Geek Pulse: Geek desktop DAC/AMP by Light Harmonics

[belisk]

Black is Black...I want my baby back...

extremely nice design, take my money now!

 

[uncola]

It's nice but I still think the colored V designs are the best.. I like how metallic the faceplate is

 

[AxelCloris]

I know this pair was mentioned in a post around the time the LPS was announced, but I came across this article on the lhlabs forums. Pretty interesting, and seems like the Geek Pulse is going to be better than the Prime at a fraction of the cost. What is the MSRP for an upgraded Pulse with the LPS4, $1200 or something?
 
http://www.computeraudiophile.com/content/552-meridian-prime-headphone-amplifier-review-prime-power-supply-sneak-preview/

 

[m-i-c-k-e-y]

Added link to Google Doc (made by a GF member) on first post. On Features and Specification of all Geek products and it's derivatives. 
 
It will be updated periodically and its NOT FINAL. 

 

[blueangel2323]

  Black is Black...I want my baby back...
 

Wow that looks really sexy! Wouldn't hurt to be shorter and wider though.

 

[m-i-c-k-e-y]

Thanks!

We'll it depends on the final case measurements.

Last time I heard, they opted for a wider case to accommodate more connections at the back.

 

[uncola]

My vision board.  Hey the secret worked for oprah
 

 

[eliwankenobi]

Lol!

There should be enough space for the Pulse and the LPS next to it

 

[jexby]

  Added link to Google Doc (made by a GF member) on first post. On Features and Specification of all Geek products and it's derivatives. 
 
It will be updated periodically and its NOT FINAL. 

 
thank you!  was very excited to find/link this google Doc.
 
a quick aside, as I can't discern and haven't found an answer from Larry H on this:
 
is the Headphone Out Max Power (mW at 16ohm) for Geek Out,
a *combined* mW value for BOTH Left and Right channels ?
 
ie.  Geek Out regular says 450mW at 16ohm.
so is that
a) 225mW to left ear cup and 225mW to right ear cup?
or
b) 900 mW "total" (450mW x 2) output to the headphones?
 
I'm guessing it's a).
 
for Geek Pulse google Doc,
the max Headphone Out values in question (summed or not?) appear to be:  100mW, 500mW, 3000mW.

 

[miceblue]

It's the total output power derived from the maximum output voltage at 16 Ω. So A is correct.

V = I * R (Ohm's Law : voltage in volts equals current in amperes times resistance in ohms)

I = V / R (re-arranged version of Ohm's Law)

P = I * V (power equation for electricity: power in watts equals current in amperes times voltage in volts)

P = (V / R) * V (substituting the re-arranged version of Ohm's Law into the power equation

P = (V^2) / R


Since music varies over time, we can find the average power with respect to an average voltage (volts root mean square, or VRMS).

P_average = (VRMS^2) / R


The Geek Out is rated to have a maximum output voltage of 2.65 VRMS at 16 Ω. Plug away!

P_average = ([2.65 VRMS]^2) / 16 Ω

P_average = 7.0225 VRMS^2 / 16 Ω

P_average = 0.43890 watts, or 438.90 milliwatts

 

[nick v]

I put my order in yesterday for a Geek Out + Geek Pulse bundle with the Geek Pulse X upgrade. I'm really excited for both of these products!! Nothing on the market seems to compete as far as features, parts quality, technical specifications and price.
 
I have a couple questions:
 
If you purchase as part of the second indiegogo campaign (that's on right now) do we still get to capitalize on the stretch goals that were achieved before the initial campaign expired? (Lightspeed Jr. USB Cable, 2 year warranty, Digital Out, Remote Control port and internal parts upgrades)? I sure hope so!
 
Also, I've been reading an obscene amount about these products for the past few days but haven't seen mention of any specifics on the $119 USD 'Internal Amp Upgrade'. Is this the op-amp upgrade? It would sure be nice to see the http://bursonaudio.com/DIY_HD_Opamp.htm as an option or at least the OPA 627 Dual op amp modules. Is there any info on where they're going with this?
 
Thanks

 

[miceblue]

Also, I've been reading an obscene amount about these products for the past few days but haven't seen mention of any specifics on the $119 USD 'Internal Amp Upgrade'. Is this the op-amp upgrade? It would sure be nice to see the http://bursonaudio.com/DIY_HD_Opamp.htm as an option or at least the OPA 627 Dual op amp modules. Is there any info on where they're going with this?

Thanks

Yes, the internal amp upgrade is the op-amp upgrade.

I don't recall seeing a post about what specific amp is to be chosen as Larry is still determining which op-amp to use.

 

[AxelCloris]

Yes, the internal amp upgrade is the op-amp upgrade.

I don't recall seeing a post about what specific amp is to be chosen as Larry is still determining which op-amp to use.

 
Larry has given us a list of about 5-6 opamps that he's testing but he hasn't confirmed what he'll be using just yet. It's probably going to be a bit before he confirms which is the regular and which is the Indiegogo exclusive upgrade.

 

[nick v]

I found this over at the Geek Temple:
 
"Here is the list from my past experience. All Amp here will be bias into class A and put the best decoupling and shortest pcb trace...
* AD797 (precise, clean, almost could not be wrong choice. pin8 tweaking is the key)
* OP827 (a little bit more euphonic, makes music. JFET input!!)
* OP1621 (endless highs, solid bass, not so good in mid as OP827)
* LME49990 (after output RLC compensation, it kills the giants)
* LME4562 (TI, ESS loves it in reference board, pretty numbers, not much characteristics...)
...
Just want you guys to know, this final approach is getting to the fun part. A lot of subjective stuff here.
And this is also the place that test the cook how to make the best meal."
 
I was hoping to see the OPA 627 or better yet upgrade to Burson discrete op amps (would surely be more expensive) but I'm sure Larry knows what he's doing!

 

[dclaz]

Are the op amp upgrades the only improvement with the 'internal amp upgrade' perk? I didn't think those components cost 'that' much, but I could be thoroughly mistaken.
 
I hope that they end up using whatever op amp results in the output with the best measurable properties.