New member with Polk sda srs2.3tl speakers, good story and questions....
Comments
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Well its been a minute since I acquired these, these were a chance acquisition and at the time i had other projects going I need to finish up and some downsizing i needed to do to make room for these ole girls, well that time has come and I am ready to role up my sleeves and dig into these.
First priority is to order the 6 new tweeters and the four new midwoofers needed to replace bad ones, replacing the grill and side trim panel cloth, and prepping and spraying the top and bottom wood trim panels satin black ( this is do to trim panels being oak on one speaker and walnut on the other) eventually as money allows i would like to recap the crossovers.
Since acquiring these I have added a Conrad Johnson pv7 tube pre amp to my main rig, this is a very clean, clear and detailed sounding pre amp and should match up well with the polks i am thinking, I am still planning on using my pair of Sherwood AM7040 dual mono mosfet amps in a vertical biamp fashion, using one amp for the right and left top channels and one amp for the right and left bottom channels, my amps are common ground but a question I have is, when biamping in this fashion does using the sda cable show the bottom end and top end the same ground thus casuing a problem using the sda cable?
I will be ordering the new drivers first of the week and starting on the cabinets in the coming days, I will be posting pictures and progress reports as i go, I am looking forward to when i will be able to sit down and enjoy these big boned ole girls
Chris -
Also just wanting to confirm, the tweeters to replace the sl3000 ones are the RD0198, and the mid bass replacements are MW6510 correct?
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Yes.vintagchris wrote: »Also just wanting to confirm, the tweeters to replace the sl3000 ones are the RD0198, and the mid bass replacements are MW6510 correct? -
My new drivers arrived yesterday, I would like to give a shout out to the good folks over at polk and thank them for their help and timely delivery and of course the member discount was greatly appreciated!
I spent yesterday afternoon going threw the speakers, removed the four original mid woofers in each speaker and tightened the lead connections and double checked the wiring, installed the four new mid woofers and six new tweeters, I still need to replace the grill and side trim cloth but I didn't care for the quality of the grill cloth the local fabric store had, probably just order some online, and I still haven't decided which way I am going as to the mismatched trim panel issue (one speaker having oak trim the other walnut) I contemplated just prepping them and shooting them black, another option is make new ones from solid stock, I stopped at one of our local lumber yards that caters to the custom high end builders and he showed me some rough cut lumber, stuff like basic oak and walnut and various exotics, nice thing is they are all rough cut some thick as three inches and can be custom planed down to whatever thickness I choose, allowing me to keep a nice thick profile, still on the fence at the moment though which way I am go, the speakers are so freakin large you really don't see anything but edge profile of the trim anyway so exotics would kinda be a waist as no ones really gonna see much of them anyway, which has me thinking maybe just spraying them black, I am going to replace the grill and side trim cloth for now and live with them for a minute before i decide.
My first listening impressions the speakers exceeded my expectations, when i first got these I listened to them briefly in their very much diminished form, they had four blown mid woofers and four blown tweeters, I had temporarily swapped in two tweeters and two woofers from a pair of model 7s I happened to have, even in their diminished form they still gave me a taste of what they could be be, at the time a guy came over to buy an audio piece I was selling and had put some doubt in my mind saying they had no midrang and were not worth putting the money into, I am happy to report that observation on his part was wrong! from top to bottom these speakers now have a very nice tonal balance, great imaging and detailed large sound stage, these have that large sound you get from designs like columbner arrays and multiple driver designs which I am partial to.
currently I am running the speakers in my test rig on a carver c1 pre amp, yamaha p2200 amp, the yamaha putts out 350 watts pc at 4 ohms, my ultimate goal is after the tweeters break in for a bit, I am wanting to move them over to the main rig and run them on my conrad johnson pv7 tube pre amp and a pair of sherwood AM7040 dual mono mosfet amps rated at 350 watts per channel at a four ohm load in a vertical bridged configuration, this should put out ro 700 watts per side, hopefully not over the top power wise, the sherwoods are a common ground amp but I am still trying to figure out if I vertical biamp and use one amp for the top end one amp for the bottom end will using the the sda cord be a problem? -
Your speakers are 6 ohm, not 4.in a vertical bridged configuration
You mean vertical bi-amp configuration, right?the sherwoods are a common ground amp but I am still trying to figure out if I vertical biamp and use one amp for the top end one amp for the bottom end will using the the sda cord be a problem?
As long as you are positive that the "low" amp is common ground then you should be ok.Political Correctness'.........defined
"A doctrine fostered by a delusional, illogical minority and rabidly promoted by an unscrupulous mainstream media, which holds forth the proposition that it is entirely possible to pick up a t-u-r-d by the clean end."
