I am currently working on an AMI model I and although I’ve worked on a few of these I never really tried to figure out the crossover since the jukes always sounded amazing. I have one here that was missing the crossover and speakers but had an old RCA full range speaker connected directly to the amplifier. Surprisingly it sounded great! I have now found and installed the correct crossover and a 12” speaker from the model J, which has the same part number. I purchased a horn speaker “ for Model H-I” from eBay but received a piezo aftermarket horn speaker. Which I am going to replace! But I wanted to see how it would sound and it’s not good. What I don’t understand is the simple crossover design. The 3mF capacitor (which is now new) goes between the input and the 12” Low frequency speaker? Does this not block some of the low end frequencies going to the 12” speaker? From input to the tweeter there is a 15 ohm resistor and from input to the black/common connection there is a 33 ohm resistor. This makes little sense to me and would have thought this is wrong but I’ve looked at others that sound great and this set up is correct. Is there anyone that could enlighten me as to why it’s designed like this? I always thought the capacitor should be connected to the high frequency speaker. (I really miss Jim Alexander, he would be all over this) Thanks, Mauro Sent from my iPhone
Hi Mauro, First of all you cannot connect the piezo tweeter via the crossover, it doesn't connect that way. I have a copy of that crossover diagram and I think you must be reading it wrong, the HF output goes to the HF speaker via the 3uF capacitor and 15 ohm speaker as you would expect. The full output goes to the LF speaker. I will email you a copy of the diagram. Norman. ------ Original Message ------ From: jukebox-list@lists.netlojix.com To: jukebox-list@lists.netlojix.com Cc: m.desimone@rogers.com Sent: Monday, August 17th 2026, 22:14 Subject: [Jukebox-list] AMI H & I Speaker Crossover question I am currently working on an AMI model I and although I’ve worked on a few of these I never really tried to figure out the crossover since the jukes always sounded amazing. I have one here that was missing the crossover and speakers but had an old RCA full range speaker connected directly to the amplifier. Surprisingly it sounded great! I have now found and installed the correct crossover and a 12” speaker from the model J, which has the same part number. I purchased a horn speaker “ for Model H-I” from eBay but received a piezo aftermarket horn speaker. Which I am going to replace! But I wanted to see how it would sound and it’s not good. What I don’t understand is the simple crossover design. The 3mF capacitor (which is now new) goes between the input and the 12” Low frequency speaker? Does this not block some of the low end frequencies going to the 12” speaker? From input to the tweeter there is a 15 ohm resistor and from input to the black/common connection there is a 33 ohm resistor. This makes little sense to me and would have thought this is wrong but I’ve looked at others that sound great and this set up is correct. Is there anyone that could enlighten me as to why it’s designed like this? I always thought the capacitor should be connected to the high frequency speaker. (I really miss Jim Alexander, he would be all over this) Thanks, Mauro Sent from my iPhone _______________________________________________ Jukebox-list mailing list -- jukebox-list@lists.netlojix.com To unsubscribe send an email to jukebox-list-leave@lists.netlojix.com %(web_page_url)slistinfo%(cgiext)s/%(_internal_name)s Searchable Archives: http://jukebox.markmail.org/
I’ve moved the amplifier output (red) to the 2nd terminal which now puts full power to the LF 12” speaker and it is plenty loud. Now I have to find a proper horn speaker to work here. The piezo speaker does nothing. Thanks for the assistance so far. I’m hoping to get a compatible HF speaker tomorrow and install it on Thursday or Friday. I’ll post the results. Sent from my iPhone
On Aug 18, 2026, at 5:05 AM, NORMAN MACRAE <nmacrae23@btinternet.com> wrote:
Hi Mauro,
First of all you cannot connect the piezo tweeter via the crossover, it doesn't connect that way.
I have a copy of that crossover diagram and I think you must be reading it wrong, the HF output goes to the HF speaker via the 3uF capacitor and 15 ohm speaker as you would expect. The full output goes to the LF speaker. I will email you a copy of the diagram.
