tweeter = Peerless DX25BG60-04
Woofer = Jbl 10px (10 inches)
Midranger = 4 inches (It was actually a fullrange that I'm filtering for mid frequencies) Midranger box = 2.90 liters (QTC = 0.585 Fsc = 159.17), I will coat this box with glass wool and it will be egg shaped
Woofer box = 35 liters sealed internally coated with glass wool Fsc: 248.75hz QTC ±1230
Woofer = Jbl 10px (10 inches)
Midranger = 4 inches (It was actually a fullrange that I'm filtering for mid frequencies) Midranger box = 2.90 liters (QTC = 0.585 Fsc = 159.17), I will coat this box with glass wool and it will be egg shaped
Woofer box = 35 liters sealed internally coated with glass wool Fsc: 248.75hz QTC ±1230
Where did you read it?
A book?
A Forum page?
A paper? (Think AES, an University or similar)
A salesman brochure?
Own experiment or test?
A You Tube Video?
All those possible sources have different quality and "trust" level.
If in doubt post here some link to the source of what worries you, so we can also read it.
Is that all of the parts in your crossover: that's four parts for a three way crossover?
How did you come up with those parts and values, please: people may be able to give you some advice on whether that might/might not work and why. Also, what mid-range are you using; your post says "4 inch".
The tweeter has been widely used in two and three way speakers and I've never seen it with less than three parts: check out Paul Carmody's "Tarkus" (3 way) and "Amiga" (2 way) and Paul Graves' "Supernova Minimus" 2 ways on the Parts Express Project Gallery.
Please remember, people are trying to help and trying to get a good result for you.
Geoff
This is sounding ominously like 1st order electrical values taken from xyz calculator assuming static resistive loads & no account for FR, impedance variation etc.
Well we all start somewhere and hopefully learn from our mistakes
That's the bare minimum and yes, it will work.
Can you improve it? .... You bet!
But that does not invalidate the basic principles.
Just as a reference, the then revolutionary AR2 acoustic suspension bookshelf cabinet crossover.
Admittedly a 2 way cabinet (instead of 3 way here) but only two components: 1 capacitor for the tweeter, 1 inductor for the woofer..
Agreed, there are many two and three way speakers - particularly from the 70s and 80s - which use the bare minimum, and many sound OK to very good. Two of my early purchases just let the mid bass driver run full range, just had a cap and resistor on the tweeter and sounded OK.
Some famous speakers such as the Dynaco two way sounded very good, at least to my ears. However, the drivers had been carefully selected to work that way and you can't get away with the minimum XO with any set of drivers. It would be great if you could do so, and make for cheaper and easier builds, but...
The OP's proposed crossover will produce noise, no doubt about that, but I think it would at least need some padding on the tweeter, which could of course be added later after tweaking. Here's what the tweeter FR looks like without any padding or contouring treatment:
Geoff
Some famous speakers such as the Dynaco two way sounded very good, at least to my ears. However, the drivers had been carefully selected to work that way and you can't get away with the minimum XO with any set of drivers. It would be great if you could do so, and make for cheaper and easier builds, but...
The OP's proposed crossover will produce noise, no doubt about that, but I think it would at least need some padding on the tweeter, which could of course be added later after tweaking. Here's what the tweeter FR looks like without any padding or contouring treatment:
Geoff
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They were produced by the calculator below because, in his previous thread, the T/S parameters of his drivers were unknown.
https://goodcalculators.com/crossover-calculator/
Calm down guys, I'm new to this, there's no need to get mad.
Here I will leave all the details of my project.
Let's start with the speakers:
As a tweeter I will use the DX25BG60-04 (peerless)
-100w 4ohms with ±91dB sensitivity
As Midranger I'm using an Aiyima brand speaker.
With these specifications:
Power: 30W Impedance: 4 ohms/8 ohms ± 15%
Category: round/square
Sensitivity: 88dB ± 3dB
Voice coil diameter: 25MM
Resonant frequency: 94Hz
Effective Frequency: 94Hz-10KHz
QTS: 0.72
Equivalent volume: 4.6L
As a woofer I'm using the JBL 10px whose manual with all the parameters I'm making available in PDF by clicking right here
My initial idea was to make cuts at ±400hz to ±3200hz
This was all discussed previously in a conversation here on the forum where my friend @Galu helped me make the electrical diagram.
