I told you, that fella was blown off his feet when listening to my speakers ...
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The horn works perfectly because it was designed by the manufacturer of the driver.
I have found that the "perfect" fullrange driver is this 5.7" driver in the correct horn, not an 8", 10" or larger.
The treble is so good that I have removed my Fostex super tweeters, as they are not needed and bring nothing to the party.
And the plans for the horn were included in the price of the drivers
I have found that the "perfect" fullrange driver is this 5.7" driver in the correct horn, not an 8", 10" or larger.
The treble is so good that I have removed my Fostex super tweeters, as they are not needed and bring nothing to the party.
And the plans for the horn were included in the price of the drivers
AlNiCo is one of the most stable magnet types at high temperatures, but is vulnerable to demagnetisation from other causes. Some of that is self-demagnetisation (hence the reason many used in loudspeakers are physically quite long relative to their pole area & to achieve the target flux density in the VC gap); others are due to susceptibility to external fields, or even physical blows. A loudspeaker permanent magnet structure can't always achieve the optimal form factor for the AlNiCo magnet taken independently as by nature this is constrained by the requirements of the overall driver design.
Be that as it may: if you handle the driver with reasonable care, avoid external fields as much as possible, it should be fine, and remain so for many years, although a decade or two down the line it may (may -varies with design & circumstance) require recharging.
Be that as it may: if you handle the driver with reasonable care, avoid external fields as much as possible, it should be fine, and remain so for many years, although a decade or two down the line it may (may -varies with design & circumstance) require recharging.
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I asked Istvan then gave me reply.
These speakers operate at low power and therefore they can be used
without conflicts for 15-20 years, the induction in the gap decreases by
about 5% and thus the Qts is increased by minimum percentage.
I am very interested in those speakers also field coil.
Field coil, only swr200,swr250,swr300.
For my small room,I am considering sfr145.
These speakers operate at low power and therefore they can be used
without conflicts for 15-20 years, the induction in the gap decreases by
about 5% and thus the Qts is increased by minimum percentage.
I am very interested in those speakers also field coil.
Field coil, only swr200,swr250,swr300.
For my small room,I am considering sfr145.
I own a pair of SFR-145 AlNiCo and they are even better than my ferrite SFR-175s
Alnico itself don't really demagnetize, it is the motor magnetic lines starts to break off due to handling like hammering the magnet, the adhesive that holds motor structure starts to weaken or corrosion to the yoke
Normally if the motor structure starts to gap due to due to aging, the magnetic line starts to lose its continuity, this is one reason why the magnetic gap loses strength.
Mostly happens on Alnico 5 and below, like LNG44...
Alnico 8 and 9 seldom has this issue as Coercive is higher, but Alnico 8 and 9 has size limitation when casted as they are very brittle.
Re-magnetizing helps to reset and make the yoke recreate magnetic lines within the steel martensitic crystal structure
Normally if the motor structure starts to gap due to due to aging, the magnetic line starts to lose its continuity, this is one reason why the magnetic gap loses strength.
Mostly happens on Alnico 5 and below, like LNG44...
Alnico 8 and 9 seldom has this issue as Coercive is higher, but Alnico 8 and 9 has size limitation when casted as they are very brittle.
Re-magnetizing helps to reset and make the yoke recreate magnetic lines within the steel martensitic crystal structure
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If the baffle is done correctly and the FR used above its mass corner, it should work well in an OB.
1st order XO might not work. MJK covers a lot of material in his passive OB article and i would suggest that is what you would be best to follow. He uses a split frequency 2nd order filter.
dave
1st order XO might not work. MJK covers a lot of material in his passive OB article and i would suggest that is what you would be best to follow. He uses a split frequency 2nd order filter.
dave