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Author Topic: Naiant Littlebox v1.5 - turn off phatom power  (Read 3260 times)

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Offline JimmieC

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Naiant Littlebox v1.5 - turn off phatom power
« on: April 16, 2014, 04:00:57 PM »
The Littlebox (v1.5) I picked up has a 3-way switch to turn the power from low voltage (P20V), off (turns off unit), and high voltage (P48V).  Can the this preamp be operated as an amp without supplying phatom power?  If I use the low voltage (P20V) power would it damage the playback / source system if it doesn't need or take phantom power?
« Last Edit: April 17, 2014, 04:35:43 PM by JimmieC »
OH Grown
Mic:AKG C460B(CK61)/HM1000(CK32/CK47), Naiant Couplings/PFA, ADK-TL; Preamp:Lunatec V2, Naiant Littlebox v1.5; Rec:Tascam DA-P1/DR-100mkii/DR-680; Cable:GAKcables; Bar:Shure A27M, Robb Bar 23-cm, it-goes-to-eleven DINa Active Bar, GAK 3' Bar; Mount:Shure A53M, Audix MC-MICRO; Clamp:AKG K&M 237, Photek Grip Clamp w/Manfrotto 042; Stand: Manfrotto Alu Master 3 Riser 12' AC Stand/122B, Lowel Full Pole; Battery:18000mah Universal Lithium Battery; Playback:laptop>Schiit Modi>Yamaha HTR5890>Klipsch Synergy F2. My recordings on LMA

Offline obaaron

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Re: Naiant Littlebox v1.5
« Reply #1 on: April 16, 2014, 05:07:11 PM »
Mine has the same switch but also has another switch to turn mic power on/off.  Im guessing that you need this switch to still pass a signal minus phantom
Mics:  Gefell M20,M21/sms2000/nbob | Schoeps MK4V/cmc6/nbob | AKG c460b/c480b/a60/Naiant actives - ck61,62,63,69 ;ck1,3,8;ck1x,2x,3x/MK46 | Neumann KM140/150/Nick Mod LC3/Naiant PFA| AT853, AT933 | CA-11c,o
Pres: Naiant Littlebox | Tinybox | BMod Edirol UA-5 | Church ST-9200
Recorders:  Zoom F8 | Tascam DR-680 | Tascam DR-60D | Sony PCM-M10
Video: Canon VIXIA HF R42

**ISO** -   Schoeps mk22 matched pair | Gefell M27’s |

Offline JimmieC

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Re: Naiant Littlebox v1.5
« Reply #2 on: April 16, 2014, 05:27:28 PM »
OH Grown
Mic:AKG C460B(CK61)/HM1000(CK32/CK47), Naiant Couplings/PFA, ADK-TL; Preamp:Lunatec V2, Naiant Littlebox v1.5; Rec:Tascam DA-P1/DR-100mkii/DR-680; Cable:GAKcables; Bar:Shure A27M, Robb Bar 23-cm, it-goes-to-eleven DINa Active Bar, GAK 3' Bar; Mount:Shure A53M, Audix MC-MICRO; Clamp:AKG K&M 237, Photek Grip Clamp w/Manfrotto 042; Stand: Manfrotto Alu Master 3 Riser 12' AC Stand/122B, Lowel Full Pole; Battery:18000mah Universal Lithium Battery; Playback:laptop>Schiit Modi>Yamaha HTR5890>Klipsch Synergy F2. My recordings on LMA

Offline jibooer

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Re: Naiant Littlebox v1.5
« Reply #3 on: April 16, 2014, 05:50:03 PM »
Paging Jon...
Mics: AKG c460b (ck61, ck62, ck63, ck1x, ck3x), NBob Actives, Naiant Actives, ADK A-51TL
Pres: Lunatec V2, Sound Devices MP-2
Cables: GAKables exclusively, AKG MK46, Naiant PFA's
Recorders: Edirol R-09HR, Edirol R-44
CPU for DSP: Toshiba Satellite A660 i7 > audioengineD1
Cans: ATH-50
VINYL: Dual CS741Q > Rega Brio-R > Wharfedale EVO2-30

Offline Phil Zone

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Re: Naiant Littlebox v1.5
« Reply #4 on: April 16, 2014, 08:20:42 PM »
Like obaaron said, that can't be the case you must have a mic power switch. It's a special option that a few littleboxes have floating around. So the one you have cannot do it. Below is a picture of mine so you can see
Microphones: Busman BSC-1, AKG C460B/CK61/CK63, Samson CL2, CA-14 (cards), Naiant X-X
Preamps: Naiant Littlebox [X3] (OT)(OT/IT)(OT/Black), Naiant Tinyhead
Recorders: Tascam DR-680, Sony PCM-M10, Tascam DR-05
Software: Sony Sound Forge/ Vegas, TLH
Photo: Canon 7D Mark ii/70D, 70-200 f2.8, 18-135 STM, 55-250 STM, Tamron 17-50 f2.8, Tokina 11-16 f2.8

LMA Shows: http://archive.org/search.php?query=taper%3A%22Cam%20Keough%22&sort=-date

Offline JimmieC

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Re: Naiant Littlebox v1.5
« Reply #5 on: April 16, 2014, 09:02:18 PM »
Not a big deal especially if major surgery.  I was just going to put some music through it from playback system with the output tranformers on/off and different gains to see a difference or saturation.

