Bargains on ebay?

[spendorman]

RB,

Forgot to ask you...Are the early Ditton 15s 4 ohms?

Several early pairs here, says on the back:

"4-8 Ohms"

[southall-1998]

Several early pairs here, says on the back:

"4-8 Ohms"

But are they a ''pure'' 4 ohm load?

[Rare Bird]

Pure 4 Ohm load! whats that suppose to mean?

[southall-1998]

Never Mind!

[Ali Tait]

No speaker can be like a resister. The impedance varies with frequency.

[Rare Bird]

Wow they are rare

http://www.ebay.co.uk/itm/Celestion-...item35c58e6ef9

[walpurgis]

But are they a ''pure'' 4 ohm load?

Hi Shane,

If you look at the impedance graph for a loudspeaker, you'll see that the measured impedance across the frequency range will swing up and down. By how much and where in the range this happens depends on the speaker design. Some speakers have wild swings in impedance, others are less radical. Quoted impedance ratings are very arbitrary and just give an average.

The Celestion Ditton 15 has, as quoted, a 4 to 8 ohm rating, you should just regard this a 6ohm speaker, although, I've measured the DC resistance of the driver coils in the past and found them to read around 6 ohms, meaning that under dynamic/driven conditions they are to all intents and purposes 8 ohm speakers.

[walpurgis]

Mystery Cambridge R50 speakers, They appear to have an EMI bass driver, two midrange units and an unidentifiable tweeter. Are these an early version or have they been messed about? If they have, the buyer may end up very disappointed. I've not seen a pair like this before.

http://www.ebay.co.uk/itm/cambridge-...item19da0a05d6

[southall-1998]

Pair of Lowther DX2 drivers in home built cabs. Based in London.

http://www.ebay.co.uk/itm/2-x-1970s-...item232912328a

[walpurgis]

Decent looking pair of KEF B200 SP1012 drivers at a very reasonable £40.

http://www.ebay.co.uk/itm/KEF-B200-S...item257bd7ddcc