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Old 26th February 2011, 05:27 AM   #81
Blues is offline Blues  United States
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Up and running battery pack...the diy cable is a repurposed CAT6 with connectors for an SLA battery supply.
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File Type: jpg SLA Battery Cable.jpg (178.2 KB, 703 views)
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Old 26th February 2011, 04:58 PM   #82
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What are the range of resistances that your "engine" allows for the series LDR and shunt LDR? There is only one example of each in the spreadsheet, 30r for series and 35M for shunt. These predict -0.04dB through the attenuator and result in an impossibly high 118dB of SPL at 1m.
If I swap these values: 30r to shunt and 35M to series the spreadsheet predicts -95dB through the attenuator and <0dB SPL 1m from the speaker.
Are these valid LDR values for your "engine"?
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Old 26th February 2011, 05:15 PM   #83
Blues is offline Blues  United States
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I've had a bad history with you (this elephant has a fairly decent memory), so I care not to answer your question. I'll let you wallow in the riddle...
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Old 26th February 2011, 05:31 PM   #84
AndrewT is offline AndrewT  Scotland
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Generally, I don't hold grudges.
I simply ask for some information that would be helpful to me and possibly some other Members/Customers.
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Old 12th March 2011, 04:36 AM   #85
Blues is offline Blues  United States
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Default Captain Kirk's Dashboard Upgraded

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Old 13th March 2011, 11:17 PM   #86
Blues is offline Blues  United States
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Another pearl of a discovery from my local library -John Williams and the Boston Pops Orchestra's, "It Don't Mean A Thing If it Ain't Got That Swing". Special guest vocalist is Nancy Wilson (Cassandra Wilson's mom?).

The music is very dynamic, high levels never hurt the ears, light and airy big band sound -a lot of swing with the brass!...recorded in 1994 at the Boston Symphony Hall using Sony's 20-bit SBM technology says the literature.
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Old 13th March 2011, 11:47 PM   #87
Blues is offline Blues  United States
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R.I.P. Joe Morello -the legendary jazz drummer has passed away.
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Old 14th March 2011, 06:20 PM   #88
Blues is offline Blues  United States
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To answer several queries, here's a brief description of the completed Warpspeed (pics above)...

*It has a switchable Balanced/Unbalanced functionality; XLRs Pin 1=Signal Gnd, Pin 2=+, Pin 3=-
*2xQuad matched Silonex optocouplers
*Unbalanced has 1 input with 2 outputs paralleled for bi-amping; XLR pins 3 and 1 are shorted via a switch for Unbalanced
*It can be DC powered with an SLA battery at 12V with 5Ah or more capacity
*The power switch and power indicator flank the volume control in front
*The feet are machined black chrome stainless steel; the 'Squid is now in copper; the chassis body is anodized extruded aluminum; the volume knob is a 1.75" lathe-turned aluminum; the connectors are gold-plated Neutrik; silver on copper alloy contacts on switches; wire is silver-coated copper in PTFE (Teflon) insulation on 'Squid; and panels are cherry finished in oil and wax from an OR craftsman...planted a cherry tree this year to replenish.

Due to 2x quad matched optos being harder to come by, and my desire to get the product right, this Balanced/Unbalanced version is available as a completed unit only. Please email or PM for availability...Thanks!
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Old 19th March 2011, 06:37 PM   #89
Blues is offline Blues  United States
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Default Warpspeed Att Chart Updated

Last night I got the chance to verify my approximations on the Attentuation Chart (now version 1.3 attached) with measurements on all 3 digital Sources I mentioned a while back (a Toshiba, 2 Sony). The computed versus the measured values are validated and are very close.

The data and computed values are below the chart. Vary the Source Vout pk and it's corresponding Source Out Z and you'll find the measured is very close to the computed (Warpspeed Output Attenuation values). The data also shows the effect of going from a 200-ohm Source Z to 600 ohms and 900 ohms. Although the largest change is about 4dB (going from 200R to 900R) the subjective sound level difference is not much...for 200R I have to dial it down to about 10:30 as opposed to 12:00 for the 900R Source which are both comfortably loud.

The test is a simple 200mVrms, 1kHz test tone played on the Sources while measuring the output of the Warpspeed with a true RMS capable AC voltmeter. Since I already have the data with the unloaded Sources, it was just a matter of plugging in the measured values. Difference in measured values versus with an amp connected on the Warpspeed is very low at less the 1mV.

Btw, I've mentioned before that one of my amps is with 33k input impedance is actually 23k, it can be outright measured from the inputs because there is no input cap and is also the value reflected on the Aleph 3 manual.

I've also added more values on the drop-down list...let me know if you have any particular values you want added.

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File Type: zip Warpspeed Attenuation Chart 1.3.zip (12.7 KB, 82 views)
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Old 3rd April 2011, 02:44 PM   #90
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Dear Blues. I currently use LDR attenuator in my system and really like it. Few questions with regards to your kit:
I have LDR's placed in small boxes with RCA in and out connectors that are directly connected to the inputs on my power amps and are controlled from the central box by feeding necessary current to them. Can the same be done with your kit?
A also noted while playing with LDR parameters that sound quality can vary a great deal depending on the Rtot. of voltage divider. I managed to find an optimum for my system with my present attenuator but I am a bit concerned whether I will be able to achieve the comparable sound with your kit. (I read feedback in your thread but still cannot imply anything with regards to this).
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