Norman.
------ Original Message ------ From: jukebox-list@lists.netlojix.com To: jukebox-list@lists.netlojix.com Cc: m.desimone@rogers.com Sent: Monday, August 17th 2026, 22:14 Subject: [Jukebox-list] AMI H & I Speaker Crossover question I am currently working on an AMI model I and although I’ve worked on a few of these I never really tried to figure out the crossover since the jukes always sounded amazing. I have one here that was missing the crossover and speakers but had an old RCA full range speaker connected directly to the amplifier. Surprisingly it sounded great! I have now found and installed the correct crossover and a 12” speaker from the model J, which has the same part number. I purchased a horn speaker “ for Model H-I” from eBay but received a piezo aftermarket horn speaker. Which I am going to replace! But I wanted to see how it would sound and it’s not good. What I don’t understand is the simple crossover design. The 3mF capacitor (which is now new) goes between the input and the 12” Low frequency speaker? Does this not block some of the low end frequencies going to the 12” speaker? From input to the tweeter there is a 15 ohm resistor and from input to the black/common connection there is a 33 ohm resistor. This makes little sense to me and would have thought this is wrong but I’ve looked at others that sound great and this set up is correct. Is there anyone that could enlighten me as to why it’s designed like this? I always thought the capacitor should be connected to the high frequency speaker. (I really miss Jim Alexander, he would be all over this) Thanks, Mauro Sent from my iPhone _______________________________________________ Jukebox-list mailing list -- jukebox-list@lists.netlojix.com To unsubscribe send an email to jukebox-list-leave@lists.netlojix.com %(web_page_url)slistinfo%(cgiext)s/%(_internal_name)s Searchable Archives: http://jukebox.markmail.org/
The piezo shoudn't do "nothing". It might not sound good, but should make some sort of sound. My AMI F120 had a bad capacitor in the crossover, and the HF horn didn't function at all because of it. Replacing the capacitor, a non-polarized electrolytic as I recall, fixed it. You probably want to check that. Come to think of it, when piezo tweeters first came out, we were told they could just be connected in parallel with the woofer and not require even a capacitor to block LF. You could try that to start with, at least prove whether it's your speaker or your crossover. A piezo shouldn't be damaged by direct connection; a regular tweeter can get blown out with too much LF energy. --> Steve On Tue, Aug 18, 2026 at 03:36:48PM -0400, M De Simone via Jukebox-list wrote:
I’ve moved the amplifier output (red) to the 2nd terminal which now puts full power to the LF 12” speaker and it is plenty loud. Now I have to find a proper horn speaker to work here. The piezo speaker does nothing. Thanks for the assistance so far. I’m hoping to get a compatible HF speaker tomorrow and install it on Thursday or Friday. I’ll post the results.
Sent from my iPhone
On Aug 18, 2026, at 5:05 AM, NORMAN MACRAE <nmacrae23@btinternet.com> wrote:
Hi Mauro,
First of all you cannot connect the piezo tweeter via the crossover, it doesn't connect that way.
I have a copy of that crossover diagram and I think you must be reading it wrong, the HF output goes to the HF speaker via the 3uF capacitor and 15 ohm speaker as you would expect. The full output goes to the LF speaker. I will email you a copy of the diagram.
Norman.
