Sheilded options for 2 way or 2.5 way

UK Dave · 4th April 2008, 02:27 PM

Hi

I'm looking for some advice on what 2 or 2.5 way design to build.

I'm looking towards a Zaph SR71, Jays Usher/Peerless, Ellam-XT, or something similar. i.e. stand mount, reasonable quality, proven design, using a pre-built cabinet.

Zaph SR71 (or Jays eqiv. design) - Seas ER18RNX / Seas 27TDFC - http://www.zaphaudio.com/SR71.html
Jays - Usher 8945P / Peerless 810921 HDS - http://www.geocities.com/woove99/Spk...Usher_2way.htm
Ellam-XT - Scan-Speak 15W/8530-K00 / Vifa XTt25TG (or D2904/9800) - http://www.troelsgravesen.dk/EllamXT.htm

One big issue I have is that due to room lay-out the speaker placement is next to a CRT TV, and I therefore need speakers to be shielded. These are only going to be used for music not HT

I've looked on various web sites and can't seem to find any information about the shielded qualities (or lack of) for these speakers.

If none are suitable can anyone suggest a similar set-up that uses shielded speakers.

Can anyone help ?

Dave

sdclc126 · 4th April 2008, 03:49 PM

Hey Dave,

Have you considered adding bucking magnets to the woofers?
Some probably would not do this, as there is some risk of altering the frequency response of the driver, but if you stay around 75% or less (anybody please correct if I'm off) of the driver magnet weight there is usually no problem.

sreten · 7th April 2008, 11:45 AM

Hi, Seas sell shielding kits for their drivers, so an option,

/sreten.

UK Dave · 20th April 2008, 07:57 PM

Thanks for the replies sdclc126/sreten

I've looked into this and checked with Seas. They don't make a kit for the ER18RNX driver. They explain it as follows......

"We do in fact not recommend shielding of such large magnet systems, simply because of the extra mechanical load that is added to the connection between the chassis and the magnet system."

With regards the bucking magnets, this could work, but may have issues as explained by Seas. Also I don't want to go through all the effort and cost of building these only to find I can't place them where I need them.

So it's back to the drawing board, currently Jim Griffins Jordan/Aurum Cantus G2Si Mini monitor is looking favorite.

Regards

Dave

rabbitz · 21st April 2008, 06:46 AM

Depends how close you want the speaker to a CRT. Never had a problem even within 300mm. Shielded drivers really limits your choices.

4th April 2008, 02:27 PM	#1
UK Dave diyAudio Member Join Date: Apr 2003 Location: Bristol	Sheilded options for 2 way or 2.5 way Hi I'm looking for some advice on what 2 or 2.5 way design to build. I'm looking towards a Zaph SR71, Jays Usher/Peerless, Ellam-XT, or something similar. i.e. stand mount, reasonable quality, proven design, using a pre-built cabinet. Zaph SR71 (or Jays eqiv. design) - Seas ER18RNX / Seas 27TDFC - http://www.zaphaudio.com/SR71.html Jays - Usher 8945P / Peerless 810921 HDS - http://www.geocities.com/woove99/Spk...Usher_2way.htm Ellam-XT - Scan-Speak 15W/8530-K00 / Vifa XTt25TG (or D2904/9800) - http://www.troelsgravesen.dk/EllamXT.htm One big issue I have is that due to room lay-out the speaker placement is next to a CRT TV, and I therefore need speakers to be shielded. These are only going to be used for music not HT I've looked on various web sites and can't seem to find any information about the shielded qualities (or lack of) for these speakers. If none are suitable can anyone suggest a similar set-up that uses shielded speakers. Can anyone help ? Dave

4th April 2008, 03:49 PM	#2
sdclc126 diyAudio Member Join Date: Jan 2005 Location: San Diego, CA	Hey Dave, Have you considered adding bucking magnets to the woofers? Some probably would not do this, as there is some risk of altering the frequency response of the driver, but if you stay around 75% or less (anybody please correct if I'm off) of the driver magnet weight there is usually no problem. __________________ Soft Dome

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7th April 2008, 11:45 AM	#3
sreten diyAudio Member Join Date: Nov 2003 Location: Brighton UK	Hi, Seas sell shielding kits for their drivers, so an option, /sreten.

20th April 2008, 07:57 PM	#4
UK Dave diyAudio Member Join Date: Apr 2003 Location: Bristol	Thanks for the replies sdclc126/sreten I've looked into this and checked with Seas. They don't make a kit for the ER18RNX driver. They explain it as follows...... "We do in fact not recommend shielding of such large magnet systems, simply because of the extra mechanical load that is added to the connection between the chassis and the magnet system." With regards the bucking magnets, this could work, but may have issues as explained by Seas. Also I don't want to go through all the effort and cost of building these only to find I can't place them where I need them. So it's back to the drawing board, currently Jim Griffins Jordan/Aurum Cantus G2Si Mini monitor is looking favorite. Regards Dave

21st April 2008, 06:46 AM	#5
rabbitz diyAudio Member Join Date: Jul 2003 Location: Newcastle, Australia	Depends how close you want the speaker to a CRT. Never had a problem even within 300mm. Shielded drivers really limits your choices.

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