Good evening everyone. So I have decided to put most of my projects in the back burner in-till I have my wood lathe delivered..( hopefully in the next few weeks)? So the tweeters I want to replace is an older set of seas fabric dome tweeters. So I am looking at the sizes 1 to 2 1/2 inch full range drivers that are 8 ohms. If the db is low no big deal. I can add another one in the back to to raise the db of the drivers. So I already have a 6 1/2 driver in mind. The Mark Audio's CHR 120 silver drivers. I guess am asking for help because I have never used a full range driver lower then 3 inch's. I have a cap that can be put on the small full range drivers. It might be 500 hz? Well please let me know what you think about this idea? Am asking before I spend the money to up date his speaker's. The reason for the update. Little ones have had their day with the speaker drivers and it's not pretty or sounds right. Jeff
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So the speakers am working on are a basic 2 way speaker. A 1 inch fabric tweeter and a 6 1/2 woofer. I am replacing the woofer with the Mark Audio CHR-120 which I was told has a long throw woofer and that's what it was intended to be. Now for the tweeters. I am not going to buy or replace them with tweeters but, I was looking instead for a suitable 1 inch and up to a 2 1/2 inch full range driver if possible? .. Sorry for the confusion or not be being clear enough. I hope this helps. Jeff
Jeff,
The CHR-120 doesn't need a tweeter, as it goes to 20kHz without issue. The simplest answer is; replace your tweeter with a circular piece of wood.
The bigger question is; is the box even suitable for CHR-120? You can't just stick any driver in any box and expect it to sound good.
Is the current speaker a sealed unit? Or perhaps bass reflex? What are the internal measurements?
CHR-120 is certainly not simply a woofer:
The CHR-120 doesn't need a tweeter, as it goes to 20kHz without issue. The simplest answer is; replace your tweeter with a circular piece of wood.
The bigger question is; is the box even suitable for CHR-120? You can't just stick any driver in any box and expect it to sound good.
Is the current speaker a sealed unit? Or perhaps bass reflex? What are the internal measurements?
CHR-120 is certainly not simply a woofer:
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Yes very true. Thanks for reminding me. Its a rear ported floor standing box. Yes I can cover the tweeter holes with wood. I am going to guess as close as I can about the internal measurement. So the out side measurements are 36 inch's tall by 8 inch's wide by 10 inches deep. Now I have a sealed sand trap on the bottom and top of speakers inter box chamber. So the inside measure means with sand traps us 24 inch's tall by by 8 inch wide by 10 inches deep. So the cubic feet is 1.11 cubic feet is the box volume. So it's close to the 1.0 cubic feet Madison's has posted as a option for a vented box. It looks like it will work out really nice in the speakers my building. I will call Madisound tomorrow to see what they say? Jeff
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I've changed the thread name from "Help with replacing a tweeter for a full range driver?" to "Help with replacing a tweeter with a full range driver?"
Jeffrey 01, let me know if this doesn't help 😉
Jeff,
Approximate measurements will get you approximately good results, but only with some luck.
I recommend taking your time and getting it right. Myself and other folks here can help more than Madisound. In fact, you will see that the Madisound box plans for the CHR-120 are designed by Dr. Scott Lindgren. He is our local "Scottmoose".
If we know the exact internal box measurements, then it will be easy to run that through a bass-reflex simulation and recommend a proper tuning for that box size and the CHR-120.
I'd be happy to do that if you are willing to put the work in to get the measurements. Current port measurements would be great to have too. It might be a simple matter of trimming some off the existing port (if you are lucky).
Approximate measurements will get you approximately good results, but only with some luck.
I recommend taking your time and getting it right. Myself and other folks here can help more than Madisound. In fact, you will see that the Madisound box plans for the CHR-120 are designed by Dr. Scott Lindgren. He is our local "Scottmoose".
If we know the exact internal box measurements, then it will be easy to run that through a bass-reflex simulation and recommend a proper tuning for that box size and the CHR-120.
I'd be happy to do that if you are willing to put the work in to get the measurements. Current port measurements would be great to have too. It might be a simple matter of trimming some off the existing port (if you are lucky).
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I will have to do some digging and see where I put all my notes on the box design. I will get back with you later to night. Thanks Jeff
How about using a ceramic driver from a mini x duo ? Unfortunately I think that they are 4 ohms. I've used a small full range as a tweeter with no problems and I'm planning on using a Dayton audio 2 1/2 " woven glass fibre driver in a future project.
That's a great idea am all for it but, my dad's integrated 2 channel amp only goes down to 6 ohms and up to 8 ohms or I would have used 4 ohm drivers at the beginning of the build years ago. Jeff
So from my memory. The inside dimension of the box is?
24 high by 61/2 wide by 8.50 deep. That equals to:
0.7674 FT3. I think the port is 1 inch wide with and I have no idea how long? I will have to go to my dad's and measure the ports length. Jeff
I have to apologize for being so obsessive. I simply can't help you without knowing I am working with the right measurements.
Also, if you are going go the other direction and use a tweeter anyway, then I highly recommend taking this to the Multi-Way sub-forum because you are going to need to design a proper crossover to get it to sound right with the CHR. And if you are going to do that, then perhaps there is a better mid-bass driver to use instead.
Also, if you are going go the other direction and use a tweeter anyway, then I highly recommend taking this to the Multi-Way sub-forum because you are going to need to design a proper crossover to get it to sound right with the CHR. And if you are going to do that, then perhaps there is a better mid-bass driver to use instead.
Jeffery 01,
Have you tried out any box modelling software to see how the CHR-120 would model in your 0.7674 cu. ft cabinet?
Also please note the frame size and cutout size for the CHR-120 - these are 202 mm and 168 mm respectively. Your box outside diameter was 8" (203.2 mm) and inside diameter you mention is 6.5" which 165mm, and less than the recommended cutout diameter for the driver. Not sure if the the CHR-120 will fit the box you have in mind?
Maybe take a look at smaller/different drivers or a new box?