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Hello Birzy, Yes it is compatible. I used exactly this combination last week. Go well, Ian

Well said, Sheriton. I was composing a reply but you have said all I was thinking about. Vivi, you might find it helpful to read the Pilot's Manual (User instructions) for the Line6 receiver. On page 13 it reads Connecting the XD-V75 receiver The receiver features a balanced XLR and unbalanced (tip-sleeve) quarter-inch connector. To connect to a mixing board or powered mixer, use a microphone cable between the receiver output and the mixer’s mic-level input – in the same way as you would connect a wired microphone. In its [NORMAL (+0 dB)] setting, the output of the XD-V75 receiver is virtually identical to that of the microphone on the transmitter (and the microphone models on the THH12 handheld transmitter emulate the output levels of the particular microphones they model). If desired, the output can be adjusted in 1-dB steps from -18 dB to +12 dB via [SELECT FUNCTION: OUTPUT ADJUST]; see Audio Output and Filter Adjustments for details. To connect to an instrument amplifier or other audio equipment with a quarter-inch connector such as a signal processor or effects unit, use a quarter-inch to quarter-inch instrument cable. The output level adjustment also affects this connector. Note: Do not use TRS balanced cable to connect to unbalanced output. The ring of the TRS connection on the ¼” out is a digital communication line used to talk with other Line6 wireless products. Connecting a TRS in this manner may create some digital noise when connected to a balanced audio input on a mixing console. Only an unbalanced ¼” inch cable is recommended for this audio output usage. This explains the background to some of Sheriton's advice.

Hi Vivi, I am not sure about how you are using the receiver. It provides two outputs one at "microphone level" (weak signal intended to feed into a pre-amplifier) - this is the XLR socket on the back of the receiver (which has three pins). The other output comes from the 1/4" socket - that is "line level" appropriate for feeding into an amplifier. It is about 10 times the strength of the microphone signal. So the next question is what are you connecting it into? I use mine with a mixer and amplifier and there is plenty of signal. I don't need to increase the output level of the receiver. Ian

On your first question, I understand that yes it is a true diversity system. See this white paper: https://www.google.co.nz/url?sa=t&rct=j&q=&esrc=s&source=web&cd=&cad=rja&uact=8&ved=2ahUKEwii2qDWwojvAhUMfisKHaroBHQQFjAAegQIARAD&url=https%3A%2F%2Fline6.com%2Fmedia%2Fpdf%2FLine%206%20Wireless%20microphones%20Whitepaper.pdf&usg=AOvVaw3LPYH988D8g9fQoCITZWS3 On your second question about directional antennae, I have no experience.

My understanding is that the 75 has a greater set of features than the 70. From memory a 70 transmitter can work with a 75 receiver, but the 75 transmitter may try to use channels the 70 receiver does not have. You can of course specify channels and avoid using unsupported ones at the receiver. I have 3 radio transmitter/receiver sets which are XD-V35, XD-V70 & XD-V75. I have used all combinations of mics with receivers. Quoting from the website: “ XD-V systems enable professional bands or church and theatrical productions to use up to 14 systems simultaneously. Relay® G30, G50, G55 and XD-V35, XD-V55 and XD-V75 systems share the same technology, so it’s easy to combine handhelds, lavaliers, headsets and instruments within the same system—with the same incredible performance.* And since all share the same technology, mixing and matching is easy. *Compatible units must be running same RF mode. ( https://line6.com/wireless-microphone-system/design#mix ) From the XD-V75 pilot manual available online under Support: Compatibility With other line 6 wireless devices The XD-V75 utilizes our latest digital wireless transmission method, and is fully channel compatible with the XD-V35, as well as Relay™ G30, Relay™ G50, and Relay™ G90 models that have Version 2 software running RF2 mode. Multiple units of any of these models can be mixed used within the same location as long as each is on a unique channel and no more than 14 are used simultaneously. The XD-V75 receiver can also automatically receive transmissions from the previous generation of Line 6 wireless products, which include the XD-V30, XD-V70, and Relay™ G30, Relay™ G50, and Relay™ G90 models with Version software, now referred to as RF1 mode. However, it is not recommended to mix usage of the RF1 and RF2 modes within the same location due to the channel frequencies in each system not being compatible. If an XD-V75 unit is being added to a setup that already includes any devices running in RF1 mode, the XD-V75 can be used to update the older devices to run RF2 mode by using an internet-connected computer attached to the XD-V75’s USB port. See the Firmware Updating Procedure section for more information. Alternatively, the XD-V75 transmitters can be setup to operate in RF1 mode if it is necessary to use the transmitters with older Line 6 receivers. To set the THH12 or TBP12 transmitters into the RF1 mode, enter Setup mode to display the current channel, then while holding down the SELECT button press and release the ON/MUTE button on the THH12 or VALUE button on the TBP12. The display will briefly show [XD-V75 RF1] or [XD-V75 RF2] to indicate whether it is operating in the old or new mode, respectively. This setting is retained when powering off, so as a reminder the display will also show this indication [RF1 or RF2] each time power is turned on. The XD-V75 receiver will display a [To] on the far right of the display to indicate while communicating with a RF1 software transmitter. So the answer is yes you can mix and match. You may want to do a firmware upgrade or limit the system to RF1 setting. Trust that helps. Ian

Thanks, that's great.

I have an XD-V75 body pack transmitter. The flexible plastic across the bottom around the switches and the plastic on the battery cover are peeling off. What sort of adhesive should I use to reattach them. Or if that is not known, what sort of plastic is it? Thanks, Ian