When I get the new tweeters and caps etc. I can set one speaker with the new tweeter and one with the old and do a subjective test. 👍.
Phil
Phil
I think I may have misread one of the resistors. I wrote down 7 Ohms for some reason but I rechecked today and they both come out at 5.4. The markings on one show 4R7 which I now understand means 4.7 Ohms.
So incorrectly ordered 6.8 Ohms from Falcon so I will have to pop to Maplin where they have 4.7 Ohm ceramic resistors , 5W , 5%, 350V made by Switch. Will they be ok as Falcon are £15 min order?
Cheers
So incorrectly ordered 6.8 Ohms from Falcon so I will have to pop to Maplin where they have 4.7 Ohm ceramic resistors , 5W , 5%, 350V made by Switch. Will they be ok as Falcon are £15 min order?
Cheers
They will be fine for initial test and maybe another thirty years as long as you don't drive them at high power all the time.
Additionally, you may or may not need some other values? Especially if the new tweeters come across as a bit hot, so its handy to have a local source of supplies
Additionally, you may or may not need some other values? Especially if the new tweeters come across as a bit hot, so its handy to have a local source of supplies
Thanks . I’ll get them and rebuild the XO and re wire them when the tweeters come next week I’ll do a test with one new one and the one old one. Be interesting.
Cheers
Phil
Cheers
Phil
Ok so ordered a couple of 4.7 ohm resistors from Wilmslow plus a couple ranging either side. I see the new tweeter starts at a lower frequency than the old H107 . If I need to change the crossover to allow more of the tweeter to work lower down do I reduce the resistor or increase it? Or would I need to change more on the board? Like the cap as well?
I’m itching to get soldering …….
Cheers
Phil
I’m itching to get soldering …….
Cheers
Phil
This is a rough approximation to your Xover, I think this is what you have.
Consequently to lower the Xover point for the tweeter go up in the capacitor value one E12 value step at a time.
I would suggest not doing this as its a fairly large value already and we do not know how you new tweeter is going to react. If you cannot get a reasonable sound then consider this as a final option. If you had some way of measuring these things its a lot easier.
To attenuate you can either increase the series resistor to the tweeter, or decrease the resistor in parallel with it. Only try one component change at a time and listen with differing music types so that you get a balanced sound.
Consequently to lower the Xover point for the tweeter go up in the capacitor value one E12 value step at a time.
I would suggest not doing this as its a fairly large value already and we do not know how you new tweeter is going to react. If you cannot get a reasonable sound then consider this as a final option. If you had some way of measuring these things its a lot easier.
To attenuate you can either increase the series resistor to the tweeter, or decrease the resistor in parallel with it. Only try one component change at a time and listen with differing music types so that you get a balanced sound.
Attachments
Thank you Raymond. I will have to wait for the tweeters to arrive to try this all out….
I’ll get a start on the crossovers and wiring and cleaning the cabinets and woofers.
Plenty to keep me busy.. 😁
Thanks again 👍
I’ll get a start on the crossovers and wiring and cleaning the cabinets and woofers.
Plenty to keep me busy.. 😁
Thanks again 👍
So just cleaning up the cabinets with wire wool and then going to apply the Danish Oil. Spray the front board black.
Clean off the oxidation from the magnesium frame on the woofers.
New Caps and resistors in crossovers next.
Then start assembling them. Will try the remaining old tweeter with one of the new ones to compare. I’ll get the missus to listen too as I have hearing aids….!
Clean off the oxidation from the magnesium frame on the woofers.
New Caps and resistors in crossovers next.
Then start assembling them. Will try the remaining old tweeter with one of the new ones to compare. I’ll get the missus to listen too as I have hearing aids….!
2 coats of Danish oil so far. Looking pretty good. Another couple of coats needed yet. I’ll move onto the crossovers shortly 👍
Hi Dave. I started to clean off the oxidation and they come up fine. Just need to make sure i don’t leave behind any dusty bits To clog up.
Phil
Phil
Hi guys. Just to let you know I’ve had to break off the refurb for a short while. I’m having chemo at the moment and it’s knocking me out. Plus I’ve been trying to get on with a little decorating..
I will be back. 👍
I will be back. 👍
