Front port will not change your XO design, but you will need to make sure it isn’t contributing a resonance to the FR curve.
That close to a wall I would go sealed, PR or front port in that order.
That close to a wall I would go sealed, PR or front port in that order.
My simulation on WinISD gave me a port resonance of approx 1,1khz. How does this relate to the sound and what should I do in the crossover if I design the crossover using a simulated traced graph?
My suggestion, same Jeff Bagby have me… all you need on the woofer is 2nd order, 2uH and 10-12uF, then design the tweeter to match up.
That was my first XO design - 2uH and 12uF and it had the best phase and summation, but for my ears it was lacking some bass, so I changed it to fit my room and design.
I would HIGHLY recommend you start with Jeff’s recommendation, especially if you will be that close to the wall.
Also what size and length is your port, and box design? Port sounds like it is very short
Edit: also looks like your SIMs don’t have and baffle diffraction added so you baffles step compensation is likely off
That was my first XO design - 2uH and 12uF and it had the best phase and summation, but for my ears it was lacking some bass, so I changed it to fit my room and design.
I would HIGHLY recommend you start with Jeff’s recommendation, especially if you will be that close to the wall.
Also what size and length is your port, and box design? Port sounds like it is very short
Edit: also looks like your SIMs don’t have and baffle diffraction added so you baffles step compensation is likely off
Due to size constraints, the box will be 33,5x19,5x26,5 cm (HxWXD) using 18mm MDF giving a total of approx 10.8 liters. Port will be 4cm in diameter and 15cm in length giving fb of 43hz.
On the crossover side, since the ribbon tweeter cannot go below 2500hz 2nd order, i need to cross the woofer over at a higher frequency. I think an asymetrical order filter don't work well since the ribbon tweeter has a bit of a waveguide on it.
In my simulated crossover, there is a sharp peak impedance in the crossover frequency, what does this mean? Is it resonance? How will it affect the sound and how do i tame it, maybe zobel network? Thanks!
Couple suggestions to help us on the forum. When you post a schematic, name the speakers, so we know what tweeter you are using, seems like you changed form your original post, no longer using a ribbon?
If you are still modeling the SB dome tweeter - you can easily cross it lower than your recent SIM you posted.
Start at 2mH and 10uF on the woofer and go 3rd order to match up the tweeter, start at 6.2uF, 0.3uH to ground and 6.2uF with about 7 ohms resistance to the tweeter, then adjust as necessary.
I would start with it sealed, especially since you are going to be close to the wall. You will be surprised how much bass that 5" woofer puts out in 11liters sealed and close to a wall. You can always add a port (likely in the back it's after the fact) and adjust length to your taste after listening.
That tweeter will be fine @1.5-1.8k XO unless you plan to crack it up a lot. Running a low XO point and using it within its limits will deliver great results for a fantastic all around speaker build.
If you are still modeling the SB dome tweeter - you can easily cross it lower than your recent SIM you posted.
Start at 2mH and 10uF on the woofer and go 3rd order to match up the tweeter, start at 6.2uF, 0.3uH to ground and 6.2uF with about 7 ohms resistance to the tweeter, then adjust as necessary.
I would start with it sealed, especially since you are going to be close to the wall. You will be surprised how much bass that 5" woofer puts out in 11liters sealed and close to a wall. You can always add a port (likely in the back it's after the fact) and adjust length to your taste after listening.
That tweeter will be fine @1.5-1.8k XO unless you plan to crack it up a lot. Running a low XO point and using it within its limits will deliver great results for a fantastic all around speaker build.
I'm sorry, the tweeter is still a ribbon tweeter, since that is what I have lying around. I'm trying to suppress my build cost with it. But if that doesn't work, I might give up and try one of Jeff Bagby's design like the Piccolo
What ribbon specifically? That 5” can play fairly high, but I’d still advise 2nd order, and use an RLC to dampen the FR spike at about 2.5k (IMO) and possibly a tank resistor over the 2uH inductor to roll it off a little faster (add that last bc may not need it)