This has been a really great thread on upgrading, modification and measurements. I'm really pleased you are happy with all your hard efforts, John!
Can you post a picture of the speakers as they look now?
Can you post a picture of the speakers as they look now?
Thank you 🙂!
I had a little "stomach problems" after appendix problem, but not by surgical scar but generally in the stomach/intestines.
But the last 3 day´s has been better and better ( had been eating Omeprazol-medicin 14 day´s) , so soon im training for marathon again 😉
+1 celsius here in Sweden and snow-rain outside, so I long for spring and first flower´s to come now.
Still so happy with the modification on the Jamo D590 speaker, it just sounds so great whatever music you play with them.
And even with real high volymes the distortionlevel is real low and the sound is "kept together"
I have about 80-100 watt to give them with my 5 year old Onkyo 746 receiver, and after a lot of testing a 150 watt/8 Ohm amp should be a perfect match if you want to use the modification for 100% of capacity.
Bets regards John
Thank you for your kind words 🙂
I will try to get some pic´s and post them !
Best regards John
You can get it from TLHP for 64 Euro each at:
https://en.toutlehautparleur.com/speaker-peerless-sls-p830667-8-ohm-8-39-inch.html
It´s a french trusted company, and i have orderd from them about 20 times and always get it to my door in about 4 day´s 👍
A little more expensive from 80-95 Euro in the other 3 places in Europe how sells them:
https://www.soundimports.eu/en/peerless-by-tymphany-sls-p830667.html
https://www.hifisound.de/Do-it-your...fer-SLS-P830667-Vifa-8-39-8-Paper-Coated.html
https://loudspeakershop.eu/peerless-sls-8-830667-p-1586.html
Here is also a simulation in program BASTA for that Peerlees woofer, it´s perfect with 50 liters and tune in at 30 hz as i have done👌
Best regards John
Attachments
Hello all of you Jamo owners! And thank you for really interesting readings. A special thank you to those of you who provided schematics of xovers. I was going insane trying to figure out how my xover was coupled. Never heard of this isobaric xover.
Been reading this for a couple of weeks but joined this forum today!
The reason is, I own a pair of Jamo 707a (yes, 'a', that´s what the label on the rear terminal says). I bought them in 1994 and it seems like Jamo kept this curved design for quite a while, as it can also be seen in 707i and D 590 models (maybe more models?) The interior changed, though.
To cut it short, I have never been a hifi diy-guy but I had to refoam the push-pulled 8" woofers, with success! (Mind you, I am 70+). Since the cabinett is very well built, IMHO, it seemed like a terrible waste to just throw them away.
I recently bought a new integrated amp, Rotel RA-1572 MK2, and the speakers sound just great. However, what to do with a 28 years old xover? I think I need some more clarity in the upper regions, or maybe it's just my aging ears. But they are the ones usually listening.
I can see from Jawens (hey, I'm from Sweden too) and Moorclos' posts that my xover should be the same isobaric 4th bandpass, with other values and names.
My capacitors are: C1 10uF, C2 72uF, C3 150 uF, C4 4,7 uF. Attaching images.
Well, stopping here before you get tired of reading. Your help will be highly appreciated!
Thank you and take care!
Been reading this for a couple of weeks but joined this forum today!
The reason is, I own a pair of Jamo 707a (yes, 'a', that´s what the label on the rear terminal says). I bought them in 1994 and it seems like Jamo kept this curved design for quite a while, as it can also be seen in 707i and D 590 models (maybe more models?) The interior changed, though.
To cut it short, I have never been a hifi diy-guy but I had to refoam the push-pulled 8" woofers, with success! (Mind you, I am 70+). Since the cabinett is very well built, IMHO, it seemed like a terrible waste to just throw them away.
I recently bought a new integrated amp, Rotel RA-1572 MK2, and the speakers sound just great. However, what to do with a 28 years old xover? I think I need some more clarity in the upper regions, or maybe it's just my aging ears. But they are the ones usually listening.
I can see from Jawens (hey, I'm from Sweden too) and Moorclos' posts that my xover should be the same isobaric 4th bandpass, with other values and names.
My capacitors are: C1 10uF, C2 72uF, C3 150 uF, C4 4,7 uF. Attaching images.
Well, stopping here before you get tired of reading. Your help will be highly appreciated!
Thank you and take care!
Attachments
Nice,is there a big difference with the new Rotel?
