If you still love Etymotic ER4, this is the thread for you...
Nov 11, 2020 at 6:26 AM Post #15,736 of 18,029

Deadleg

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These guys are in China but they will build you anything you want. I wanted a 50cm balanced cable with a 2.5 right angle plug and they made a very nice one. Sounds GREAT. Buy their stock cable on ebay and then immediately message them and tell them what you want and they will custom design it.
https://www.ebay.com/itm/1-2m-4ft-S...var=424688395138&_trksid=p2057872.m2749.l2649

Thanks a lot for this, just placed my order. If it seems solid when it arrives I'll probably order a spare and be set for a while!

Will try to remember to pop back with some impressions in a few weeks.
 
Nov 11, 2020 at 7:23 AM Post #15,737 of 18,029

carmatic

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Hi,
could you share your schematics? I am thinking how to possibly adapt these for ER4P
http://www.falstad.com/circuit/circ...YMgGBBd1WmAwGBC7SiYukVEYAHsmW8VJAFt1DnIBdEGEA
circuit-20201111-1323.png

I hope that the simulator looks understandable enough for you, the rightmost 45ohm resistor represents the ER4SR driver, the green graph represents the input, and the red graph represents the output to the driver

of note is that I have since removed the diodes and two-thirds of the resistors compared to when I took the picture, the diodes were there to protect the capacitors from reverse voltage but someone on the forums said that they weren't necessary, and each resistor is 100ohm so by going from 3 parallel resistors to 2, I have increased the resistance from 33.3ohm to 50ohm...it gives a higher ratio of bass to the sound and adjusting the potentiometers will have a bigger effect on the level of bass to each driver, but it does mean that I have to run my amp at full blast to get a normal volume out of them now, but I could use my ER4SR with even cheap amplifiers and there wouldn't be any background hiss

you will notice that 2 terminals of the inductor/transformer are not used, any current flowing on this side of the inductor/transformer at a certain frequency will also increase the current on the main side , so by adding more components on this side such as capacitors and more inductors, it would be possible to shape the frequency response of the inductor/transformer

Overall , as it is now, this is changing the frequency response in other ways than just increasing the bass and removing hiss... it seems to be attenuating the high frequencies in a way which makes everything sound 'distant' , I am suspecting that the resistors and potentiometers I am using have some inherent inductance to them which is causing some unwanted filtering of the high end
(or maybe a balanced armature driver is more complicated than a simple resistor with the same value as its impedance)

But, between the bass boost, and being in control of centering the bass response, this is an acceptable tradeoff for me...

As far as adapting to the ER4P, the only thing I can think of is to change the resistors and potentiometer, from 50 ohms (which I am using for my ER4SR which has 45 ohms impedance), to 33.3 ohms (to keep it proportional with the ER4P's 27 ohm impedance) ...
 
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Nov 12, 2020 at 8:44 PM Post #15,742 of 18,029

lesale08

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Adorama’s sale on the er4 series are outrageous. Good for the consumers who get the deals though.
 
Nov 13, 2020 at 6:50 PM Post #15,743 of 18,029

lesale08

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Nov 13, 2020 at 8:53 PM Post #15,744 of 18,029

trellus

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Adorama is destroying the resale value of these phones. I wonder how Etymotic feels about them discounting their products? Just goes to show how much profit there is in this stuff. Maybe they're knockoffs?

Got mine from Adorama and they sound super good to me and came with an official card from Etymotic - I doubt they are knockoffs but if they were they are damn good ones

6CAF9335-2569-4515-926D-2AFA4B5C85E7.jpeg378571D9-CD2D-4C2B-A50D-A9D3C801FB7F.jpeg
 
Nov 14, 2020 at 4:34 AM Post #15,746 of 18,029

lesale08

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... and the ER3 series for $89 - crazy times for consumers!
Oh my so very tempted to get that 4sr. That’s better than the deal I got for the 4xr. Lol
 
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Nov 14, 2020 at 10:19 AM Post #15,748 of 18,029

alterndog

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I just jumped in the adorama sale for the XR. I have been wanting something with detail and clarity to compliment my FutureSonic G10 which are amazing for bass heavy music.
 
Nov 14, 2020 at 10:25 AM Post #15,749 of 18,029

Luis Mad

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