Tweeters?

ThSpeakerDude88 · 19th January 2006, 12:04 AM

Well I have a pair of Sansui Sp-1500's that I have restored. I accidentally blew all four 1 inch metal dome tweeters one day while working under my desk. The amp was on and up half way and I accidentlly unplugged the source.. needless to say it fried all four coils.

I can't seem to find a set anywhere, I have checked ebay but without any luck. The tweeter domes themselves are easy to replace or recoil, but I have no idea where I would get replacment diaphragms, or if the domes can actually be recoiled.

They are 16 ohms each, run in paralell to equal 8 ohms.

I was thinking about getting four of these http://www.partsexpress.com/pe/showd...number=279-082

and wiring two in series in each cabinet to make 8 ohms.

I was wondering what your sugguestions are and what you think of this particular tweeter. Also, is there a way to be able to use 8 ohm tweeters in this? It would make tweeter selection a little easier, as I might be able to get some with replaceable diaphragms.

when I get replacment tweeters, especially if their originals, I am going to put inline fuses with them to prevent further mishaps!!

any reccomendations on what type of fuse to use also?

ThSpeakerDude88 · 19th January 2006, 04:21 AM

any ideas

Tomac · 19th January 2006, 06:22 AM

Combination of two 8ohm drivers will give either 16 or 4 ohms , depends on way you wire them (but I guess you knew that). It is not a problem ,them being a different impendance, but this requires changing some values in crossover. That driver you gave link for seems ok and honestly I don't think these speakers deserve better than that. If the faceplate of driver and baffle cutout fit together I can't see a reason not to go for it. I guess the highpass filter is set high so any proper sounding tweeter would fit in. You only have to take care of sensitivity, don't know what was the sensitivity of original tweeters.

ThSpeakerDude88 · 19th January 2006, 06:24 AM

thats the one thing I was worried about, these speakers are very efficient. I believe 99db is what the old ad's say.

Maybe thats why they had two tweeters in each cab, to make it more efficient?

as long as they will sound like they did before I'll be happy, as they sound wonderful

sreten · 19th January 2006, 08:48 AM

Hi,

8 ohm tweeters would be difficult use without modifications to the
crossover. In low efficiency speakers it would be possible to pad
the 8 ohm combo back to an eight ohm pair but in your case I don't
think this a sensible proposition.

Your proposition for the Peerless tweeters appears entirely sensible.
At that price opinions on the sound quality of the tweeter are pointless.
But I'd suggest they probably will be better than the old tweeters.

Fuses on tweeters I haven't seen for a long time.
I suggest you investigate Polyswitches.
If the Peerless units use ferrofluid they will be very robust.

/sreten.

ThSpeakerDude88 · 19th January 2006, 01:08 PM

alright, its only $35 so its not completly breaking the budget. Besides, if I come across an original pair on ebay later on I can grab them. Do you think sensativity will be an issue?

just a thought, but I can't seem to find many 4 ohm tweeters out there. Are there any others you can think of ?

sreten · 19th January 2006, 01:47 PM

Quote:

Originally posted by ThSpeakerDude88
Do you think sensitivity will be an issue?

I'd be very surprised if it was,

/sreten.

ThSpeakerDude88 · 19th January 2006, 02:02 PM

LOL ok. As long as I keep my 99db sensativity I'll be fine, as I like to use my lower wattage amps on these (because they sound so good!)

I am looking for a nice Marantz 2235b to power them so I want to keep the effiency.

ThSpeakerDude88 · 20th January 2006, 01:08 AM

heres a pic of one of them, you can see the metal dome tweeters with their screens removed.

heres a pic w/ screens on.

sreten · 20th January 2006, 09:13 AM

Hi,

the two Peerless tweeters in series will pan out at 93dB/W.

in a 3-way speaker a 93dB/W tweeter would be used
with a 93dB/W midrange and a 99dB/W bass unit.
I'm presuming this is where your 99dB/W has come from.

A speaker with flat response and a genuine 99dB/W
midband sensitivity would need a 105dB/W bass unit.
I'm presuming this it not the case for your speakers.

/sreten.

