Hi all,
I've built two of Ivan's speaker kits (IPL acoustics) and was about to buy a third when I found out that Ivan has retired. The kits were amazing. My £300 M3TLm kit (I made the boxes from mdf and veneered them) sound and look superb. I now want to build another pair.
I can source the drivers and make the boxes but I'm struggling with the crossover (the kit came with all the crossover bits and some great instructions).
The speakers are transmission line, use hivi drivers (ribbon tweeter and woofer) and a biwired terminal. I've attached (I hope) the crossover diagram.
I'm not sure about the inductors.... can I buy a ready assembled crossover that would work OK? The speakers are two way. What size inductor would i need?
Assistance would be appreciated! Thanks.
I've built two of Ivan's speaker kits (IPL acoustics) and was about to buy a third when I found out that Ivan has retired. The kits were amazing. My £300 M3TLm kit (I made the boxes from mdf and veneered them) sound and look superb. I now want to build another pair.
I can source the drivers and make the boxes but I'm struggling with the crossover (the kit came with all the crossover bits and some great instructions).
The speakers are transmission line, use hivi drivers (ribbon tweeter and woofer) and a biwired terminal. I've attached (I hope) the crossover diagram.
I'm not sure about the inductors.... can I buy a ready assembled crossover that would work OK? The speakers are two way. What size inductor would i need?
Assistance would be appreciated! Thanks.
Attachments
Hi,
A generic off the shelf crossover probably won't be close enough in the frequency or shape of the rolloff to be worth it unfortunately.
Do you still have any of your original builds?
If so, would the crossovers be accessible eg by removing the drivers? I know this isn't always the case, especially with transmission line enclosures. If you can get at them though, you may be able to read off values from the components themselves.
FWIW, you might get a better response over in the "Multi-Way" subforum, I've pinged the admins to see if they'll consider moving your thread over there.
A generic off the shelf crossover probably won't be close enough in the frequency or shape of the rolloff to be worth it unfortunately.
Do you still have any of your original builds?
If so, would the crossovers be accessible eg by removing the drivers? I know this isn't always the case, especially with transmission line enclosures. If you can get at them though, you may be able to read off values from the components themselves.
FWIW, you might get a better response over in the "Multi-Way" subforum, I've pinged the admins to see if they'll consider moving your thread over there.
Hi David, thanks for the response. I do still have the speakers but the inductors don't have any values on them unfortunately. Thanks for the suggestion on subforum. Appreciate your assistance.
The IPL website still works. 3.2kHz crossover. You'd think that would be a 1.5mH ferrite bass coil and a 0.3 mH 0r 0.2 mH tweeter aircoil.
But better to borrow a good LCR multimeter from someone in the electrical trade. Fire alarm engineers and such.
You could get most of the stuff at Blue Aran near Southampton. Or Wilmslow Audio in Leicester.
https://www.bluearan.co.uk/index.ph...rs_!amp!_Components&subheadnew=Crossover_PCBs
https://www.wilmslowaudio.co.uk/crossover-pcb-452-p.asp
Ivan might still be responding to emails or phone calls too. Can only ask.
https://tubedistinctions.co.uk/a-day-at-ipl-acoustics/
Quite a nice idea to mount the components on the back of a large biwire mounting plate with hot glue. Don't know where you get them though.
Unless Ivan still has some stock.
But better to borrow a good LCR multimeter from someone in the electrical trade. Fire alarm engineers and such.
You could get most of the stuff at Blue Aran near Southampton. Or Wilmslow Audio in Leicester.
https://www.bluearan.co.uk/index.ph...rs_!amp!_Components&subheadnew=Crossover_PCBs
https://www.wilmslowaudio.co.uk/crossover-pcb-452-p.asp
Ivan might still be responding to emails or phone calls too. Can only ask.
https://tubedistinctions.co.uk/a-day-at-ipl-acoustics/
Quite a nice idea to mount the components on the back of a large biwire mounting plate with hot glue. Don't know where you get them though.
Unless Ivan still has some stock.
Thanks System7, that's really useful. I took the plunge and emailed Ivan. Hopefully get a response it will understand if not. I'm a bit reluctant to start pulling the speakers apart .... I'd be gutted if I busted anything. I'm quite happy to spend a bit of cash and have a play. Appreciate your time and assistance. Thank you.
A screw terminal block can be screwed to something and used as a base.. if assembly is your concern...
I would be very interested in any response you receive. I had been hoping to order from IPL when business was suspended, apparently at first due to a move to new premises, so I was somewhat disappointed when trading then ceased permanently.
I'd be happy if I could obtain parts list, instructions and plans/diagrams. For a fee of course!
Your diagram was kinda washed out, i fixed as bext i could and this is the map. Let me know if i have any values wrong.
dave
dave
dave
dave
Nice work, Planet10 aka dave!
It did cross my mind to use a stock Visaton HW 2/70 8 ohm 3kHz crossover here:
https://impactaudio.co.uk/products/visaton-hw-2-70-ng-8-ohm
But probably slightly inexact. Don't know till you try it. I had surprising success with off-the-shelf crossovers in my early career.