Is it true a xlr cable could be built with resistors that could remove the dc power and just pass the signal?
« Last Edit: April 16, 2014, 09:04:12 PM by JimmieC »
OH Grown
Mic:AKG C460B(CK61)/HM1000(CK32/CK47), Naiant Couplings/PFA, ADK-TL; Preamp:Lunatec V2, Naiant Littlebox v1.5; Rec:Tascam DA-P1/DR-100mkii/DR-680; Cable:GAKcables; Bar:Shure A27M, Robb Bar 23-cm, it-goes-to-eleven DINa Active Bar, GAK 3' Bar; Mount:Shure A53M, Audix MC-MICRO; Clamp:AKG K&M 237, Photek Grip Clamp w/Manfrotto 042; Stand: Manfrotto Alu Master 3 Riser 12' AC Stand/122B, Lowel Full Pole; Battery:18000mah Universal Lithium Battery; Playback:laptop>Schiit Modi>Yamaha HTR5890>Klipsch Synergy F2. My recordings on LMA

Offline JimmieC

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Re: Naiant Littlebox v1.5
« Reply #6 on: April 16, 2014, 09:35:28 PM »
Thanks for all the responds and info.
OH Grown
Mic:AKG C460B(CK61)/HM1000(CK32/CK47), Naiant Couplings/PFA, ADK-TL; Preamp:Lunatec V2, Naiant Littlebox v1.5; Rec:Tascam DA-P1/DR-100mkii/DR-680; Cable:GAKcables; Bar:Shure A27M, Robb Bar 23-cm, it-goes-to-eleven DINa Active Bar, GAK 3' Bar; Mount:Shure A53M, Audix MC-MICRO; Clamp:AKG K&M 237, Photek Grip Clamp w/Manfrotto 042; Stand: Manfrotto Alu Master 3 Riser 12' AC Stand/122B, Lowel Full Pole; Battery:18000mah Universal Lithium Battery; Playback:laptop>Schiit Modi>Yamaha HTR5890>Klipsch Synergy F2. My recordings on LMA

Offline TSNéa

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Re: Naiant Littlebox v1.5
« Reply #7 on: April 18, 2014, 09:34:08 PM »
Capacitors, not resistors.

Hello Jon,

I have a somewhat similar question. I hope I'm not off topic.

I own a "naked" Littlebox (two 3-positions switches, on the right side of each knob) and I was considering using it sometimes with a dynamic microphone, but those are said to dislike P48, unless it is strictly balanced, which I can assume as you built it but not check... :-[  And anyway I cannot imagine how any voltage could reach the coil / the ribbon as those are isolated from the shield in a balanced cable  ???
So in order to get rid of any hazard, what would be the best solution?
  • send it back to you for some "major surgery"?
  • use a dedicated cable with capacitors ? In that case, what would be the right specs for them? And where to solder them: in-line with each signal conductor or across each conductor and the shield?

Thanks in advance for your answer.

Offline TSNéa

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Re: Naiant Littlebox v1.5 - turn off phatom power
« Reply #8 on: April 19, 2014, 02:49:43 AM »
Thanks Jon for this very helpful answer. I suppose the item you refer to is the ITP Inline transformer-coupled microphone amplifier?

The two mics I have in mind are a ribbon Beyerdynamic M160 (most of people know, I guess) and a LEM DO21B, a moving-coil one (French made, pretty rugged and used by French TV channels for decades in ENG and variety shows (even for singing but no longer!):
http://www.dcaudiovisuel.com/product_info.php/products_id/240/language/en



I bought mine used from a magician, more than thirty years ago. Still working.

If I read correctly the ITP specs, I can use any of those mics (in mono interviews), either through my Littlebox to my Olympus LS-5, or directly into the LS-5 (in a light configuration) with "a variable gain range of +22dB to +42dB"? It sounds nice... I'll PM you.

End of the off topic. Sorry for that and thanks you all.  :)

« Last Edit: April 19, 2014, 02:55:46 AM by TSNéa »

 

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