Mungo Posted January 9 Report Share Posted January 9 Hello, for a ultra light setup I had the idea to convert a MixPre 6-II into an eng mixer. It surprisingly performs absolutely well with 1 or 2 camera hop transmitters and even a wireless camera return. Unbalanced out but no rf noise struggle at any time, at high level output though (+6dBu). But when using the audio output for serious wired applications that little unbalanced 1/8 inch jack is just not suitable enough. So I want to build a small and light passive kind of DI box permanently connected to the mixpre for the bag. The 1/8 jack could stay connected forever and probably held tight by a 3D print. I found no DI boxes on the market that are handy enough for the bag. Yes, there's the Neutrik NA2M, but it only handles up to -3dBu. I found this: https://www.lundahltransformers.com/wp-content/uploads/datasheets/SIB15.pdf which might be right ok. But still a little too bulky and way too expensive. The manual of the SIB15 says that there a only two Lundahl LL1532 transformers built in, which can be purchased as a solo component too: https://www.lundahltransformers.com/wp-content/uploads/datasheets/1532_1593.pdf But when you google the LL1532, many sources call this is Mic level transformer which I don't want. I want to go out unbalanced from the MixPre with +6dBu. Do I need the LL1531 https://www.lundahltransformers.com/wp-content/uploads/datasheets/1531.pdf instead? Or why are the 2x LL1532 in the SIB15 capable up to +12dBu, in the LL1532 datasheet 6dBu less? I'm quite confused, which ones should I order? They are not cheap at all so I don't want to spend money for trial and error. Thx in advance! Quote Link to comment Share on other sites More sharing options...
Philip Perkins Posted January 9 Report Share Posted January 9 I very strongly recommend that you ask the folks at Lundahl. I had a similar need some years ago, wishing to use Jensen transformers. I was able to get an "audience" with Deane Jensen himself, and armed with the schematics of all the devices he made a recommendation which was not the trafo I was originally looking at. His recommendation was great and we used that box on nearly every job for years. Ask the makers themselves! Quote Link to comment Share on other sites More sharing options...
New Alighieri Posted January 22 Report Share Posted January 22 I’d love to hear how this develops! Quote Link to comment Share on other sites More sharing options...
ronmac Posted January 22 Report Share Posted January 22 Not as romantic as a DIY solution, but this will do the job: https://www.radialeng.com/product/stagebug-sb5 Quote Link to comment Share on other sites More sharing options...
The Documentary Sound Guy Posted January 22 Report Share Posted January 22 If it's like the other Radial boxes, that's going to be awfully heavy to add to a bag setup. I love my Radials, but they're not light! Quote Link to comment Share on other sites More sharing options...
Allen Rowand Posted January 22 Report Share Posted January 22 If it doesn't have to be Lundahl… https://rdlnet.com/product.php?page=166 Quote Link to comment Share on other sites More sharing options...
ronmac Posted January 22 Report Share Posted January 22 24 minutes ago, The Documentary Sound Guy said: If it's like the other Radial boxes, that's going to be awfully heavy to add to a bag setup. I love my Radials, but they're not light! It weighs 250 grams, so I guess that is why they call it a "Bug" and not a "Turtle" 😀 Quote Link to comment Share on other sites More sharing options...
The Documentary Sound Guy Posted January 22 Report Share Posted January 22 Ok, that's about half the weight of the boxes I have. Still seems like a lot, but I'd imagine any decent transformer will set a certain minimum weight. Quote Link to comment Share on other sites More sharing options...
ronmac Posted January 22 Report Share Posted January 22 You can reduce weight and size by removing the cable holder on the side. Quote Link to comment Share on other sites More sharing options...
Mungo Posted January 24 Author Report Share Posted January 24 On 1/22/2022 at 10:04 AM, New Alighieri said: I’d love to hear how this develops! They didn't reply, so I went on with my research. I will switch over to Neutrik NTL 1 which is way easier to buy here. Also it's more versatile (600/10k) and its pins match with standard universal circuit boards. Due to other projects this will take some time, but I'll keep you informed. Quote Link to comment Share on other sites More sharing options...
TVPostSound Posted March 6 Report Share Posted March 6 Wouldn't it be better to sell the MIXPRE6, and get a MIXPRE 10 II? The extra TA3 pair will save you all that trouble! +18dB An extra 2 input channels too!! I saw one for sale here, pretty much unused. Quote Link to comment Share on other sites More sharing options...
Mungo Posted April 8 Author Report Share Posted April 8 News to this thread: It works well, very well, at first impression. No distortion, no noise, quite clear and rich sound. I can't say much about the exact output level and about low frequency respsonse. That will take some time for examination and I will write it down here. When switching parallel to a camera hop transmitter (Sony DWT-B01N), there is a slight level drop (about 1-2dB), but still good sound. Quote Link to comment Share on other sites More sharing options...
Mattias Larsen Posted April 13 Report Share Posted April 13 Awesome! Any chance we can see some pictures and possible breakdowns? Quote Link to comment Share on other sites More sharing options...
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