Help needed Kit 88

[Gennymensch]

Hi,

I have an old Y 2000 Kit 88 which I have been operating more or less constantly since then.

Now I have planned to add a "pre-out" for a subwoofer connection into the device.

Can some one help me by giving advice how to do it ?

Many thanks in advance,

K.

[John Caswell]

Hi K,
I assume that this is a WAD Kit/Kat88 and not a WD 88VA but the same rules apply either way.
If the amplifier is an integrated version with a tape output then you can use this to feed the sub woofer amplifier directly as most sub woofer amplifiers have the necessary frequency contouring circuits built in.
If it is purely an amplifier then you can buy RCA "Y" connectors, sometimes called "two into one" which have two phono sockets and one phono plug (CPC in the UK sell them). The signal goes into one phono socket, the feed to the sub woofer into the other phono socket and the plug into your amplifier. That's it! You will obviously need two of these for stereo.

John

[Richard]

Originally Posted by John Caswell

Hi K,
I assume that this is a WAD Kit/Kat88 and not a WD 88VA but the same rules apply either way.
If the amplifier is an integrated version with a tape output then you can use this to feed the sub woofer amplifier directly as most sub woofer amplifiers have the necessary frequency contouring circuits built in.
If it is purely an amplifier then you can buy RCA "Y" connectors, sometimes called "two into one" which have two phono sockets and one phono plug (CPC in the UK sell them). The signal goes into one phono socket, the feed to the sub woofer into the other phono socket and the plug into your amplifier. That's it! You will obviously need two of these for stereo.

John

Hi John, welcome K,

John, I didn't wire my tape sockets and switch up, but looking at Kit88 Tape Out it seems that it wouldn't be controlled by the vol control and would give the full level out of any source selected.

If so there may be 2 other options,

1) if the sub has a high level input it can be used for connecting to the Kit88 speaker output sockets along with the speaker cables

2) if the sub's line input is fairly high impedance (>20K) it should be ok connected to the Kit88 signal input tags R GND L on the pcb. This would give a line level connection after the volume control.
As John says you could then use an un-used pair of RCA sockets such as the Tape Out ones on the back panel as sub connectors.

[Gennymensch]

Thanks John and Richard !

Yes it is a WAD Kit 88, and yes, I would prefer the Option for volume control.

So, your advice is to go directly from the volume pot into the subwoofer, no additional voltage divider (I hope this is the correct expression - I mean 2 resistors in series and the output between them) needed ?

Thanks again !

K.

[Richard]

Hi K,

As Kit88 uses a passive "pre" section the best/easiest way may depend on one or two things;

Is you Kit88 wired for all inputs including Tape In/Out and what is the volume pot is it the supplied 100k or a 47k?

What is your sub make/model?

How far away from Kit will the sub be placed?

[Gennymensch]

Hi Richard,

I dont have the sub yet, I will by an used one and basing on the opportunity I can´t be sure wether it has rca and/or loudspeeker inputs. It will be placed max. 2 mtrs away from the amp.

Regarding the Kit, I have done some modifications with it (changing parts, but keeping the original values, except the feed back which I reduced). The pot is a DacT CT2 stepped attenuator and has 100k. The amp is currently not wired for Tape in/out.