I recently acquired a Trace Elliot 1225v (200W) combo, based on the Series 6 AH200 & GP12, but with an added valve in the pre-amp stage. As standard this comes with 2 x 10" and 2 x 5" speakers.
The mid-range speakers have been removed. I want to re-instate them and was looking for some help to do so. I've been trying to work out how it was originally wired and my (not very educated) guess is as follows.
The "head" part of the combo has a stereo jack to connect the cabinet. The jack plug from the cabinet is now mono, but has three wires, red, orange and black. The red and black wires connect to the 10" 100W speakers (16 ohm) in parallel. The orange wire has been joined to the red wire on the jack plug but is disconnected in the cabinet.
In the head part there is a hole labelled "high frequency volume" - presumably there was once an L Pad there (now removed). Three wires have been cut off the speaker jack socket - one connected to red (and therefore the power amp out/10" speakers), one to orange (what would have been the mid-range speakers) and one to ground - that ties in with the expected L Pad wiring, I think.
There is no crossover board, nor space for one in the head chassis and there is nothing in the
cabinet. I know only a little about speaker configurations, but it looks to me as if the cab was
perhaps wired like a 4 x 10", with 2 x 10" and 2 x 5" speakers all in parallel, but with the
5" speakers attenuated by the L Pad. I suppose there may possibly have been a capacitor in series with the wiring to the L Pad to create a simple high pass filter, but that is only a guess.
The speaker sockets on the head are labelled "min load 4 ohms", which I guess might mean that the speakers in the cab would have been configured to be 4 ohms total, so the 5" speakers may have been 16 ohm as well.
Does anyone know if the above sounds vaguely in the right ball park?
I'm finding it hard to source low cost 16 ohm 5 inch speakers (actually more like 4 inch as the mounting holes are 119mm apart), with which to re-create the above (if it's right). However I can get some 4 ohm or 8 ohm speakers fairly cheaply that should fit.
I wondered if connecting the mid-range speakers in series would work, i.e. two 4 ohm speakers in series, in parallel with the two 10" speakers, which I think should give an overall impedance of 4 ohms, e.g. 16 ohms in parallel with 16 ohms in parallel with 8 ohms (4+4). That should also give the correct impedance for the 5" speakers to be controlled by an 8 ohm (which seems most common) L Pad.
Something like this:
TLDR; Can I add two 5" mid-range drivers to the "current configuration" of two 10" drivers of this combo amp as shown in the above diagram. Is there a better way that is still simple and cheap? Can I get away with a 50W L Pad or do I need 100W?
I'm not looking to spend much money; the combo cost very little and sounds great as it is, I just fancy a little project, but not looking for startling improvements to the sound, just can't help tinkering with these things and curious what difference it might make.
Any advice very gratefully received.
The mid-range speakers have been removed. I want to re-instate them and was looking for some help to do so. I've been trying to work out how it was originally wired and my (not very educated) guess is as follows.
The "head" part of the combo has a stereo jack to connect the cabinet. The jack plug from the cabinet is now mono, but has three wires, red, orange and black. The red and black wires connect to the 10" 100W speakers (16 ohm) in parallel. The orange wire has been joined to the red wire on the jack plug but is disconnected in the cabinet.
In the head part there is a hole labelled "high frequency volume" - presumably there was once an L Pad there (now removed). Three wires have been cut off the speaker jack socket - one connected to red (and therefore the power amp out/10" speakers), one to orange (what would have been the mid-range speakers) and one to ground - that ties in with the expected L Pad wiring, I think.
There is no crossover board, nor space for one in the head chassis and there is nothing in the
cabinet. I know only a little about speaker configurations, but it looks to me as if the cab was
perhaps wired like a 4 x 10", with 2 x 10" and 2 x 5" speakers all in parallel, but with the
5" speakers attenuated by the L Pad. I suppose there may possibly have been a capacitor in series with the wiring to the L Pad to create a simple high pass filter, but that is only a guess.
The speaker sockets on the head are labelled "min load 4 ohms", which I guess might mean that the speakers in the cab would have been configured to be 4 ohms total, so the 5" speakers may have been 16 ohm as well.
Does anyone know if the above sounds vaguely in the right ball park?
I'm finding it hard to source low cost 16 ohm 5 inch speakers (actually more like 4 inch as the mounting holes are 119mm apart), with which to re-create the above (if it's right). However I can get some 4 ohm or 8 ohm speakers fairly cheaply that should fit.
I wondered if connecting the mid-range speakers in series would work, i.e. two 4 ohm speakers in series, in parallel with the two 10" speakers, which I think should give an overall impedance of 4 ohms, e.g. 16 ohms in parallel with 16 ohms in parallel with 8 ohms (4+4). That should also give the correct impedance for the 5" speakers to be controlled by an 8 ohm (which seems most common) L Pad.
Something like this:
TLDR; Can I add two 5" mid-range drivers to the "current configuration" of two 10" drivers of this combo amp as shown in the above diagram. Is there a better way that is still simple and cheap? Can I get away with a 50W L Pad or do I need 100W?
I'm not looking to spend much money; the combo cost very little and sounds great as it is, I just fancy a little project, but not looking for startling improvements to the sound, just can't help tinkering with these things and curious what difference it might make.
Any advice very gratefully received.
