Y2alstott Posted June 18, 2010 Share Posted June 18, 2010 I came across a pair of these locally. Not in great condition but serviceable. Does anyone know anything about these things? I can't seem to find anything on them that say whether they are good for something or not. Let me know what the story is with these things. Thanks, Nick Quote Link to comment Share on other sites More sharing options...
Fjd Posted June 18, 2010 Share Posted June 18, 2010 For home use they would probably have a low WAF; however, the 1233 is a musical sound portable loudspeaker system with the following specs: FR: 50-20kHz, vented Power: 120 watts, 8 ohms Sensitivity: 100.5 dB SPL Dimensions: 33"H X 28"W X 19"D, 112 lbs Components: 421-8LF, 811B horn, 808-8B driver 1233 xover (1200 Hz dual LC network). http://www.altecpro.com/pdfs/vintage/SpeakerAndMics/systems/1233%20Speaker%20System.pdf You could also try the Lansing Heritage site or the Altec forum on Hostboard for more specific information/opinions. Quote Link to comment Share on other sites More sharing options...
djk Posted June 19, 2010 Share Posted June 19, 2010 100.5dB @ 4' = 102.2dB @ 1M These are very loud, and easy to drive (8R vs most Klipsch having a 4R woofer). They don't have any real bass, nor can they play loud in the bass even if you boost the bass with an EQ (very short x-max on the woofer). No real high end from the 808 driver. A good PA speaker for vocal music, would probably be OK for a garage type system for a small amplifier (tubes, or a T-amp). Quote Link to comment Share on other sites More sharing options...
Y2alstott Posted June 23, 2010 Author Share Posted June 23, 2010 I may have to change my mind on this one. I just found some Altec Valencia 846b's. They look a lot nicer and they from what I have read they are pretty decent. Anyone know about these. Quote Link to comment Share on other sites More sharing options...
Y2alstott Posted June 27, 2010 Author Share Posted June 27, 2010 I passed on the 1233's and picked up a very nice pair of Valencia 846b's. So far they are very impressive. Mid and lows are absolutely amazing but the highs can be very bright. What does that pot on the back of the speaker actually do? Does it affect the quality of sound? Quote Link to comment Share on other sites More sharing options...
djk Posted June 27, 2010 Share Posted June 27, 2010 The pot on the back changes the level above the crossover point. The problem is that people use it to adjust the HF balance, but this generally leaves the speaker sounding very forward. The best way is to adjust it for the best midrange transition from the woofer, and add a HF bypass cap around the pot (it will sound a bit soft otherwise). The best solution might be to build Model 19 crossovers (which have both a mid and an HF control). http://www.audioheritage.org/vbulletin/showthread.php?25765-Driver-replacement-for-Altec-Valencias&highlight=846B Ultimately you may want to replace the 806 with a 902 for the best HF response. For a cheap way out, try a 40µH inductor wired in series with a 2.2µF capacitor. Hook the other end of the capacitor to terminal #3 of the L-pad (on the diagram below) and the other end of the inductor to terminal #2 of the L-pad (same diagram). This will gradually boost the highs above 4Khz, and remove all attenuation at 18Khz.This will require the L-pad to be set very low for best midrange balance. These are the HF EQ values from networks for the JBL 4430, 4435 studio monitor (2µF and 2.5µF respectively). http://www.audioheritage.org/vbulletin/attachment.php?attachmentid=40842&stc=1&d=1248210653 Quote Link to comment Share on other sites More sharing options...
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