------ Original Message ------ From: jukebox-list@lists.netlojix.com To: jukebox-list@lists.netlojix.com Cc: m.desimone@rogers.com Sent: Monday, August 17th 2026, 22:14 Subject: [Jukebox-list] AMI H & I Speaker Crossover question I am currently working on an AMI model I and although I’ve worked on a few of these I never really tried to figure out the crossover since the jukes always sounded amazing. I have one here that was missing the crossover and speakers but had an old RCA full range speaker connected directly to the amplifier. Surprisingly it sounded great! I have now found and installed the correct crossover and a 12” speaker from the model J, which has the same part number. I purchased a horn speaker “ for Model H-I” from eBay but received a piezo aftermarket horn speaker. Which I am going to replace! But I wanted to see how it would sound and it’s not good. What I don’t understand is the simple crossover design. The 3mF capacitor (which is now new) goes between the input and the 12” Low frequency speaker? Does this not block some of the low end frequencies going to the 12” speaker? From input to the tweeter there is a 15 ohm resistor and from input to the black/common connection there is a 33 ohm resistor. This makes little sense to me and would have thought this is wrong but I’ve looked at others that sound great and this set up is correct. Is there anyone that could enlighten me as to why it’s designed like this? I always thought the capacitor should be connected to the high frequency speaker. (I really miss Jim Alexander, he would be all over this) Thanks, Mauro Sent from my iPhone _______________________________________________ Jukebox-list mailing list -- jukebox-list@lists.netlojix.com To unsubscribe send an email to jukebox-list-leave@lists.netlojix.com %(web_page_url)slistinfo%(cgiext)s/%(_internal_name)s Searchable Archives: http://jukebox.markmail.org/
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-- Steve Wahl steve@5wahls.com
If the piezo does nothing it is either broke or connected wrong. Connect it directly to one of the amp outputs. Piezo tweeters automatically reject bass, they don't need a crossover. Adjust the volume by experimenting with the speaker output tags. But in all honesty I don't think they sound amazing, you're better off with a decent tweeter, but choose that carefully too. Continental 1 had a horn, 2 had a tweeter, so there must be ones around to suit a H/I Nigel, UK
On 18 Aug 2026 at 20:37, M De Simone via Jukebox-list <jukebox-list@lists.netlojix.com> wrote:
I’ve moved the amplifier output (red) to the 2nd terminal which now puts full power to the LF 12” speaker and it is plenty loud. Now I have to find a proper horn speaker to work here. The piezo speaker does nothing. Thanks for the assistance so far. I’m hoping to get a compatible HF speaker tomorrow and install it on Thursday or Friday. I’ll post the results.
Sent from my iPhone
On Aug 18, 2026, at 5:05 AM, NORMAN MACRAE <nmacrae23@btinternet.com> wrote:
Hi Mauro,
First of all you cannot connect the piezo tweeter via the crossover, it doesn't connect that way.
I have a copy of that crossover diagram and I think you must be reading it wrong, the HF output goes to the HF speaker via the 3uF capacitor and 15 ohm speaker as you would expect. The full output goes to the LF speaker. I will email you a copy of the diagram.
Norman.
------ Original Message ------ From: jukebox-list@lists.netlojix.com To: jukebox-list@lists.netlojix.com Cc: m.desimone@rogers.com Sent: Monday, August 17th 2026, 22:14 Subject: [Jukebox-list] AMI H & I Speaker Crossover question I am currently working on an AMI model I and although I’ve worked on a few of these I never really tried to figure out the crossover since the jukes always sounded amazing. I have one here that was missing the crossover and speakers but had an old RCA full range speaker connected directly to the amplifier. Surprisingly it sounded great! I have now found and installed the correct crossover and a 12” speaker from the model J, which has the same part number. I purchased a horn speaker “ for Model H-I” from eBay but received a piezo aftermarket horn speaker. Which I am going to replace! But I wanted to see how it would sound and it’s not good. What I don’t understand is the simple crossover design. The 3mF capacitor (which is now new) goes between the input and the 12” Low frequency speaker? Does this not block some of the low end frequencies going to the 12” speaker? From input to the tweeter there is a 15 ohm resistor and from input to the black/common connection there is a 33 ohm resistor. This makes little sense to me and would have thought this is wrong but I’ve looked at others that sound great and this set up is correct. Is there anyone that could enlighten me as to why it’s designed like this? I always thought the capacitor should be connected to the high frequency speaker. (I really miss Jim Alexander, he would be all over this) Thanks, Mauro Sent from my iPhone _______________________________________________ Jukebox-list mailing list -- jukebox-list@lists.netlojix.com To unsubscribe send an email to jukebox-list-leave@lists.netlojix.com %(web_page_url)slistinfo%(cgiext)s/%(_internal_name)s Searchable Archives: http://jukebox.markmail.org/
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Piezo horns are harsh, hunt down a goodmans horn for your ami jukebox.... On Wed, 19 Aug 2026 at 07:47, Nigel Pugh via Jukebox-list < jukebox-list@lists.netlojix.com> wrote:
If the piezo does nothing it is either broke or connected wrong. Connect it directly to one of the amp outputs. Piezo tweeters automatically reject bass, they don't need a crossover. Adjust the volume by experimenting with the speaker output tags. But in all honesty I don't think they sound amazing, you're better off with a decent tweeter, but choose that carefully too.