Got my eyes on Yamaha A-S1200
Or Technics SU-G700mk2 for a future upgrade
Got my eyes on Yamaha A-S1200
Or Technics SU-G700mk2 for a future upgrade
Hi Belemakare, I am VERY pleased with this amp but had a quick look at your other options. They are in the same price range as big brother of mine, Rotel RA-1592mk2.
Generally speaking, there are pros and cons with everything in life. My philosophy has been: do some benchmarking with reviews from fairly reliable sources, make a listening test if possible, then follow your gut feeling and like what you hear. With hifi, there is always something "better" (often more expensive). But the more you pay, the smaller the difference will be.
Like so many are pointing out on this forum, the fun is to have a decent system and then try to test different improvements that makes it even more fun!
It's all about music.
Good luck!
Generally speaking, there are pros and cons with everything in life. My philosophy has been: do some benchmarking with reviews from fairly reliable sources, make a listening test if possible, then follow your gut feeling and like what you hear. With hifi, there is always something "better" (often more expensive). But the more you pay, the smaller the difference will be.
Like so many are pointing out on this forum, the fun is to have a decent system and then try to test different improvements that makes it even more fun!
It's all about music.
Good luck!
I understand your exitement, please update info on how things develope. Wishing you the best of luck!
Alright now i have tested the new mids and tweeters and its a nice improvment!
more details in voices and tighter,faster midrange
One thing i noticed is there is only about one mm sealing area between the hole for the tweeter and the mids..
I also tried with foam in the bassport to ”stiffen” up the sound and it works at least a little and probably leads to a more correct sound but maybe a bit boring🤷🏻♂️
At least in my home the speakers have a lot of bass,but not as tight as i want..,they stand about 30cm from the backwall and 70cm from the sidewalls
more details in voices and tighter,faster midrange
One thing i noticed is there is only about one mm sealing area between the hole for the tweeter and the mids..
I also tried with foam in the bassport to ”stiffen” up the sound and it works at least a little and probably leads to a more correct sound but maybe a bit boring🤷🏻♂️
At least in my home the speakers have a lot of bass,but not as tight as i want..,they stand about 30cm from the backwall and 70cm from the sidewalls
Maybe keep tweaking positioning. Another old trick you could try is a bunch of McDonalds straws in the ports 😆
👍
Also agree with motokok, move them around and listen. The manual for my 707's says they are tuned to be close to rear wall but I find that the bass sounds better away from rear wall, a meter/yard or more (if that's possible in your room). Also gives more spacious sound, at least in my case. Room parameters are of course essential, My house is timber, inside is naked timber which probably dampens some unwanted reflections.
By the way, did you buy a new amp?
No new amp yet,new engine to the lawn mower and fix the AC on wifes car instead💸💸😤
But Messing around with the bassport today and this seem to be a nice compromise for now,less bass but a little less sloppy but the bass is still like a tired slow sub..
Next thing will be woofer,filter when time/money allows😤🤹🏿♂️
But Messing around with the bassport today and this seem to be a nice compromise for now,less bass but a little less sloppy but the bass is still like a tired slow sub..
Next thing will be woofer,filter when time/money allows😤🤹🏿♂️
Attachments
Out with the old yamaha and in with the
”New” Harman/kardon
And this was a nice upgrade! More air and seperation in the sound and with this one its way clearer when you play loud,
The jamos never sounded this tight with the yamaha!
”New” Harman/kardon
And this was a nice upgrade! More air and seperation in the sound and with this one its way clearer when you play loud,
The jamos never sounded this tight with the yamaha!
Attachments
Nice to hear you are satisfied with the HK. They made some good amplifiers back then.
Seems like this thread has come to an end. John (jawen) is happy and the rest of us may, or may not, continue the Jamo improvements.
Cut out 5mm mdf spacers for the mids,should fit under the original grill with some minor trim to the frame of the grill,
Also had a fantastic beer!
After listening to the speakers for some time with the new mids,tweeter and amp i think it sounds really good but the treble is a bit low still, thinking about trying the
Scan speak discovery D2604/833000 tweeter with 94db sensetivity
Also had a fantastic beer!
After listening to the speakers for some time with the new mids,tweeter and amp i think it sounds really good but the treble is a bit low still, thinking about trying the
Scan speak discovery D2604/833000 tweeter with 94db sensetivity
Attachments
Alright now the modified xovers are installed and tested and wow what a difference! A brighter an clearer sound in the upper range and guitars more up front in the sound🎸👍🏻
Probably a nice thing to do even if you dont do anything else to the speakers.
So far all the modifications have been worth doing
The quest continues😉
Probably a nice thing to do even if you dont do anything else to the speakers.
So far all the modifications have been worth doing
The quest continues😉
