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LISA III Available for Order - Page 21

post #301 of 1070
Sure, at MAx volume you can hear some hiss. But there is no headphone on earth that would make use of max volume on a standard Lisa. I don't get to near 12:00 with my 600 ohm Beyers...

Jamato, the LISA sounds heavenly with the Denon D5000's...great match, since you can tune the D5000's bass, and the very extended highs of the Lisa make the D5000 sound just ethereal.
post #302 of 1070
nah, i just wanted to know whether the gain of nearly 5 would be low enough to make sure it's hiss free at max volume. I knew it would, but i just want to know how significant it is. ppl's amps has always been my reference for sound quality

Oh and I'm a perfectionist, please forgive me on this one XD
post #303 of 1070
I've got an Expedition Lisa III. It's dead quiet with HD650, however there is hiss with ath-900ltd even with volume completely off, but it's not as bad as my PRII which's I think got the normal gain. Since HD650 is my main phone so I don't really care the hiss with ath-900ltd. Lisa III sounds so good and the battery in Expedition really lasts. It's simply better than PRII.
post #304 of 1070
My standard LISA starts hissing with Rs-1 when turning the volume pass 12.
I never go pass 9.00 with my RS-1 .
post #305 of 1070
I used to own some Grado's. I think Grado's is not as sensitive as audio technica phones, so it didn't hiss as bad as audio technica with same amp.
post #306 of 1070
If an Amplifier is quiet at minimum Volume and you hear Hiss as you rotate the Volume clockwise then the hiss is from your source not the amp because the Volume control is connected to the amps inputs and at min. Vol the input is not connected to the source at all so any Hiss from the Amp will be Present regardless of the Volume Position.
post #307 of 1070
Yeah, so there, get a new source!

This amp looks to be very interesting. It is exciting when new products (I realize it has been developing for a while) hit the market that don't cost an arm and a leg and can produce, from what I am reading, the high quality sound that this amp does. Since some headphones are found to be lacking in the lower bass region I can now see the value of the base contour and this would seem to be a great feature.
post #308 of 1070
Quote:
Originally Posted by jamato8 View Post
I am sorry but after going to the web site I am still confused. The amp comes with rechargable batteries installed and attached inside but does it come with any outside adapter to charge these or do you have to purchase one? Do you use a 24 volt regulated? I would imagine it is on the pages somewhere here but I didn't find it spelled out on the web site.

I still don't understand the additional power supply. It doesn't bypass the batteries but does or doesn't improve the sound? An Elpac would work fine would it not or is the power supply developed for this unit a slight or modest upgrade in performance, sound or otherwise?
The DC power Jack is switched so when you insert the DC power Plug into the Jack on the rear of the Amp the batteries are no longer connected to the amp but instead are connected to the charging circuit. the Charging circuit is completely Bypassed when the AC adapter Plug is not inserted into the Amps DC power Jack.
post #309 of 1070
Quote:
Originally Posted by ppl View Post
If an Amplifier is quiet at minimum Volume and you hear Hiss as you rotate the Volume clockwise then the hiss is from your source not the amp because the Volume control is connected to the amps inputs and at min. Vol the input is not connected to the source at all so any Hiss from the Amp will be Present regardless of the Volume Position.
My experience is a bit different. The amp is quiet at all volume position (with my K701 balanced with SE converter plugged in) - as long as I do NOT touch the knobs. When I have my finger on either of the knobs there is some slight hum/hiss coming to my ears (with no music playing). The loudness of this hum/hiss does not seem to relate the the volume setting. I guess this is some sort of static but here in Hong Kong we are having a very wet day so I doubt where the static comes from.

Strange....

Anyway, when music starts to flow, all these don't matter any more :-)

F. Lo
post #310 of 1070
Quote:
Originally Posted by ppl View Post
The DC power Jack is switched so when you insert the DC power Plug into the Jack on the rear of the Amp the batteries are no longer connected to the amp but instead are connected to the charging circuit. the Charging circuit is completely Bypassed when the AC adapter Plug is not inserted into the Amps DC power Jack.
Ok, now I see and that is what I wanted to know. So I can also see why your power supply, that is more than a mere wallwart, would be of an advantage.

Will the amp run from 19 volts or does it require 24 volts from the DC jack?
post #311 of 1070
Quote:
Originally Posted by fkclo View Post
My experience is a bit different. The amp is quiet at all volume position (with my K701 balanced with SE converter plugged in) - as long as I do NOT touch the knobs. When I have my figure on either of the knobs there is some slight hum/hiss coming to my ears (with no music playing). The loudness of this hum/hiss does not seem to relate the the volume setting. I guess this is some sort of static but here in Hong Kong we are having a very wet day so I doubt where the static comes from.

Strange....

Anyway, when music starts to flow, all these don't matter any more :-)

F. Lo
Actually, mine does that too, when plugged into the AC by the Elpac supply only (not when running on batteries).
post #312 of 1070
I experienced this issue as well.
post #313 of 1070
Quote:
Originally Posted by Bolardito View Post
And what happens with the standard Lisa III? Can I charge the batteries while using the amp? How long can I use the amp while plugging to the Elpac adaptor without damaging the batteries or the circuit??
I have a pre production Lisa 3 standard that has been charging for 15 days without being run at all, so there has been no discharge. I wanted to see if the batteries would get hot so it is out of the case also. This unit is using the standard 9 volt size batteries and is being charged by a 600 ma 18 volt( shows 24 volt with no load) wall wart. So far the batteries remain cool to the touch as does all amp components. With a 200 milliamp or larger dc charge the amp will run at full audio while charging the batteries. My first test ran the amp continuously for 4 days, 24 hours a day at full volume into a set of headphones while plugged in to 200 mw wall wart. The amp was drawing max current the whole time and the batteries stayed fully charged. I hope this helps.

In my testing the charger does not change the audio quality or volume in any way when plugged in as long as your batteries are not below 10 volts or so.
post #314 of 1070
I would be interested for ppl to address your findings. For one thing, I believe the bias is different on pre vs the production Standard Lisa III. Production Standard units drain the battery faster due to the increased bias which further tweaks the amp for even greater SQ.
post #315 of 1070
Quote:
Originally Posted by ppl View Post
The DC power Jack is switched so when you insert the DC power Plug into the Jack on the rear of the Amp the batteries are no longer connected to the amp but instead are connected to the charging circuit. the Charging circuit is completely Bypassed when the AC adapter Plug is not inserted into the Amps DC power Jack.
Yep. The source will contribute to hiss and hum more than the amp. I've tweaking a few source and I find the quieter source will determine if the whole rig is noisy or not
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