Hello,

It looks like the mic input has an senitivity of 15 mV:
https://www.whybuynew.co.uk/consumer-hifi/hifi-separates/qtx-kad-2-digital-stereo-amplifier.htm
You can short the input using a 6.3 mm plug with the pins connected together.
When the output is silent when the input is shorted, then the noise comes from the mic and cables.

Bertus

 

Hiya this amplifier has two 6.5 mm jack socket's on it and input's for a CD player 'dvd player 'aux and line ( don't know what that is ) I thought
These type the of amplifier's had a pre amp built in ??..thank's keith

hi K,
These type of inputs 'aux and line' are for high level signals not low level from a mic.
If you have a spare 6.5mm plug, unscrew the plastic sleeve and link the three internal connections together.
Now when you plug that into the amp it effectively shorts out that input, increase the volume and check for the hiss.

E

 

Hello,

It looks like the mic input has an senitivity of 15 mV:
https://www.whybuynew.co.uk/consumer-hifi/hifi-separates/qtx-kad-2-digital-stereo-amplifier.htm
You can short the input using a 6.3 mm plug with the pins connected together.
When the output is silent when the input is shorted, then the noise comes from the mic and cables.

Bertus

Thanks I don't have a cable to short it out but I do have one of those reducing adapter's so maybe I can sort some thing out with that . It won't be till later today or May tomorrow I'll let you know .thanks Keith.

 

Hello,

It looks like the mic input has an senitivity of 15 mV:
https://www.whybuynew.co.uk/consumer-hifi/hifi-separates/qtx-kad-2-digital-stereo-amplifier.htm
You can short the input using a 6.3 mm plug with the pins connected together.
When the output is silent when the input is shorted, then the noise comes from the mic and cables.

Bertus

Hiya so if it is the mic . I struggled to get a decent outdoor microphone so I would rather if it was the case swop the amp
What amp should I look for ??. Thanks for your time Keith.

 

hi K,
These type of inputs 'aux and line' are for high level signals not low level from a mic.
If you have a spare 6.5mm plug, unscrew the plastic sleeve and link the three internal connections together.
Now when you plug that into the amp it effectively shorts out that input, increase the volume and check for the hiss.

E

Hiya so if the hiss goes is it the mic ??. I can't see it being the wiring as I have double checked it swooped chargers changed wiring
I think it is the microphone or amp not being compatible thanks Keith .

 

Hello,

It looks like the mic input has an senitivity of 15 mV:
https://www.whybuynew.co.uk/consumer-hifi/hifi-separates/qtx-kad-2-digital-stereo-amplifier.htm
You can short the input using a 6.3 mm plug with the pins connected together.
When the output is silent when the input is shorted, then the noise comes from the mic and cables.

Bertus

Hiya so if the mic has a senitivity of 15 mV what amp would best suit it with 6.3 microphone jack .
Thanks for replying Keith .

 

Hello,

Looking at the microphone, it has a buildin amplifier:
https://www.microseven.com/product/IP-Cameras-M7WP-MIC.html
It has a very high output level of 2.5 Voltspp.
The KAD-2 has a line input sensitivity of 380 mVpp.
To connect the mic to the kad, you will need an attenuator of about 7 times, to connect it to the line input.

Bertus

 

Hello,

Looking at the microphone, it has a buildin amplifier:
https://www.microseven.com/product/IP-Cameras-M7WP-MIC.html
It has a very high output level of 2.5 Voltspp.
The KAD-2 has a line input sensitivity of 380 mVpp.
To connect the mic to the kad, you will need an attenuator of about 7 times, to connect it to the line input.

Bertus

Thanks Bertus so what do I Google and what does this attenuator do ??. Keith

 

Hello,

You could try the following circuit:



The attenuator will bring the signal level down from 2.5 Vpp from the mic to about 380 mVpp needed for the amplifier

Bertus

 

Hello,

You could try the following circuit:

View attachment 136896

The attenuator will bring the signal level down from 2.5 Vpp from the mic to about 380 mVpp needed for the amplifier

Bertus

Hiya Bertus thanks for your help I have been looking on the web trying to learn a little bit about this and have looked at a
Di box would you Google it for me as I am not sure it has two 6.3 Jack's so I could just plug my mic into one side buy another cable to link the DI box to the amp on the other side . The DI box is IMG Stage line DIB-100 thanks Keith

 

Your mic does not have a 6.3mm plug like a normal mic has because it has a built in preamp. Instead it has an RCA plug so that it can plug in and work with a line input, not a mic input on an amplifier.

 

Hello,

As @Audioguru said, the mic has an amplifier build in and must be connected using the RCA (tulip) connectors.



Bertus

 

Your mic does not have a 6.3mm plug like a normal mic has because it has a built in preamp. Instead it has an RCA plug so that it can plug in and work with a line input, not a mic input on an amplifier.

Hi'ya Bertus well you're right that's how it started out but like I have said with the background noise and
not that good with electronics I swopped cables 'chargers ' etc and with the KAD 2 haveing a 6.3 mic input I went and swopped the cable and got a cable with a male RCA one end and a 6.3 jack on the other to go from the mic to amp .thanks keith

 

Hello,

As @Audioguru said, the mic has an amplifier build in and must be connected using the RCA (tulip) connectors.

View attachment 136937

Bertus

Hello,

As @Audioguru said, the mic has an amplifier build in and must be connected using the RCA (tulip) connectors.

View attachment 136937

Bertus[/
Hi'ya well if I have to connect it to the line RCA terminals . The cable coming into the house is the
6.3 microphone cable I wonder if there is a adapter that will fit on the 6.3 jack with two RCA connectors on thanks Keith

Hello,

As @Audioguru said, the mic has an amplifier build in and must be connected using the RCA (tulip) connectors.

View attachment 136937

Bertus

 

Hello,

As @Audioguru said, the mic has an amplifier build in and must be connected using the RCA (tulip) connectors.

View attachment 136937

Bertus

Hiya thanks for your help I have connected up to the line in using the tulip connectors as suggested and 90% of the background noise has gone so I can
live with that . The only thing is I can't amplifie the sound any ideas thanks Keith

 

Your mic does not have a 6.3mm plug like a normal mic has because it has a built in preamp. Instead it has an RCA plug so that it can plug in and work with a line input, not a mic input on an amplifier.

Hiya thanks for your help .I have connected to the line input and it has done the job but i can't increase the volume
is there anything else I can do . Thanks Keith .

 

Hello,

Does the KAD give any sound?
Is the selector switch set in line position?
Then you should be able to set the gain with the main volume knob.
Is the total volume to low?
Then you could adapt the attenuator to adjust this.

Bertus

 

Hello,

Does the KAD give any sound?
Is the selector switch set in line position?
Then you should be able to set the gain with the main volume knob.
Is the total volume to low?
Then you could adapt the attenuator to adjust this.

Bertus

Hiya Bertus I haven't used a attenuator yet .Do I still need one ??. Will it increase the volume ??. Yes I have switched it to the line and
turned the volume right up but I can only just hear it . What attenuator would I look for .thanks Keith

 

An attenuator attenuates the signal. Lookup the word "attenuate" in a dictionary.

 

An attenuator attenuates the signal. Lookup the word "attenuate" in a dictionary.

Thanks I will Google it . I'm going to order some attenuator's see what the difference is thanks for all the help you've given me Keith .