I've found that the TBP12 beltpacks are indeed capable of providing a truly transparent signal path via my XD-V70 & 75 receivers.
Would your budget maybe allow consideration of "splitting the difference" in price by going for that TBP12-enabled switchable modeling in an XD-V55L ?
I would have thought that the slightly larger investment would pay off in terms of both more flexibility and extra range, ...really handy for your intended audiometric application.
Currently Being ModeratedSep 13, 2012 12:40 PM (in response to RonMarton)Re: XD-V35 High pass filter
It's not rely a budget question (as long as it'a one third of the price of the lectrosonics). The 35' seems more handy to bring in a backpack. I do some travelling and keeping it small and light is a big plus. As far as I can read the 35-55-75have the same range, or am I mistaken? Do you know if the high pass in the 35 can be switched off?
I'm almost certain it can't...
But whether that's a actually problem would depend on the specific type of audio analysis you have in mind.
Bear in mind that the industry-leading Brüel & Kjaer measurement mic (by way of an example) is flat all the way down to a truly subsonic 15hz and that, in the interests of self-defence, ANY mass-produced wireless system is specifically configured to avoid passing anything below 20Hz.
(Incidentally, price notwithstanding, the "bulletproof" Lectrosonics SM/HM transmitters and SR/Venue receivers you've mentioned would be most unsuitable for your application, as their digitally assisted analog transmission system achieves its audio excellence through very clever, self-analysing, multi-band companding, ...thereby most elegantly [and expensively] defeating any analysis of spectrum ! )
If, however, all you're after is a highly mobile "feedback finder" and "venue tamer" for re-enforcement applications, then I reckon the XD-V35L may well pass muster, as its high-pass filter is specifically designed to leave the vital vocal frequencies (and those above) totally unaffected.
So you'll find that not only are the room nodes that give most problems in these situations generally above the V35L filter's cut-off, but also it's almost axiomatic that the mics which yield subsonic "whoomp" problems will be automatically subject to high-pass filtering in the house system anyway.
Not only that, the sources that provide real bass for music are very often D.I.'d and in any case, any deep "whoomp" problems from such sources that may be miked are very easy to identify and correct by ear.
As for range, I feel that the external "rubber duckie" antennae of the 55's are likely to yield significantly more usable range than those built into the 35's, if only by virtue of easier re-positioning, regardless of the published specifications' claimed deficit of a mere 15 feet.
Currently Being ModeratedSep 13, 2012 10:39 PM (in response to RonMarton)Re: XD-V35 High pass filter
I want full spectrum on my analyzer, mostly to be able to look at the phase between the subs and mains. For rta purposes as well, I find it can be difficult to determine the exact sub frequencies. Also to see the sub/mains ratio.
Another thing is that it's great to have the measurment mic wireless because in a venue with a lot of people running a round theres a big risk of having someone trip on your cable and the mic goes down the ground...
Lectrosonics tm 400 is specifically designed for measurment purposes and does not compand, but I cant't justifie the price. Normal uhf systems as you say is not suitable because of the companding. I actually found a test that showed the line6 to be a bit more transparent!
I will probably use it with a earthworks m30bx because it dont need phantom power. That mic goes from 9Hz, even tough that is overkill but to be able to see frequencies from 20Hz is wanted.
So to conclude, the high pass in the 35 can probably not be switched off. So i either have to go with the 55 or 75.
Excuse my writing, It's not my native language.
First off, my friend...
Your writing is better than many native English-speakers can manage! If you don't believe me, just browse around these discussions.
Second. I've been very happy with the results I've had from Lectrosonics since the late 1980's, even more so since the release of their gunmetal SM and HM range and I thank you very much for alerting me to their TM system.
(Like you, however, there's no way I can afford to buy them for myself, ...but I'm very lucky to still be able to use their beltpacks and handmic "butt plugs" at various times when I work in various better-funded set-ups.)
To the matter at hand: ...as you say, the XD-V55 is definitely the minimum you'll need to pass the bandwidth required for the evaluation of crossover, intermodulation, standing-wave and diffraction artefacts.
Incidentally, while the M30's 9Hz-30kHz response may not seem to be needed when considering fundamental frequencies, it is nevertheless nice to know that upper and lower harmonics won't be attenuated when trying for full spectrum analysis.
I guess the only decision left is whether to spend the price of a second Earthworks M30 for the additional antenna-splitting and other features of the (one-third more expensive) XD-V75.
It seems to me the main deciding factors would be whether or not you
- May also use it as a conventional wireless system and/or
- May find antenna distribution handy
...either now, or in the future.
It seems to me that if either of the above applies, the extra money would be a good investment.
Either way, you may find my review of Gator's relatively cheap GM-1WEVA case handy when thinking about how you'll be carrying your M30 measurement kit.
and you'll also be needing something like this:
Currently Being ModeratedSep 14, 2012 2:26 AM (in response to RonMarton)Re: XD-V35 High pass filter
Your'e too kind :) I' ll probably go with the 75 to be a bit more future proof ( in case I want to use it for the regular mic). I shall check out that case. I can't remember where but I found a test where they thested the line6 vs lectrosonics and the line6 did actually meassure better!
Just for your information...
I am not associated with Line 6 (or any other company), nor do I have particular loyalties to any companies. (Click on the pink avatar at left for details of my location equipment.)
Knowing that may help you to judge the value of my opinion, which is that my XD-V70/75 equipment (which I actually bought with my hard-earned cash) gives me the most transparent wireless transmission that I have ever experienced.
As do the Lectrosonics SM/HM/Venue/SR and AKG DMS 70/700 systems...
As much as I love the vocal sound from AKG's D5 capsule, configuring either of the brands above to approach (but not equal) the level of features and flexibility built into Line 6's XD-V75 costs between three and FIVE times as much.
The Shure PGX, while promising much, sounds really nasty to my old ears.
I hope this helps.