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Projekt DAKAR 2025

Hej, jag heter Andreas och håller på med en satsning inför Dakar 2025, därav har jag ett behov av sponsring.

Under det närmaste året så har jag tänkt att sikta in mig på ett par större endurotävlingar inom Sverige.
Men även en massa enduro/offroad körning för att bygga upp självförtroendet till crossmaskinen.
Till detta så går det åt en massa slitagedelar som jag nu skulle behöva hjälp av dig att sponsra mig med.

Gå till länken här under för att komma till sidan där jag har insamlingen.

Tack på förhand

Jamo D590 / 7.7

JAMO 7.7i project

The beautifully JAMO 707 series speakers.

Model listed in chronologic order::

707 (double 8? bass driver) was launched in year 1993
707a (double 8? bass driver)
707i (double 8? bass driver)
7.7 (single 8? bass driver) was released in year 2000
D590 (single 8? bass driver) aka Jamo Concert 590. Sold in the mid double 0’s

For the 7.7 and D590 applies:

3 Way Bassreflex
Woofer (inch/mm): 8 / 203
Midrange (inch/mm) 2 x 5/127
Tweeter (inch/mm): 1 / 25 Dome
Power, long/short term (Watt): 200/280
Sensitivity (dB – 2,8V / 1m): 90
Frequency range (Hz): 35 – 20000
Cross-over frequency (Hz): 150 / 2500
Impedance (Ohm): 4
Total volume (liters): 107,9
Weight (kg/lb): 25.80 / 56.88
Dimensions HxWxD (mm/in): 1,060.00×261.00×390.00 / 41.73×10.28×15.35

Instruction for use for the D570 and D590 – but it goes for the others models as well.
Crossover diagram for the 7.7 version – its drawen by me, I still need to messure mH values.

Link to the specs of the bass driver This driver may or may not be the originally woofer!?
Are these, the “Jamo item 20316”, really the originally mounted bass driver in the 7.7?
It just seems to be too thin a bass driver to match up the rest of the speaker. The bass driver weight is only about 1010g. (2,23Ib) and to compare.. the midrange driver has a weight of 820g Link to the new woofer

Power handling: 50 watts RMS
100 watts max b
VCdia: 1-1/4?
Le: 3.06 mH
Impedance: 8 ohms
Re: 5.47 ohms
Frequency response: 40-2,000 Hz
Fs: 48 Hz
SPL: 87 dB 1W/1m
Vas: 1.13 cu. ft. / 33 litr
Qms: 7.10
Qes: 0.73
Qts: 0.66
Xmax: 3 mm
Dimensions: A: 8-1/16?, B: 7-1/4?, C: 3-1/8?

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Link to the new woffer This is the woofer I chose to replace the originally JAMO with.

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Replacement of the woofer..

As it turned out, the ”Jamo item 20316 speaker” was the originally mounted woofer driver in the 7.7 and D590
Thanks to ”Boye” from – I got that nailed down.

But anyway, I was still in to replacing the woofer unit as the 10 years old drivers original suspension was porous and about to give up, and because the unit didn’t seams to match up to the cabinet and the rest of the driver stage.

So the search for a new woofer began and due to an excellent support from the SEAS vendor in Norway, I chose to go for a unit from their portfolio. Based on the cabinet volume (mainly VAS and QTS) and some driver data like Ohms and sensitivity we selected the H1288 unit (CA22RNX). This is a long stroke unit with great build and Free Air Resonance as low as 29Hz. This is super fine for a cost effective woofer.

I bought the unit from in the Nederland’s – and it was delivered in Denmark just 3 work days after closing the basket.

Even though the SEAS units metal basket are much bigger than the originally JAMO driver, the SEAS woofer match just perfect into the woofer slot in the cabinet. The originally driver was supported with a plastic ring to fit the unit to the cabinet, and in fact.. the woofer itself was NOT mounted by screws onto the cabinet, the plastic ring was… (picture on the ring on the previous page)

Below are some images comparing the two woofers:
One very special thing on the SEAS unit is the open coil design making room for ”long stroke action” I believe..

SO DOES THEY SOUND any better?
Excellent, much more control together with lower frequency output, they are capable of handling more power (at the time I had finished one of the speakers I compared to the originally one still awaiting for the upgrade) and I do think they suit the speaker better. I’m happy J

Just a note: If you are going to work on the speaker, count in to replace the terminals as the originally ones are very fragile. They are not soldered to the print board and if you tighten the nuts they will break over.

H1288-08 CA22RNX

Classical handcoated paper cone and matching natural rubber surround produce a
well behaved roll off characteristic and reduce potential resonance problems.

Long, high temperature voice coil wound on an aluminium voice coil former gives
low distortion and high power handling capacity.

Large magnet system provides high efficiency and good transient response.
Bumped backplate in the magnet system allows maximum utilization of the
long voice coil without mechanical limitation.

Extremely stiff and stable injection moulded metal basket keeps the critical
components in perfect alignment.

Large windows in the basket both above and below the spider reduce sound reflexion, airflow noise and cavity resonance to a minimum.

Inside the 707 series..

The drawing below shows the 707(n) version and not the 7.7 and D590 verions.
It’s fitted with 2 times 8? bass drivers mounted inside the cabinet in a push pull configuration.

Inside the 7.7 and D590

Below are some pictures taken of my lovely 7.7 speakers. It’s fitted by only one bass unit..
Like the D590 its mounted vertically in the bottom of the speaker.

Are this woofer, the “Jamo item 20316”, really the originally mounted bass driver in the 7.7?
It just seems to be too thin a bass driver to match up the rest of the speaker. The bass driver weight is only about 1010g. (2,23Ib) and to compare.. the midrange driver has a weight of 820g The new Woffer?

As you can see I’m running the speaker in a bi-amp setup. Funny thing is that the split is between the high / midd and low driver together.

Link to: The OFFICIAL Jamo Speaker Owner’s thread!

Link to: JAMO homepage


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