According to tests I carried out to build the cabinet, the midranger box would be 2.90 liters and have a QTC close to 0.550hz
The woofer box will be 35 liters
Here I will leave all the details of my project.
Let's start with the speakers:
As a tweeter I will use the DX25BG60-04 (peerless)
-100w 4ohms with ±91dB sensitivity
As Midranger I'm using an Aiyima brand speaker.
With these specifications:
Power: 30W Impedance: 4 ohms/8 ohms ± 15%
Category: round/square
Sensitivity: 88dB ± 3dB
Voice coil diameter: 25MM
Resonant frequency: 94Hz
Effective Frequency: 94Hz-10KHz
QTS: 0.72
Equivalent volume: 4.6L
As a woofer I'm using the JBL 10px whose manual with all the parameters I'm making available in PDF by clicking right here
My initial idea was to make cuts at ±400hz to ±3200hz
This was all discussed previously in a conversation here on the forum where my friend @Galu helped me make the electrical diagram.
According to tests I carried out to build the cabinet, the midranger box would be 2.90 liters and have a QTC close to 0.550hz
The woofer box will be 35 liters
A quick search gives me nothing that I would use to build a crossover for those drivers except for padding the tweeter. BUT
I think the large driver chosen would be like the Eminence Alpha 10 and a midbass that could be used up to 1500Hz. If so it needs more than an inductor in the circuit or no midranger
Your concerns about capacitors are unfounded any distorted sound will probably be down to the unknown midrange driver
Your PDF link is a security risk according to my virus program; please copy as a jpeg and post here. My thoughts are that if you are going to use a midrange and use it properly in the octaves you have chosen[ and that is how I do it mainly] is that the midrange is the most important driver and shouldn't be chosen on cost alone
I think the large driver chosen would be like the Eminence Alpha 10 and a midbass that could be used up to 1500Hz. If so it needs more than an inductor in the circuit or no midranger
Your concerns about capacitors are unfounded any distorted sound will probably be down to the unknown midrange driver
Your PDF link is a security risk according to my virus program; please copy as a jpeg and post here. My thoughts are that if you are going to use a midrange and use it properly in the octaves you have chosen[ and that is how I do it mainly] is that the midrange is the most important driver and shouldn't be chosen on cost alone
Pedroga is very much a beginner when it comes to crossovers, but he is an eager student!
The crossover derived from the calculator was not intended to be an ultimate solution, but was one of the tools for educating him in the very basic requirements of a loudspeaker crossover, i.e., high pass, band pass and low pass filters and suitable choice of crossover frequencies.
At the time, we were not working with named drivers, so T/S parameters were not part of the discussion.
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But I think now would be a good time to start a slightly more advanced discussion.
Thanx Pedroga but that is the information needed to build the box.
To design the crossover we need much more.
We need a graph of the drivers frequency response along with the matching graph of the drivers impedance.
Now first off those details tells me this isn't a woofer at all but a professional midrange and at a guess quite like the Eminence Alpha. The drivers Fs is far too high for a woofer
To design the crossover we need much more.
We need a graph of the drivers frequency response along with the matching graph of the drivers impedance.
Now first off those details tells me this isn't a woofer at all but a professional midrange and at a guess quite like the Eminence Alpha. The drivers Fs is far too high for a woofer
Pedroga, you are over thinking things. Use all electrolytics for this project and don’t worry about anything greater than 50v and 10% tolerance. There are more of them in speakers around the world than all others combined by a massive margin. The drivers you have are fine, so are electrolytic for this system. You have a first order xo of the most basic design. As mentioned, you will notice a great deal of difference in getting the values correct more than you ever will in what type of cap or coil you use. You have no resistors nor shunting happening so you are at the very beginning of your journey. I hope it goes well. Your ears will tell you the truth. That’s the point at which this crew will be able to help with things like notches, zobels, L-pads, BSC, etc.
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