In the new issue of the German magazine Hobby Hifi (2-3/2023), mr Bernd Timmermanns offered an update to his Jericho horn, this time using the Dayton PS220-8 fullranger.
The measurements are promising. You can also see the effect of the correction filter. It looks like an interesting project.
The magazine has a 14 page detailed article including a step by step construction guide.
. 
. 
The measurements are promising. You can also see the effect of the correction filter. It looks like an interesting project.
The magazine has a 14 page detailed article including a step by step construction guide.
. .
Last edited by a moderator:
Hi, do you need to subscribe to HH to access the article? I’m looking for a reasonably sized BLH preferably mouth facing rearward into the corner to build that performs well.
I bought it in a newspaper shop in Belgium. I think you can order a copy of the magazine from the website. They don t do pdf
Last edited:
Version 2 with the Ciare Issue 2, 2008. Note the resonator with the wihite BAF wadding, note no driver chamber and sloping sidewalls in the first flare with the driver
The version one is different in the intital parts and does not have a HHR.
The version one is different in the intital parts and does not have a HHR.
Last edited:
This horn can be transformed to radiate to the rear if you just prolongue the beginning of the horn behind the driver upwards and turn the driver to the other side. The horn gets some 30cm longer.
However I would leave out the damping chamber for 180 hertz as this is a gain in efficiency and can be easily tamed with an eq, often smartfone eq have 150 hertz adjustment possibility.
However I would leave out the damping chamber for 180 hertz as this is a gain in efficiency and can be easily tamed with an eq, often smartfone eq have 150 hertz adjustment possibility.
Attachments
I have the magazine at home. Maybe I will ask a carpenter to make me this horn for my beyma 8agn driver
The beyma has a Faraday copper cap on the pole piece I found out after ventilating the dust cap.
Nobody tells this, in no forum and not even Beyma!!
The beyma has a Faraday copper cap on the pole piece I found out after ventilating the dust cap.
Nobody tells this, in no forum and not even Beyma!!
Attachments
Not only EQ makes sense for correcting f response but also putting a high pass filter below horn resonance.
Maybe you could let it work some hertz lower, compensate for it and cut with at least 24db beyond
Maybe you could let it work some hertz lower, compensate for it and cut with at least 24db beyond
The Beyma might work
https://speakerboxlite.com/subwoofers/beyma-8-ag-n/specifications
The Qt of 1.0 an Fr of 100 Hz are both on the high side.
If you build them have the carpenter make room for bigger magnets from the start. My guess is that both classical fullrange drivers from SB, Seas and others as well as PA drivers (and a tweeter).
https://speakerboxlite.com/subwoofers/beyma-8-ag-n/specifications
The Qt of 1.0 an Fr of 100 Hz are both on the high side.
If you build them have the carpenter make room for bigger magnets from the start. My guess is that both classical fullrange drivers from SB, Seas and others as well as PA drivers (and a tweeter).
I checked the Beyma it is less deep built than the Dayton fullrange.
The Beyma would certainly profit from a double magnet.
I will buy one.
It would bring a dB in efficiency and bring down its qts by 0,1 or even 0,2
However the horn dominates the sound reproduction in the bass
The Beyma would certainly profit from a double magnet.
I will buy one.
It would bring a dB in efficiency and bring down its qts by 0,1 or even 0,2
However the horn dominates the sound reproduction in the bass
I have tried to model it in Hornresp, I used the wizard and set is a tapped horn with the driver between section 1 and 2. I wanted to slide the driver 14 cm into the horn but I can not get the sliders up. Perhaps I have to make it a "horn" instead of a "tapped horn".
The horn start at 135 cm2 and ends at 2000 cm2 with a lenght of 250 cm the driver is 14 cm from start of the horn. The HelmHolz resonator is 2.4 L and has a 5 cm opening 1.9 cm long.
The first section of the horn is 56 cm long and the final opening to the next section is 203 cm2
With the driver at the intersection of L12 56 cm and L23 194 cm there is s deep null 200 Hz. I will have to RTFM again.
The horn start at 135 cm2 and ends at 2000 cm2 with a lenght of 250 cm the driver is 14 cm from start of the horn. The HelmHolz resonator is 2.4 L and has a 5 cm opening 1.9 cm long.
The first section of the horn is 56 cm long and the final opening to the next section is 203 cm2
With the driver at the intersection of L12 56 cm and L23 194 cm there is s deep null 200 Hz. I will have to RTFM again.
The Viech Horn for Beyma 8agn goes down only to 60 hertz.
Jericho 2023 down to 50 Hertz.
If I would be in the situation to build a house I would leave out space in two appropriate corners for "drop in" back loaded horns.
You would have clean end into a corner.
I once had changed a Mauhorn 5 to a frontloaded bass horn. For this I took a 25 cm bass driver in 80 liter reflex tuned to 20 hertz and connected the chamber in the Mauhorn with the bass reflex box. The Mauhorn pointing at the room corners.
I had no measurement equipment at that time but I remember that playing car Hifi bass CDs were impressive as you could "feel" the bass overwhelming you. It shook your sofa in 5m distance easily.
Jericho 2023 down to 50 Hertz.
If I would be in the situation to build a house I would leave out space in two appropriate corners for "drop in" back loaded horns.
You would have clean end into a corner.
I once had changed a Mauhorn 5 to a frontloaded bass horn. For this I took a 25 cm bass driver in 80 liter reflex tuned to 20 hertz and connected the chamber in the Mauhorn with the bass reflex box. The Mauhorn pointing at the room corners.
I had no measurement equipment at that time but I remember that playing car Hifi bass CDs were impressive as you could "feel" the bass overwhelming you. It shook your sofa in 5m distance easily.