Interesting... I consider myself a bit of an Infinity aficionado but I had never heard of these before now. Hopefully a schematic turns up for you. Probably more luck on audio asylum, karma, or one of the other classic speakers forums.
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I got these domes from ebay...I consider myself a bit of a dome aficionado 🙂
They are in good shape and I want to make nice bookshelf with them. So I was curious about the crossover points and slopes. I have searched with no luck so far. Well, I will do measure them myself.
They are in good shape and I want to make nice bookshelf with them. So I was curious about the crossover points and slopes. I have searched with no luck so far. Well, I will do measure them myself.
Keep us updated on what you find! I had a pair of polydomes for a long time that I really enjoyed. I only moved away from them when I got into directivity control. The matching dome material between the two looks nice. Since you don't have the original cabinets it could be fun to remove or trim the front plates off to get them closer together. If I remember correctly the basket behind the midrange is barely wider than the dome itself.
If you keep the front plates on they will certainly make for a very nice looking pair of bookshelves. A sealed 8" underneath and I think you will be a very happy camper.
If you keep the front plates on they will certainly make for a very nice looking pair of bookshelves. A sealed 8" underneath and I think you will be a very happy camper.
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I made some measurements on infinity domes. Not very happy with the mid dome, its less efficient than I expected, and its little lumpy in response. Tweeter is better, but it has nasty hump at 1.7kHz, which will need attention. I measured mid dome with 10uF protection cap, and tweeter with 2.2uF cap. Will need to cross it much higher than 1.7kHz.
Otherwise they sound clean, low distortion. Definitely will be more work on crossover than those HiVi domes I used before, those were ruler flat to start with.
Otherwise they sound clean, low distortion. Definitely will be more work on crossover than those HiVi domes I used before, those were ruler flat to start with.
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Thanks tuantran.
Are you absolutely sure about 300Hz?
I would never cross poor little frail mid dome lower than 900 Hz.
When it comes to the crossover, I will go b&o approach, use mid dome only as filler.
Are you absolutely sure about 300Hz?
I would never cross poor little frail mid dome lower than 900 Hz.
When it comes to the crossover, I will go b&o approach, use mid dome only as filler.
I found this information for ES-103 on internet.
Nominal Impedance: 8 Ohm
Power Rating: 200 watts
Efficiency: 102dB 1 watt@ 1 meter +/_ 2dB
Crossover Frequencies: 300Hz, 4KHz
Frequency Response: 47Hz - 22KHz
Nominal Impedance: 8 Ohm
Power Rating: 200 watts
Efficiency: 102dB 1 watt@ 1 meter +/_ 2dB
Crossover Frequencies: 300Hz, 4KHz
Frequency Response: 47Hz - 22KHz
300hz seems low for that mid. The 2" poly mids (albeit not polycell) in earlier models were usually 700 - 4000.
That mid is certainly less efficient than it is billed as, but more in line with what the infinity dome mids usually were like. With a simple crossover I can see how these were quite acceptable in the 80's. By today's standards they need a little work, as you said.
An AVR with room eq would probably do them justice.
That mid is certainly less efficient than it is billed as, but more in line with what the infinity dome mids usually were like. With a simple crossover I can see how these were quite acceptable in the 80's. By today's standards they need a little work, as you said.
An AVR with room eq would probably do them justice.
I searched hifiengine for similar infinity speakers, with mid domes, and they typically cross at 750 - 950 Hz.
However, I decided to scrap this project, that infinity dome is to much crap.
I will sell the tweeters and dump the mids. No need to waste my time with low quality ****.
However, I decided to scrap this project, that infinity dome is to much crap.
I will sell the tweeters and dump the mids. No need to waste my time with low quality ****.
Well, I abandoned the infinity domes project, mainly due to mid dome not performing up to my liking, but I decided to finish it in another form. I had Peerless dome, 5", which i used before. Even it looks like a dome, in reality, its not. It just pretends to be dome.
Point is, that infinity tweeter performed well, so it would be pity not to put it in some use.
Crossover is very simple, 0.5mH on mid dome, 4.7uF cap and 8 ohm resistor on tweeter. Tweeter is lot more efficient, but I do not mind small lift.
Here are some pictures.
Point is, that infinity tweeter performed well, so it would be pity not to put it in some use.
Crossover is very simple, 0.5mH on mid dome, 4.7uF cap and 8 ohm resistor on tweeter. Tweeter is lot more efficient, but I do not mind small lift.
Here are some pictures.
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Adason, I'd like to know the model of your measurement microphone. I guess it must be a good one. Thanks.
UMIC
its cheap yet well performing, and comes with calibration file which you can download and use in REW
UMIK-1/2 setup with REW
its cheap yet well performing, and comes with calibration file which you can download and use in REW
UMIK-1/2 setup with REW