19th January 2006, 12:04 AM	#1
ThSpeakerDude88 diyAudio Member Join Date: Jun 2005 Location: USA	Tweeters? Well I have a pair of Sansui Sp-1500's that I have restored. I accidentally blew all four 1 inch metal dome tweeters one day while working under my desk. The amp was on and up half way and I accidentlly unplugged the source.. needless to say it fried all four coils. I can't seem to find a set anywhere, I have checked ebay but without any luck. The tweeter domes themselves are easy to replace or recoil, but I have no idea where I would get replacment diaphragms, or if the domes can actually be recoiled. They are 16 ohms each, run in paralell to equal 8 ohms. I was thinking about getting four of these http://www.partsexpress.com/pe/showd...number=279-082 and wiring two in series in each cabinet to make 8 ohms. I was wondering what your sugguestions are and what you think of this particular tweeter. Also, is there a way to be able to use 8 ohm tweeters in this? It would make tweeter selection a little easier, as I might be able to get some with replaceable diaphragms. when I get replacment tweeters, especially if their originals, I am going to put inline fuses with them to prevent further mishaps!! any reccomendations on what type of fuse to use also?

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19th January 2006, 04:21 AM	#2
ThSpeakerDude88 diyAudio Member Join Date: Jun 2005 Location: USA	any ideas

19th January 2006, 06:22 AM	#3
Tomac diyAudio Member Join Date: Dec 2003 Location: Zagreb	Combination of two 8ohm drivers will give either 16 or 4 ohms , depends on way you wire them (but I guess you knew that). It is not a problem ,them being a different impendance, but this requires changing some values in crossover. That driver you gave link for seems ok and honestly I don't think these speakers deserve better than that. If the faceplate of driver and baffle cutout fit together I can't see a reason not to go for it. I guess the highpass filter is set high so any proper sounding tweeter would fit in. You only have to take care of sensitivity, don't know what was the sensitivity of original tweeters.

19th January 2006, 06:24 AM	#4
ThSpeakerDude88 diyAudio Member Join Date: Jun 2005 Location: USA	thats the one thing I was worried about, these speakers are very efficient. I believe 99db is what the old ad's say. Maybe thats why they had two tweeters in each cab, to make it more efficient? as long as they will sound like they did before I'll be happy, as they sound wonderful

19th January 2006, 08:48 AM	#5
sreten diyAudio Member Join Date: Nov 2003 Location: Brighton UK	Hi, 8 ohm tweeters would be difficult use without modifications to the crossover. In low efficiency speakers it would be possible to pad the 8 ohm combo back to an eight ohm pair but in your case I don't think this a sensible proposition. Your proposition for the Peerless tweeters appears entirely sensible. At that price opinions on the sound quality of the tweeter are pointless. But I'd suggest they probably will be better than the old tweeters. Fuses on tweeters I haven't seen for a long time. I suggest you investigate Polyswitches. If the Peerless units use ferrofluid they will be very robust. /sreten.

19th January 2006, 01:08 PM	#6
ThSpeakerDude88 diyAudio Member Join Date: Jun 2005 Location: USA	alright, its only $35 so its not completly breaking the budget. Besides, if I come across an original pair on ebay later on I can grab them. Do you think sensativity will be an issue? just a thought, but I can't seem to find many 4 ohm tweeters out there. Are there any others you can think of ?

19th January 2006, 02:02 PM	#8
ThSpeakerDude88 diyAudio Member Join Date: Jun 2005 Location: USA	LOL ok. As long as I keep my 99db sensativity I'll be fine, as I like to use my lower wattage amps on these (because they sound so good!) I am looking for a nice Marantz 2235b to power them so I want to keep the effiency.

20th January 2006, 01:08 AM	#9
ThSpeakerDude88 diyAudio Member Join Date: Jun 2005 Location: USA	heres a pic of one of them, you can see the metal dome tweeters with their screens removed. heres a pic w/ screens on.

20th January 2006, 09:13 AM	#10
sreten diyAudio Member Join Date: Nov 2003 Location: Brighton UK	Hi, the two Peerless tweeters in series will pan out at 93dB/W. in a 3-way speaker a 93dB/W tweeter would be used with a 93dB/W midrange and a 99dB/W bass unit. I'm presuming this is where your 99dB/W has come from. A speaker with flat response and a genuine 99dB/W midband sensitivity would need a 105dB/W bass unit. I'm presuming this it not the case for your speakers. /sreten.