Naturally a certain amount of level adjust.
It did cross my mind to use a stock Visaton HW 2/70 8 ohm 3kHz crossover here:
https://impactaudio.co.uk/products/visaton-hw-2-70-ng-8-ohm
But probably slightly inexact. Don't know till you try it. I had surprising success with off-the-shelf crossovers in my early career.
Naturally a certain amount of level adjust.
Attachments
I too have built some IPL amazing speakers.. I have had them well over a year now but they still have the capability of causing goosebumps on well recorded material of any kind. You may struggle to get the same quality output as Ivan would match speakers to a closer tolerance than the "matched pairs" you can buy and even then would tweak the crossover to match the sets supplied in the kit.
I keep hoping someone would take over the business but that does not seem to have happened.. big loss to the DIY speaker market.
I hope Ivan can answer your questions..
I keep hoping someone would take over the business but that does not seem to have happened.. big loss to the DIY speaker market.
I hope Ivan can answer your questions..
I don't think Ivan is responding to anything on the site. I was lucky enough to get to build the S2tlm's to go with the avc-pro centre shortly before his retirement. Although the website landing page has no links the underlying pages are still there (Crossover Components). you will be able to find information about his component lists and cores used for his coils although he would wind them specifically for the crossover he was building.
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In terms of building the crossover, I simply hot glued them to the back of the plastic terminal plate. I documented the speaker build including the crossover on another forum but won't post the link here in case the mods don't like that sort of thing.
Hi there.
Im new to this forum. I read the query from Clevedonroger19, and i’m almost in the same situation. I’m trying to build the Ipl M1tlm by myself,since Ivan closed the shop( was trying to buy, but too late).
Got the the hivi m5n woofers,fountek cd1 ribbons, almost finished the cabinets, and Now to the tricky part😊 : Crossovers! Seen pictures of the x- overs : caps 2,2 in the highs,4,7 in the lows. inductors 3,9 and 2,4 in series before cap in the highs. The crossover frequency is stated to 4 kHz, on IPL homepage. Now i
Wonder if you guys could help me out with calculating the values of the inductors. I’ve Tried to use the crossover calculators, but i must do something wrong. Im new to this, but eager to learn, so please guide me through the calculation. Would really appreciate some help.
Thanx
Im new to this forum. I read the query from Clevedonroger19, and i’m almost in the same situation. I’m trying to build the Ipl M1tlm by myself,since Ivan closed the shop( was trying to buy, but too late).
Got the the hivi m5n woofers,fountek cd1 ribbons, almost finished the cabinets, and Now to the tricky part😊 : Crossovers! Seen pictures of the x- overs : caps 2,2 in the highs,4,7 in the lows. inductors 3,9 and 2,4 in series before cap in the highs. The crossover frequency is stated to 4 kHz, on IPL homepage. Now i
Wonder if you guys could help me out with calculating the values of the inductors. I’ve Tried to use the crossover calculators, but i must do something wrong. Im new to this, but eager to learn, so please guide me through the calculation. Would really appreciate some help.
Thanx
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There isn't a fixed way to get those values, you'll have to do at least part of the crossover design unless you want to use a try and tweak method. Therefore it would help to hear whether you are more likely to want to set up a simulator, do measurements or tweak by ear?
Ok, i see. I’m an old man😊, and gone through most of the trends,hypes and all weird things that happens in hifi. Listened to, and owned a lot of speakers,and i must say, i know how i want a speaker to sound, but i havent got the knowledge to measure, and i dont have the equipment. To be honest, a lot of the speakers i’ve listened to, that measures real good,sound just decent, and then some speakers that measures almost bad,sounds brilliant. So in my case, i would try to tweak by ear. If i could get some advice where to start , if i choose to go with the values i’ve seen from the pictures of the crossovers, i would be so thankful.
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Ok, I tracked down some factory data for the M5N. I used the 30 degree response as that is usually close to the room. As you can see from the plots, 1mH gets you the basic -6dB at the crossover so there's probably no point going below that value. 2mH gets you another -6dB which might take care of the baffle step. Then you might want a downward trend, and maybe if you choose to listen to them front on you might want to take a little more off the top end.
Would you like to see other values?
Would you like to see other values?
Thanx a lot AllenB.
Think Im gonna start with 1,5 mH for the hivi 5. Any suggestion on values for the fountek cd1? Im a bit confused when the IPL homepage says crossover 4khz. Isn’t that a bit High? So thankful for the help😊
Think Im gonna start with 1,5 mH for the hivi 5. Any suggestion on values for the fountek cd1? Im a bit confused when the IPL homepage says crossover 4khz. Isn’t that a bit High? So thankful for the help😊
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Hi I have a built and used pair of Mk2 S3TLM Ribbon crossovers that I'm not using as I now have a custom made electronic crossover if you want take measurements or buy.
Built mine in 1990 still used weekly still amazed,lovely speakers