohms in the midrange, but is as low as 15 ohms in the bass and treble. I have no idea what the Miracle's impedance curve looks like. Usually, as a rule of thumb, if you're looking for good damping factor when pairing amps with BA IEMs, choose the amp with the lowest possible output Z; multiple BA IEMs usually can't be counted on to have anything higher than 10 ohms at their lowest point in the impedance curve. Don't have time to explain more. Hope this helps.
 
Dec 23, 2012 at 2:29 PM Post #1,745 of 4,896
Quote:
tomscy2000 said:
 
Impedance is measured at 1 kHz for most purposes, but it's actually not that important with BA IEMs, you need to look at the entire impedance curve. Traditionally, it was okay to just look at impedance at a single point because dynamic coil driver impedances are usually flat with respect to frequency, but not so with BAs. Because of the crossover circuit implemented and the choice of drivers, the 334 rises to 50-60 ohms in the midrange, but is as low as 15 ohms in the bass and treble. I have no idea what the Miracle's impedance curve looks like. Usually, as a rule of thumb, if you're looking for good damping factor when pairing amps with BA IEMs, choose the amp with the lowest possible output Z; multiple BA IEMs usually can't be counted on to have anything higher than 10 ohms at their lowest point in the impedance curve. Don't have time to explain more. Hope this helps.
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It does plenty......appreciate it!
 
Dec 23, 2012 at 8:40 PM Post #1,746 of 4,896
tomscy2000 said:
 
Impedance is measured at 1 kHz for most purposes, but it's actually not that important with BA IEMs, you need to look at the entire impedance curve. Traditionally, it was okay to just look at impedance at a single point because dynamic coil driver impedances are usually flat with respect to frequency, but not so with BAs. Because of the crossover circuit implemented and the choice of drivers, the 334 rises to 50-60 ohms in the midrange, but is as low as 15 ohms in the bass and treble. I have no idea what the Miracle's impedance curve looks like. Usually, as a rule of thumb, if you're looking for good damping factor when pairing amps with BA IEMs, choose the amp with the lowest possible output Z; multiple BA IEMs usually can't be counted on to have anything higher than 10 ohms at their lowest point in the impedance curve. Don't have time to explain more. Hope this helps.
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XO is one thing, the main problem here is BA drivers are very inductive, hence their unpredictable Z curve (it's not totally a hit-or-miss though, most BA's Z curves have few large peaks in the middle and a big jump towards the end). I might measure the Miracle's Z curve in the next few days. X2 on choosing the lowest output Z source possible. Most renowned example would be the XBA 3/4 (never tried 1/2), the sound changes every time they're plugged in a different source.
 
Dec 24, 2012 at 4:50 AM Post #1,747 of 4,896
saraguie said:
If this has been asked and answered already Mea Culpa.  What is the impedance of our beloved FT!334s with the stock cable?



To all my H. F. friends ~ appreciate all the help, advice, and shared passion.
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Happy holidays Sara, and all the rest of you!!
 
Dec 24, 2012 at 8:04 AM Post #1,748 of 4,896
Quote:
tranhieu said:
 
XO is one thing, the main problem here is BA drivers are very inductive, hence their unpredictable Z curve (it's not totally a hit-or-miss though, most BA's Z curves have few large peaks in the middle and a big jump towards the end). I might measure the Miracle's Z curve in the next few days. X2 on choosing the lowest output Z source possible. Most renowned example would be the XBA 3/4 (never tried 1/2), the sound changes every time they're plugged in a different source.
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It changes on multi way units as dedicated high frequency drivers may not have the rising impedance untill out of band. TF10 has dropping impedance, for instance.
 
XBA-4 Is a great example of some poor thinking ion the design phase. Xoverless multi driver units will exhibit all the anomolies of the individual drivers plus drop overall impedance at low frequencies from parallel connections. It's close to 6 ohms beow 100hz. The individual drivers needed a much higher initial impedance to begin with to accomplish their design goals.  
 
Dec 24, 2012 at 9:35 AM Post #1,749 of 4,896
Quote:
goodvibes said:
It changes on multi way units as dedicated high frequency drivers may not have the rising impedance untill out of band. TF10 has dropping impedance, for instance.
 
XBA-4 Is a great example of some poor thinking ion the design phase. Xoverless multi driver units will exhibit all the anomolies of the individual drivers plus drop overall impedance at low frequencies from parallel connections. It's close to 6 ohms beow 100hz. The individual drivers needed a much higher initial impedance to begin with to accomplish their design goals.  
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I wouldn't call it poor, 'peculiar' is more accurate. The XBA is designed especially for some DAP, not for any DAP. In fact, the best multiway system out there is one that uses no passive component. Those at Sony sure know what they are doing, however their aim might be a bit off here.
 
And I wouldn't worry much about the Z curve of BAs. Of course it'd be best to have a straight line but there are tons of great IEMs out there that have ugly curves since the raise in impedance can be treated acoustically for instance.
 
Dec 24, 2012 at 10:21 AM Post #1,750 of 4,896
Quote:
tranhieu said:
 Most renowned example would be the XBA 3/4 (never tried 1/2), the sound changes every time they're plugged in a different source.
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Interesting.......I have a pair of 3's coming next weekend. I'll be using them with HP-P1 on the road and then at home with the Audio~gd 11.32.......eager to hear the diff.  
 
Dec 24, 2012 at 10:23 AM Post #1,751 of 4,896
Quote:
tranhieu said:
 
XO is one thing, the main problem here is BA drivers are very inductive, hence their unpredictable Z curve (it's not totally a hit-or-miss though, most BA's Z curves have few large peaks in the middle and a big jump towards the end). I might measure the Miracle's Z curve in the next few days. X2 on choosing the lowest output Z source possible. Most renowned example would be the XBA 3/4 (never tried 1/2), the sound changes every time they're plugged in a different source.
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The problem hardly exists with 1,(I skipped 2, but have 1,3,4) but 3,4 changes a lot. Seems that it's been designed to go well with Sony DAPs.
 
Dec 24, 2012 at 3:49 PM Post #1,755 of 4,896
Quote:
milarepa said:
Man the 334's are sweet. I almost prefer them over my hd650's to almost any recording, except those cuts who really suits a giant space.
What an iem, gotta post a pic of my rig just to brag. I feel slightly euphoric after using this for six hours so far today.... 
 
 

 
Must have that silver-cable... Well, guess I'll have to sell off my best kidney on ebay to get there now 
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That looks really interesting. I think I can identify the iPod, the AlgoRhythm Solo, and the FitEar ToGo 334, but what is the amp? Thanks!
 
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