Gc + Frs 8

jemraid · 24th May 2005, 07:20 PM

I am going to build a pair of Cyburg's Needles with the Visaton FRS 8 drivers.

There are two versions of the driver one 4 Ohm and one 8 Ohm, the 4 Ohm one has got a higher QTS making it more suitable for the Needle.

I'm sure I have read that an inverted LM3875 GC is suitable for a 4 Ohm load but would like to check.

Would be grateful for any help.

Regards - Jem

G4ME · 24th May 2005, 08:40 PM

just as long as you don't exceed the current output limit. Which means a transformer of around 18-20V

carlosfm · 24th May 2005, 09:01 PM

An LM3886 would be better.

G4ME · 24th May 2005, 09:09 PM

as it allows higher current output

jemraid · 24th May 2005, 09:27 PM

Dear Carlosfm and G4ME,

I think I'll buy the 8 Ohm version I don't want to blow me lovely amp up.

Thanks for the advice

Jem

G4ME · 24th May 2005, 09:36 PM

you will be fine with the 3886, its rated for 4 ohms even with a tranny of 25V. Heck you could still use the 3875 with 25v tranny, i just wouldn't crank it to 11.

24th May 2005, 07:20 PM	#1
jemraid diyAudio Member Join Date: Aug 2004 Location: NE Derbyshire	Gc + Frs 8 I am going to build a pair of Cyburg's Needles with the Visaton FRS 8 drivers. There are two versions of the driver one 4 Ohm and one 8 Ohm, the 4 Ohm one has got a higher QTS making it more suitable for the Needle. I'm sure I have read that an inverted LM3875 GC is suitable for a 4 Ohm load but would like to check. Would be grateful for any help. Regards - Jem

24th May 2005, 08:40 PM	#2
G4ME diyAudio Member Join Date: Jun 2003 Location: Location: Location	just as long as you don't exceed the current output limit. Which means a transformer of around 18-20V __________________ Two little mice fell in a bucket of cream. The first mouse quickly gave up and drowned. The second mouse, wouldn't quit. He struggled so hard that eventually he churned that cream into butter and crawled out.

24th May 2005, 09:09 PM	#4
G4ME diyAudio Member Join Date: Jun 2003 Location: Location: Location	as it allows higher current output __________________ Two little mice fell in a bucket of cream. The first mouse quickly gave up and drowned. The second mouse, wouldn't quit. He struggled so hard that eventually he churned that cream into butter and crawled out.

24th May 2005, 09:36 PM	#6
G4ME diyAudio Member Join Date: Jun 2003 Location: Location: Location	you will be fine with the 3886, its rated for 4 ohms even with a tranny of 25V. Heck you could still use the 3875 with 25v tranny, i just wouldn't crank it to 11. __________________ Two little mice fell in a bucket of cream. The first mouse quickly gave up and drowned. The second mouse, wouldn't quit. He struggled so hard that eventually he churned that cream into butter and crawled out.

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24th May 2005, 09:01 PM	#3
carlosfm Banned Join Date: Mar 2003 Location: Lisbon, Portugal	An LM3886 would be better.

24th May 2005, 09:27 PM	#5
jemraid diyAudio Member Join Date: Aug 2004 Location: NE Derbyshire	Dear Carlosfm and G4ME, I think I'll buy the 8 Ohm version I don't want to blow me lovely amp up. Thanks for the advice Jem

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