Hi All,
So I've simulated the crossover with just 16uf on the woofer. It comes up well with some minor adjustments to the tweeter circuit, but my only concern now is that the crossover point is up at 1750Hz. That's pretty close to the upper limit for this woofer and also the crossover limit for the driver centre to centre distances. I'll give it a go, nothing ventured nothing gained.
Cheers
So I've simulated the crossover with just 16uf on the woofer. It comes up well with some minor adjustments to the tweeter circuit, but my only concern now is that the crossover point is up at 1750Hz. That's pretty close to the upper limit for this woofer and also the crossover limit for the driver centre to centre distances. I'll give it a go, nothing ventured nothing gained.
Cheers
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Hi Raymondj,
I have simulated the horizontal off axis responses in WinPCD and there's not much deviation from the on axis plot. Only in the crossover region does the response dip, but only by 3db at 60 deg. The treble drops off gradually from 8khz as the angle increases. 5db below flat at 60 deg. The Wavecor tweeter I'm using does have a waveguide. When I did a listening test, I could move around the speaker and the sound hardly changed from on axis.
I have simulated the horizontal off axis responses in WinPCD and there's not much deviation from the on axis plot. Only in the crossover region does the response dip, but only by 3db at 60 deg. The treble drops off gradually from 8khz as the angle increases. 5db below flat at 60 deg. The Wavecor tweeter I'm using does have a waveguide. When I did a listening test, I could move around the speaker and the sound hardly changed from on axis.
Hi eg92b16a,
It sounds like you are there or thereabouts. I wish I could here it. Much of UK used to live with an 8 woofer and one inch tweeter. In an IB or reflex cab, beaming and power response didn't seem to come up much as a topic then. It's a format I grew up with and like. Balance the two drivers to your taste and they will serve you well for years. The SB23 is rather good isn't it. I haven't tried the wavecor. I am working up something using the same bass and probably a seas tweeter in a medium sized IB which looks promising for crossing over around your chosen crossover frequencies, maybe a tad higher.
It sounds like you are there or thereabouts. I wish I could here it. Much of UK used to live with an 8 woofer and one inch tweeter. In an IB or reflex cab, beaming and power response didn't seem to come up much as a topic then. It's a format I grew up with and like. Balance the two drivers to your taste and they will serve you well for years. The SB23 is rather good isn't it. I haven't tried the wavecor. I am working up something using the same bass and probably a seas tweeter in a medium sized IB which looks promising for crossing over around your chosen crossover frequencies, maybe a tad higher.
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Hi Raymondj.
I believe that the SB23NBACS45-8 is a superb driver. Definitely not as bad as some people have made it out to be. The sound is detailed and somewhat mellow. Never bright or harsh. You wouldn’t know it’s an aluminium cone. The 4khz breakup is easily tamed and the bass extension in the TL is simply amazing (thanks to Paul). I’ve tried 2 of the crossovers side by side and the only difference I can make is that the V2 is a little more detailed and the tweeter seems more integrated than the V1. Could be the crossover caps, could be the l-pad being a little hotter on the V1. From my initial listening, it sounds as good as my troels 3way classic. I’ll do some measuring in the coming weeks. Starting to get really busy at this time of year.
Cheers.
I believe that the SB23NBACS45-8 is a superb driver. Definitely not as bad as some people have made it out to be. The sound is detailed and somewhat mellow. Never bright or harsh. You wouldn’t know it’s an aluminium cone. The 4khz breakup is easily tamed and the bass extension in the TL is simply amazing (thanks to Paul). I’ve tried 2 of the crossovers side by side and the only difference I can make is that the V2 is a little more detailed and the tweeter seems more integrated than the V1. Could be the crossover caps, could be the l-pad being a little hotter on the V1. From my initial listening, it sounds as good as my troels 3way classic. I’ll do some measuring in the coming weeks. Starting to get really busy at this time of year.
Cheers.
Hi all.
I have decided on the crossover with the 18uf cap on the woofer section. Minimal components also, so I have removed the lcr notch and adjusted the tweeter coil resistance to balance that change in the woofer circuit. Listened to pink Floyd (echoes) to break them in a little. Closed my eyes, wow. Drums coming from the centre, guitars flanked, vocals from the centre, and effects bouncing around left and right. Felt like they were there playing to me. I’m going to add the lcr to one speaker and do some critical listening, just to see if it does anything audibly. The simulation puts the 4khz breakup 3db further down with the notch.
Cheers.
I have decided on the crossover with the 18uf cap on the woofer section. Minimal components also, so I have removed the lcr notch and adjusted the tweeter coil resistance to balance that change in the woofer circuit. Listened to pink Floyd (echoes) to break them in a little. Closed my eyes, wow. Drums coming from the centre, guitars flanked, vocals from the centre, and effects bouncing around left and right. Felt like they were there playing to me. I’m going to add the lcr to one speaker and do some critical listening, just to see if it does anything audibly. The simulation puts the 4khz breakup 3db further down with the notch.
Cheers.
Thanks dissi for the kind words.
Also thanks to everyone who has helped me progress through the build. I take everything on board and have learned heaps from this project.
This extra knowledge has led me to re-analyse all of my other projects to see if there’s any improvements to be made.
Cheers
Jason.
Also thanks to everyone who has helped me progress through the build. I take everything on board and have learned heaps from this project.
This extra knowledge has led me to re-analyse all of my other projects to see if there’s any improvements to be made.
Cheers
Jason.
Very nice woofer you are using so please let me interfere. As Zvu pointed out, this driver has break-up issue at 4 kHz which need to be treated with LC trap at 4 kHz in order to to complete the design of a good sounding metal loudspeaker. The low-pass acoustical slope need to resemble flat descending line at the area of break-up.
Does this cap need to be high quality like a Jantzen superior Z cap, or will a greencap do?
I've simulated the response in Virtuix CAD and a 0.56uf cap works perfectly with 33 ohms.
The transfer function has a bit of a knee at 5khz where the rolloff tapers off from LR6 to LR2, but still 36db down from reference SPL in the higher end.
The 4khz breakup is now at least 30db down from reference SPL instead of 25db previously.
Cheers
I've simulated the response in Virtuix CAD and a 0.56uf cap works perfectly with 33 ohms.
The transfer function has a bit of a knee at 5khz where the rolloff tapers off from LR6 to LR2, but still 36db down from reference SPL in the higher end.
The 4khz breakup is now at least 30db down from reference SPL instead of 25db previously.
Cheers
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