Jump to content

COS-11D SMQV transmitters gain issues

Laurence T

Recommended Posts

Hi all,


I just purchased 2 more COS11D mics, this time wired for my recently purchased lectrosoncis SMVQ transmitters. I chose the universal wiring option as I may need to use them with older lectro transmitters.


However I’m experiencing some issues with transmitter volume/sensitivity when attempting to set up the optimum gain structure. In order to ‘tickle’ the -10 led I have to have the transmitter gain at maximum (44) and shout very very loudly. In fact, relatively normal interview talking volume rarely hits the green of -10.


Is this because I should have perhaps opted for the servo wiring? Or some other issue?


I definitely do not have the red dot versions (unless something untoward has happened) so am confused. Any help would be greatly appreciated!

Link to comment
Share on other sites

Just to be clear, I didn’t wire these (I’m terrible at soldering!) - I bought them terminated for Lectro from the store. I guess I should just return them.



I have noticed TA5F - UNLE written onto both boxes, UNLE seems to correspond to the reduced sensitivity version serial on B&H. If i’m correct I think they may have sent my the incorrect microphones!

Link to comment
Share on other sites

Thanks Larry - that makes a lot of sense. 


Strange thing is when i google the Sanken model number with the UNLE suffix, it seems to mostly bring up he reduced sensitivity versions.


I can’t for the life of me think what else could be causing the low gain on the Tx. Really do have to shout in order to light up the -10 led and audio level is on 44!


On further research, the Sanken product codes for the different wiring seem to be as follows:


Lectro TA5F normal sensitivitiy: SAN-11DWNBKSMLE (is this the servo wiring?)


Lectro TA5F Reduced sensitivity: SAN-11DWRBKUNLE (The code on the mics I have been supplied)


Sennheiser LEMO normal sensitivity: SAN-11DANBSE


Sure TA4F normal sensitivity: SAN-11DANGYT4SH


Seems that I may have the red dot version?

Link to comment
Share on other sites

41 minutes ago, Eric Toline said:

Reduced sensitivity functions are built into the mic not the connector. The Sanken reduced output versions are 10db down from the regular versions regardless of what connector is attached.

Indeed, and even though my mic does not have the ‘red’ band - the model number written on the box does correspond to Sankens  reduced sensitivity model number as seen I this picture. I realise thanks to Larry that UNLE is universal lectrosoncis, but also I’ve noticed on the Internet that the code only appears on Sanken models with reduced sensitivity. 





Link to comment
Share on other sites

I had exposed the connecter and have found the following. Could anyone perhaps tell me if this is correct? 


Pin 1 -white (audio?) to a resistor, and another wire I think is the shield


pin 2 - 4 jump


pin 3 - black (bias?)


this seems to match up with fig 5 in lectrosonics wiring diagrams.



Link to comment
Share on other sites

5 minutes ago, jason porter said:

That is the correct universal wiring.

Thanks, it does seem to be. This is so odd.



So I have the lav in mid chest position, and when speaking at normal conversation volume, with a Tx audio level of 40(!) I only occasionally light the -20 led green.  


When I shout I’ll light the -10 green. I really have to go crazy to get them to go red and just hit the limiter (which is fulll modulation and optimum gain structure correct?)


Having the Tx audio level at anything less doesn’t even light the LEDs at all.


Am I missing something on my Tx?



Link to comment
Share on other sites

Something is not right. I would send it back and get them re-wired or replaced by the store.

I usually keep my SMQVs with COS11D wired universal Lectro at level 16. That gives me enough gain for pretty much anything. If someone is soft spoken, I may up it to 18-20.

For reference, running the same SMQVs with DPA4061, I usually have the level anywhere between 30 to 36 for similar output.

Link to comment
Share on other sites

Thank you for all your help guys, really appreciate it.

Just now, ryanpeds said:

And that's why I normally don't buy through B&H

It actually wasn’t from B&H!

Am I right in thinking that if I remove the resistor completely, and attach the white wire straight to pin 5, it will be the correct (and non universal) servo bias wiring?

Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.

Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

  • Create New...