focus st170 sub

Author
Discussion

stewartcampbell

Original Poster:

202 posts

195 months

Tuesday 26th May 2015
quotequote all
Hi, the sub in my focus blew and i got another secondhand,(kenwood t10 0878 08)The original sub had just 1 voice coil but the kenwood has 2, i have just wired to one set of connectors but now it seems to be trying to play higher frequencys as well as the low so do i need to wire it differently ie http://a248.e.akamai.net/pix.crutchfield.com/ca/le... or http://a248.e.akamai.net/pix.crutchfield.com/ca/le...
problem is i dont know anything about the sub or the amp, the amp is the original option one and i cant find info on the sub, help.

stuart313

740 posts

112 months

Tuesday 26th May 2015
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Is there not a crossover dial on the sub where you can select the frequencies it can play.

stewartcampbell

Original Poster:

202 posts

195 months

Tuesday 26th May 2015
quotequote all
No, think a crossover is usually bought seperately but i could be wrong.

stuart313

740 posts

112 months

Tuesday 26th May 2015
quotequote all
How many ohms was the old sub and how many is the new sub, you may need to wire the new one in series or parallel to get the right ohms for the sub (like your diagrams). The sub must have a higher range speaker inside it as well as the bass. You are probably connected to the higher speaker.

The 4 ohm diagram is wired in parallel, if you wire it this way then you halve the resistance of the speaker, in this case it will become a 2 ohm speaker matching up with the amp. (4/2=2)

The 2 ohm diagram shows it wired in series, this way the impedance of the speakers is added together so you get a 4 ohm circuit. (2+2=4).

stewartcampbell

Original Poster:

202 posts

195 months

Tuesday 26th May 2015
quotequote all
Will need to get a shot of a multimeter to test the ohms of the old and new subs.

ZX10R NIN

27,490 posts

124 months

Wednesday 27th May 2015
quotequote all
You need to put one of these In Line on your RCA/Phono input to your amp this will give you greater control of your Frequencies.

http://www.ebay.co.uk/itm/Longmill-CX-001-Subwoofe...

stuart313

740 posts

112 months

Wednesday 27th May 2015
quotequote all
ZX10R NIN said:
You need to put one of these In Line on your RCA/Phono input to your amp this will give you greater control of your Frequencies.

http://www.ebay.co.uk/itm/Longmill-CX-001-Subwoofe...
Thats what I cant work out, does the sub have a phono input like an active home cinema sub would or is it just a big speaker(s) that just has a straight speaker input, like a passive sub would.

stewartcampbell

Original Poster:

202 posts

195 months

Wednesday 27th May 2015
quotequote all
stuart313 said:
Thats what I cant work out, does the sub have a phono input like an active home cinema sub would or is it just a big speaker(s) that just has a straight speaker input, like a passive sub would.
no phono input just straight connectors, old sub was the same but with just one voice coil so just one set of connectors.

stewartcampbell

Original Poster:

202 posts

195 months

Wednesday 27th May 2015
quotequote all
ZX10R NIN said:
You need to put one of these In Line on your RCA/Phono input to your amp this will give you greater control of your Frequencies.

http://www.ebay.co.uk/itm/Longmill-CX-001-Subwoofe...
How hard would this be to wire up, i see it needs a power feed, would this one be better http://www.ebay.co.uk/itm/Audiovox-Viper-Crossover...

ZX10R NIN

27,490 posts

124 months

Wednesday 27th May 2015
quotequote all
stewartcampbell said:
ZX10R NIN said:
You need to put one of these In Line on your RCA/Phono input to your amp this will give you greater control of your Frequencies.

http://www.ebay.co.uk/itm/Longmill-CX-001-Subwoofe...
How hard would this be to wire up, i see it needs a power feed, would this one be better http://www.ebay.co.uk/itm/Audiovox-Viper-Crossover...
The Phono that goes to the Sub Amp now goes into the Crossover then from the Crossover to the Amp, then you use the Power & Remote from the Amp to power it, then Earth it separately.

That's it, the one you're looking at is no good.

stewartcampbell

Original Poster:

202 posts

195 months

Thursday 9th July 2015
quotequote all
Ok was planning going down a different route with this now as i have an old kenwood amp with lp filter so how do i wire it, what goes where.I have 2 red wires 2 black wires 1 red and white 1 black and grey and 1 white and black, the amp is rca input, thanks.

stewartcampbell

Original Poster:

202 posts

195 months

Thursday 9th July 2015
quotequote all
Why is there 2 powers and 2 grounds and how do i split the sub + and - into the rca,s to the amp.