President of Club Polk -
sorry yes i meant vertical bi amp, and both amps are the same model I will be using, another concern I have is throwing 350 watts to the top end of these and over driving the new tweeters, I don't want to do the same thing the previous owner did which is over power them, he was bridging two adcomb gfa 555 amps though rated at 800 watts bridged at 8 ohms and as these are four ohm speakers I am guessing he was putting ro 1400 watts to each side, so whether the three tweeters in each speaker can live comfortably with 350 watts is a concern, I realize the speakers as a whole are rated at 800 watts max but I assume the 6 mid woofers in each speaker verses the 3 tweeters would need the lions share of the power.
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Google "amplifier distortion, DC-offset, and you" and read the AK forum on this topic. It covers testing and ideal ranges.
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I'd be stunned if the Adcom '555 could throw 1400 watts bridged into 4 ohms. I bet the 4-ohm rating isn't much higher (if at all higher) than the 8-ohm rating.vintagchris wrote: »he was bridging two adcomb gfa 555 amps though rated at 800 watts bridged at 8 ohms and as these are four ohm speakers I am guessing he was putting ro 1400 watts to each side, so whether the three tweeters in each speaker can live comfortably with 350 watts is a concern, I realize the speakers as a whole are rated at 800 watts max but I assume the 6 mid woofers in each speaker verses the 3 tweeters would need the lions share of the power.
First Guess: The drivers were popped because the previous owner over-drove the bridged '555s into a 4-ohm load when it's not rated for 4-ohm duty when bridged. Not a matter of "too much" power, as "too little" amplifier--it couldn't take the current draw so it distorted.
Second Guess: Yes, the mid-woofers will need the lion's share of the power. 350 "real" watts to the tweeters will make the domes fly across the room; or the voice-coils will melt. -
he was bridging two adcomb gfa 555 amps though rated at 800 watts bridged at 8 ohms and as these are four ohm speakers I am guessing he was putting ro 1400 watts to each side,
Again, they are SIX ohm speakers, not four. Those amps are not rated to drive less than an 8 ohm load when bridged.Not a matter of "too much" power, as "too little" amplifier--it couldn't take the current draw so it distorted.
Bingo.Political Correctness'.........defined
"A doctrine fostered by a delusional, illogical minority and rabidly promoted by an unscrupulous mainstream media, which holds forth the proposition that it is entirely possible to pick up a t-u-r-d by the clean end."
President of Club Polk -
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And the Handbook says Compatible with 8 ohm outputs. Page 10OOOoops. I should have caught that.POLK SDA 2.3 TLS BOUGHT NEW IN 1990, Gimpod/Sonic Caps/Mills RDO-198
POLK CSI-A6 POLK MONITOR 70'S ONKYO TX NR-808 SONY CDP-333ES
PIONEER PL-510A SONY BDP S5100
POLK SDA 1C BOUGHT USED 2011,Gimpod/Sonic Caps/Mills RDO-194
ONKYO HT RC-360 SONY BDP S590 TECHNICS SL BD-1 -
The 555 is not wanting for current.It can actually drive a 2 ohm load in stereo mode.It's actual rating in bridged mode into 4 ohm's is 850w.
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Which in effect means "Less than 8 ohms, but we don't really want to get more specific."And the Handbook says Compatible with 8 ohm outputs. Page 10
The 555 was not rated for bridged use into a 4-ohm load. The 555 II is rated for bridged use into a 4-ohm load, at 850 watts vs. 600 into 8 ohms. One assumes that bridged use into a 4-ohm load would be an operating condition that suggests use of the optional fan-cooling.The 555 is not wanting for current.It can actually drive a 2 ohm load in stereo mode.It's actual rating in bridged mode into 4 ohm's is 850w.
http://www.adcom-usa.com/userguides/gfa-555-ug.pdf
http://www.adcom-usa.com/userguides/gfa-555ii-ug.pdf
1400 watts as suggested earlier is completely out-to-lunch. -
Apparently it was atleast in the sales brochure. http://www.bobbyshred.com/infinity/adcom555.htmlThe 555 was not rated for bridged use into a 4-ohm load.
Yes ofcourse and my point of posting the 850 figure.However both variants are very capable of delivering high current into low impedances.1400 watts as suggested earlier is completely out-to-lunch.
Yes thermal stress can become an issue when bridging and trying to drive difficult loads to high levels. -
Yup, you're right. Not listed in the owner's manual, but clearly spec'd in the brochure at the same power level as the later 555 II.Apparently it was atleast in the sales brochure. http://www.bobbyshred.com/infinity/adcom555.html
