A quick update on my quest for iPod video + ER4s portable amplifier from a few posts ago. I ended up going for Graham Slee's Voyager. Ugly, bulky and... sounds fantastic. It does not deprive the etymotics of the characteristics I enjoy about them and builds on them in a very musical way. Lots...

Hah, that must be it. Alo RX has a negative gain of aproximately -14.6 dB...

I have no idea if that's recommended, but maybe that would be good for your use so long as you remain on a low voltage source https://www.headfonia.com/alo-rx-high-gain/ Thanks for the link. This is the older model that was not designed for IEMs. Apparently the new Alo RX would need to be sent...

Re the earlier post on ER4s current (2019) amplification options Unfortunately, it turns out that the Alo RX does not drive the ER4s at all. The output is very quiet via the Ipod's 5.5 3.5mm jack (already amplified via the Ipod's internal amp) and very very quiet via the 30pin signal out...

Oh interesting! So they were out of warranty and they still decided to repair them for you? No, the repair was priced sensibly (the cable needed replacing and it cost me $50 plus shipping) so I had to pay for it but the fact that I could service them after so many years rather than chuck it in...

I repaired my original set of ER4Ps back in 2013 (one of the drivers was distorting the sound) 5-6 years after the original purchase. Excellent service and priced sensibly the earphones still going strong. Having the ability to service them if necessary was reassuring enough.

ClieOS & FastAndClean Thanks for the reassurance, I will give the amp a try given its IEM designation and will post some impressions.

Thanks for the reply. Hmm, I really wanted to get this: Alo RX as it is a dedicated IEM Amp but is the eR4s impedance too high for it? https://www.aloaudio.com/shop/rx/

Hello All, I've been digging through archived on portable amp for Er4s and found a lot of information with products that are no longer made. I've revived my iPod 5.5 classic with a new battery and I am looking for a decent portable amp in 2019. I have tested the ER4s on my Yamamoto ha02...

Thanks for the suggestion. The amp was purchased a couple of months ago from a German distributor so the device was meant to be used in Europe at 230V, which includes the UK. I hope the manufacturer would set the voltage appropriately (?)   The fact that the delayed hum shifted from one...

Hi there,   I purchased an unused HA02 amp recently and it turned out that one of the original WE tubes is faulty (starts humming after about 30-45min of use). I got some NOS Philips JAN 408a (a readily available replacement here in the UK) to see whether the problem was tube-related and...

Here are some quick impressions following a test-drive of the new UL Solo.   My intention was to find out how the UL Solo + Green PSU compares against the 2008 Solo + PSU1 as I have been planning to upgrade with either the DIY pre-populated UL board or by adding the PSU1 as the cost is...

Hi Marco, Thanks for your opinion. I may have a chance to compare the two very soon. It's good to know they're two different animals so the change may not be for the better. I am really curious to hear what improvements the PSU1 will bring with the GreenSolo.  I will share the findings. 

Hi all, I have been a Solo Green 2008 user (ath w5000 headphones) for about three years and I feel it's time for an upgrade. I am considering either purchasing the PSU1 unit as I am currently using the supplied wallmart type plug or upgrade with the DIY Ultra Linear kit instead and...