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In Reply to: RE: More to this than I thought. posted by Crazy Dave on October 13, 2016 at 07:02:11
Greetings from Sactown, Maxhifi. Have had several 'sui speakers pass through audio arsenal, & found they all benefited from utilizing simple capacitor crossovers in lieu of stock x-over net to sound expressive-n-expansive. Got a pair of SP-2500s from Audio Karma's Robisme, which had no bass thump a'tall stock. Replaced stock 10 uf mid-squalker x-over cap with 12 uf Dayton polyprop, & wired mids in series since they were similar. Since there was tweet eq contour for either 4.7 uf or 2.2 uf, decided to put 4.7uf Dayton polyprop on bottom tweet, & 2.2 uf Dayton polyprop on top tweet. Sounds sweet with Superscope R-1240 amplification, & doesn't want for Winterlandish volume when needed. Oh yeah, replaced thin stock internal wiring with 16 gauge. ... Got a pair of SP-1500s from a guitar geek bud, which had sat in a closet for damn near two decades. Since mids were different sizes, put a 10 uf Dayton polyprop on larger mid, & 6.8 uf Dayton polyprop on smaller mid (6.8 uf was stock mid x-over, wired to both mids; giving each mid its' own x-over cap cleared up that slightly congested stock sound), 4.7 uf Dayton polyprop went on mid tweet, & 2.2 uf Dayton polyprop went on flank tweet. Semper Fi recipient loves them pups, powered by Sony STR-6055 amplification. Wife loves 'sui's Kabuki countenance. A pair of AS-100s needed a mere 4.7 uf Dayton polyprop tweet x-over replacement to sound sensational with Rotel RX-602 amplification. Neither the 1500s nor the AS-100s needed stock wiring upgraded. ... Had a pair of latter generation 'sui Classique 900s, & replaced stock woof with Titan kicker from late, lamented Marvac. Was used to generate studio reverb for KDVS'"Live In Studio A" series. ... 'Sui speakers were beautiful bruisin' house rockers back-in-da-daze, maxhifi. Freeing 'sui drivers from their constrictive stock x-overs helps them sound as beautiful as they look. They also sound exquisite with home theatre audio, too. So go simple, & go 'sui!!! 73s para Sactown
Follow Ups:
I remember you posting this on the Vintage Asylum some years ago. It should work with the SP-2000, since the midrange layout is similar. The 2000's are parked right now. Your mod is simple, cheap and reversible. Sounds like an easy thing to try. They were rocking speakers when I had them hooked up. It doesn't take much power for them to blast. IMO, even stock, they are a much better sounding speaker than Klipsch Heresy, which I also own.
Dave
"even stock, they are a much better sounding speaker than Klipsch Heresy, which I also own."
Wow now this is encouraging! I really excited to get mine operational!
Those crossover modifications sound interesting too - did you compare it to the original crossovers with original components, or to rebuilt original crossovers? I need beg/borrow/buy some sort of calibrated mic before I go down that path though. I've done before/after recap frequency response plots of other 1970s speakers when I had access to a calibrated mic and the difference is not subtle.
Changed x-overs out of curiosity, maxhifi. Was amazed by increase in clarity-n-clout in modded vs stock. Unlike SP-2500s, SP-1500s already had decent bass response. Adding 10 uf polyprop to larger Coral mid driver solidified nether region, whilst unleashing robust alnico mids (unleashing robust mids is why SP-2500s' squalkers were wired in series, too). Was raised with that guitarist's "Get thy tone from thy amp" mentality, & applied it to hi-fi hobby. Keep us posted on how your modded SP-3005s sound compared to your La Scalas. 73s para Sactown
I really like the sound of your approach, I wish I could work that sort of magic working empirically! will definitely post back with impressions of the completed rebuild! I will probably not modify crossovers from stock without a microphone and measurement software to check my work, but I don't really trust me ears enough :) my fear is I would alter the tone to suit one type of music and ruin it for others. I am from an engineering background, not a musical one, soI feel like my judgement is better when I can quantify it somehow. I envy the sort of people who can adjust the speed of a turntable by ear, I'm the type who can notice when it's wrong but needs equipment to get it right.
I have read a lot of reviews of the old Sansui speakers online, and the positive ones all seem to speak about a very large sound, which is something I really enjoy. Negative ones talk about them making a lot of sound, but not a good sound. Reading between the lines, I am quite hopeful that these will do it for me, based on my own musical and sound system related preferences, and the simulations I have done to date.
I hurt my back fairly badly on the weekend doing some home repairs, and am only now back up to the task of using the table saw and wood working tools... Will post a pic when I am done.
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