Continental 1 had a horn, 2 had a tweeter, so there must be ones around to suit a H/I
Nigel, UK
On 18 Aug 2026 at 20:37, M De Simone via Jukebox-list <
jukebox-list@lists.netlojix.com> wrote:
I’ve moved the amplifier output (red) to the 2nd terminal which now
puts full power to the LF 12” speaker and it is plenty loud. Now I have to find a proper horn speaker to work here. The piezo speaker does nothing.
Thanks for the assistance so far. I’m hoping to get a compatible HF speaker tomorrow and install it on Thursday or Friday. I’ll post the results.
Sent from my iPhone
On Aug 18, 2026, at 5:05 AM, NORMAN MACRAE <nmacrae23@btinternet.com> wrote:
Hi Mauro,
First of all you cannot connect the piezo tweeter via the crossover, it doesn't connect that way.
I have a copy of that crossover diagram and I think you must be reading it wrong, the HF output goes to the HF speaker via the 3uF capacitor and 15 ohm speaker as you would expect. The full output goes to the LF speaker. I will email you a copy of the diagram.
Norman.
------ Original Message ------ From: jukebox-list@lists.netlojix.com To: jukebox-list@lists.netlojix.com Cc: m.desimone@rogers.com Sent: Monday, August 17th 2026, 22:14 Subject: [Jukebox-list] AMI H & I Speaker Crossover question I am currently working on an AMI model I and although I’ve worked on a few of these I never really tried to figure out the crossover since the jukes always sounded amazing. I have one here that was missing the crossover and speakers but had an old RCA full range speaker connected directly to the amplifier. Surprisingly it sounded great! I have now found and installed the correct crossover and a 12” speaker from the model J, which has the same part number. I purchased a horn speaker “ for Model H-I” from eBay but received a piezo aftermarket horn speaker. Which I am going to replace! But I wanted to see how it would sound and it’s not good. What I don’t understand is the simple crossover design. The 3mF capacitor (which is now new) goes between the input and the 12” Low frequency speaker? Does this not block some of the low end frequencies going to the 12” speaker? From input to the tweeter there is a 15 ohm resistor and from input to the black/common connection there is a 33 ohm resistor. This makes little sense to me and would have thought this is wrong but I’ve looked at others that sound great and this set up is correct. Is there anyone that could enlighten me as to why it’s designed like this? I always thought the capacitor should be connected to the high frequency speaker. (I really miss Jim Alexander, he would be all over this) Thanks, Mauro Sent from my iPhone _______________________________________________ Jukebox-list mailing list -- jukebox-list@lists.netlojix.com To unsubscribe send an email to jukebox-list-leave@lists.netlojix.com %(web_page_url)slistinfo%(cgiext)s/%(_internal_name)s Searchable Archives: http://jukebox.markmail.org/
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participants (5)
-
John Wilson -
M De Simone -
Nigel Pugh -
NORMAN MACRAE -
Steve Wahl