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[Joseph D. Macry]

I've been considering using Listen Technology's assistive listening components to do point-to-point audio. Specifically purpose is to send a mix from a portable audio cart into an installed system in a Gym. There are no mic/line jacks so trying a wireless solution that is cheaper than Shure P9T-to-UR4+.

The oddity: Listen Tech's LT-800 transmitter and LR-100 receiver are available in 72MHz and 216MHz varieties. I assumed the 216MHz would have better specs. BUT: frequency response specs say
216 MHz - 60Hz to 10KHz (+/-3dB)
72 MHz - 50Hz to 15KHz (+/-3dB)

Whadya make of that?

Link to transmitter: http://www.listentech.com/shop/product/stationary-rf-transmitter-72mhz/

[Scott Helmke]

Neither one is going to sound especially hifi - emphasis is on low cost and reliability, not sound quality. 

[John Sulek]

I've been considering using Listen Technology's assistive listening components to do point-to-point audio. Specifically purpose is to send a mix from a portable audio cart into an installed system in a Gym. There are no mic/line jacks so trying a wireless solution that is cheaper than Shure P9T-to-UR4+.

The oddity: Listen Tech's LT-800 transmitter and LR-100 receiver are available in 72MHz and 216MHz varieties. I assumed the 216MHz would have better specs. BUT: frequency response specs say
216 MHz - 60Hz to 10KHz (+/-3dB)
72 MHz - 50Hz to 15KHz (+/-3dB)

Whadya make of that?

Link to transmitter: http://www.listentech.com/shop/product/stationary-rf-transmitter-72mhz/

more deviation allowed in the fm band would be first guess

[Tim McCulloch]

I'd contact Listen and ask them.  As to any technical reasons, I'll leave that to Henry or the manufacturer but I'd guess that for listening assistance bottom and top octaves can be sacrificial as they don't significantly contribute to intelligibility.

[David Sturzenbecher]

I am pretty sure what you are trying to do is also illegal. Those frequency bands are specially reserved for ADA hearing assistance. Proceed with caution.


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[Joseph D. Macry]

I am pretty sure what you are trying to do is also illegal. Those frequency bands are specially reserved for ADA hearing assistance. Proceed with caution.


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Interesting thought, David. Must look into that.

[Tim McCulloch]

I am pretty sure what you are trying to do is also illegal. Those frequency bands are specially reserved for ADA hearing assistance. Proceed with caution.


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Have receivers available for the intended use. So long as signal distributed contains the full program  I don't think the subsequent additional use infringes on the assistance.

[Cailen Waddell]

Have receivers available for the intended use. So long as signal distributed contains the full program  I don't think the subsequent additional use infringes on the assistance.

We use our assisted listening receivers with a small powered speaker when odd rooms become dressing or production offices at our PAC.  That said, there are laws about the minimum percentage of receivers required to be available vs number of seats - if you pull receivers in a system and don't have the minimum available you could open yourself to liability (unlikely) if you ran out of receivers. 


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[Keith Broughton]

I've been considering using Listen Technology's assistive listening components to do point-to-point audio. Specifically purpose is to send a mix from a portable audio cart into an installed system in a Gym. There are no mic/line jacks so trying a wireless solution that is cheaper than Shure P9T-to-UR4+.

The oddity: Listen Tech's LT-800 transmitter and LR-100 receiver are available in 72MHz and 216MHz varieties. I assumed the 216MHz would have better specs. BUT: frequency response specs say
216 MHz - 60Hz to 10KHz (+/-3dB)
72 MHz - 50Hz to 15KHz (+/-3dB)

Whadya make of that?

Link to transmitter: http://www.listentech.com/shop/product/stationary-rf-transmitter-72mhz/

You are sending the sound to a GYM  ...what difference are those relatively minor differences going to really make?

[Henry Cohen]

I've been considering using Listen Technology's assistive listening components to do point-to-point audio. Specifically purpose is to send a mix from a portable audio cart into an installed system in a Gym. There are no mic/line jacks so trying a wireless solution that is cheaper than Shure P9T-to-UR4+.

The oddity: Listen Tech's LT-800 transmitter and LR-100 receiver are available in 72MHz and 216MHz varieties. I assumed the 216MHz would have better specs. BUT: frequency response specs say
216 MHz - 60Hz to 10KHz (+/-3dB)
72 MHz - 50Hz to 15KHz (+/-3dB)

Whadya make of that?

It's a result of FCC rules regarding occupied channel bandwidth limits. More band width for deviation is (was, actually, as only legacy certified products can still be manufactured in 72MHz IIRC) available for 72MHz systems compared to newer 216MHz systems. Since these assisted listening products are manufactured under the permitted use rules for "auditory assistance communications" ( 47CFR Part 95.1009(a) ), it's only the voice frequency range that's of interest, thus the narrower frequency band.

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