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Multi-Way Conventional loudspeakers with crossovers

Celestion 7 (original, not MKII) crossover
Celestion 7 (original, not MKII) crossover
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Old 20th February 2007, 12:25 PM   #1
markiemrboo is offline markiemrboo  United Kingdom
diyAudio Member
Join Date: Mar 2006
Location: Great Yarmouth, UK
Default Celestion 7 (original, not MKII) crossover


I am not sure if it's possible to do anything with these, given I have absolutely no data on the drivers and no real speaker measurement tools etc, but I thought I would ask anyway.

I have a set of Celestion 7 speakers. They are the 'original' models and not the ported MKII's (from what I gather this is the main difference). Not the best I know, but it is what I have to make do with... for now. They seem to have a certain harshness, particularly on female vocals. I can't quite explain what it is. It's quite... edgy I suppose. Sort of... a ringing noise. It seems like she is (in this case 'Hungry Lucy', 'To Kill A King'.. particularly the chorus) screeching / shouting, at points, at what I would consider 'normal' listening levels. I can't seem to tame it with an EQ (which is flat except 63Hz and 31Hz, which I find need boosting a bit for these speakers).

The speakers have a metal domed tweeter (by metal domed I mean it is silver, I dont know the actual material) and a 6.5" plasticy feeling woofer. I was just wondering if adjusting the crossover might do anything to tame this harshness? Perhaps it is just 'cheap' drivers and I can't really do anything about it?

I have drawn the current crossover, but I don't know the values of the inductors, sadly. The drivers are unmarked, so I don't know anything about them other than the tweeter is 6.5R at DC (multimeter measurement is the best I can do) and the woofer is 7.8R.

From what I gather, without the resistors it would be a very basic 2nd order crossover. I'm not sure what the resistors are actually doing though, so maybe it's not. Is it possible to "improve" it without proper specs? The caps are electrolytics... and they must be at least 10 years old by now I should think. Perhaps just replacing these might do it some good?

Click the image to open in full size.

Any suggestions / advice would be greatly appreciated!

Maybe someone out there somewhere has noticed the same thing and managed to improve it... or maybe it's a lost cause
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Old 3rd November 2016, 01:48 AM   #2
hejaus is offline hejaus  Australia
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Join Date: Nov 2016
Default Celestion 7 (original, not MKII) crossover

A very late reply I know, but has anyone managed to gather any information about the drivers and crossovers of the celestion models from this era (1 through to 15).

I too have access to some of these tweeters and instead of the larger woofers on the 7 I have the 4" woofers from the 1. I would love to use them in a project.
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Old 7th November 2016, 10:39 PM   #3
hejaus is offline hejaus  Australia
diyAudio Member
Join Date: Nov 2016
Default Celestion 1 Schematic

For anyone interested here is the Celestion 1 Schematic.
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File Type: pdf CELESTION 1 SCHEMATIC.pdf (532.6 KB, 26 views)
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