leeperry
Galvanically isolated his brain
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- Apr 23, 2004
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I tried the Firestone ILoveTW DAC through ADuM4160, and TE8022L is entirely compatible up to 24/96....the nice added value is 88.2kHz support =)
So, I got my battery in the mail today and nothing has exploded yet. I'm impatient so I put it on the charger for about 30 minutes to get some testing in before going out.
The battery certainly makes an improvement,although it requires careful listening to notice. In comparing to the DI w/ isolator but no power supply, the Improvements seem to be 'sharper' sounding string instruments, 'blacker' background, and slightly more low level details and ultra low frequency bass (<30hz) likely as a side effect of the 'blacker' background.
In one of my main test songs, "Invisible Man in a Fluorescent Suit" by Shpongle, the opening 60 seconds has significantly more subtle details (especially the 'pat tat tat' sort of sound around 0:50-1:00) and the violin sounds more realistic like there is a quicker transition from one movement of the bow to the next. Around 1:59 there's some details in the background that used to be pushed back and required active listening that are now very clear. The drop at 2:29 and subsequent bass-intensive portions thereafter seem to reach deeper in the 20-30hz range.
Overall, it seems like a great upgrade that's worth getting over the power supply. I still can't really tell much of a difference using the power supply, such that it could just be a placebo. The battery is definitely an upgrade in sound quality, but I would say the USB Isolator and hex inverter swap are higher priority upgrades for the DI-V1. The difference in sq upgrade is somewhere between the isolator/hex inverter upgrades and upgrading the USB cable (I use a Furutech GT2).
By the way, regarding the whole switching between battery and usb thing I found it remarkably easy. Sometimes just flipping the switch works (especially if you're not playing anything), but if it doesn't these seem to have 100% success rate:
Switch from USB to Battery:
-Stop all playback on computer
-Unplug USB from DI
-Switch to battery
-Plug USB back in
Switch from battery to USB:
-Stop playback
-Unplug USB from DI
-Switch to USB
-Plug USB back in
edit:
P.S. No dropouts yet on battery, noticed some when switching to PSU.
edit2: changes seem more immediately noticeable on speakers -- very immersive soundstage and deep bass.
The battery makes a very noticeable improvement without the USB isolator, so perhaps they're at about the same priority level for an upgrade. Adding the isolator just makes it that much better. So, as much as leeperry might complain about the switching regulator on the isolator it still seems to beat whatever is coming straight out of the USB. All my impressions are with battery direct to di, not going through the isolator.
Keep in mind that the DI doesn't have a real pulse transformer on its coax output, but a cheaper ferrite bead that doesn't provide full galvanic isolation IME...more like 60dB'ish FWIR.
I'm now using another 4160 dongle that has an unregulated PSU input that feeds both the USB device itself and the device side of 4160. SQ is stunning w/ a 5V/1A linear regulated PSU
JulienM said:I've been away from this thread for too long... Could someone please point me to the discussion on replacing the hex inverter?
Besides, I also want to know which inverter you think is the best.
Not sure if faster hex inverters will be for me. It looks like the sound like fast op-amps: detailed but fatiguing... But I'll give it a try anyway, it's easy enough.
What USB cable are you using? I've tried a few "audiophile" USB cables, and kept going back to Monoprice. I feel they are more neutral, less colored. Subtle, but there.
Ok, I have scoured the internet and finally found two batteries with appropriate size barrel connectors.
To answer kr0gg above: as long as you buy batteries that say they have "PCB" or a "protection control module/PCM" or some variant thereof, you should not have to worry about undercharging the batteries. From what I've seen, most of these PCMs trigger a cutoff when voltage reaches 5V, which is still within the DI's input parameters. That is probably why Kingwa insists on 7.4V and not something like 6V. You're not going to find any inexpensive batteries with a charge indicator or anything, so you'll just have to wait til it stops working or periodically recharge (not a problem with Li-Ion since there's no memory effect).
Regarding hex inverters, I've noticed that 74AHCU04N provides slightly greater instrument separation and spatiousness in music compared to stock, but the change is more a difference in sound signature than an improvement, with the stock having a slightly warmer and thicker sound. The Olimex Isolator (fed by AG PSU) and upgraded USB cable (ACR silver on audiogon) made slight improvements in that the sound became less muddy and more detailed. The isolater made the most difference in my system, followed by usb cable and hex inverter.
It was a bit tricky finding the hex inverters. I got mine from mouser.com, as suggested by somestranger. They are cheap so I got several of them (e.g., [SIZE=9pt]595-SN74AHC04N, [/SIZE][SIZE=9pt]595-SN74AHCU04N, [/SIZE][SIZE=9pt]512-74VHC04N) [/SIZE]to make the shipment cost worthwhile and do some inverter rolling =).
Thanks for the links. I think I'll jump on the battery bandwagon. which of the two batteries did you get?
Do you know if this is the case for the DI-V2?
Which Adum4160 dongle are you using now with the dual psu inputs? Sounds interesting.
I also have the the ACR cable... I went back to monoprice after a few months though. I felt the ACR sounded soft. But I think it's time to revisit... Maybe I should build my own USB...
Were you able to compare different hex inverters?
I have the new DI-DSP on order, so all that might be irrelevant if the new DI sounds better than he original. But I'm still keeping my old one for a less critical system...
Dear Igor,
The new DI have better detail and neutral sound than the old DI,
But if for the warmer side sounding, the old DI is better.
Kingwa