When I was replacing the tweeter on the second speaker, I noticed that the OEM tweeter was wired in reverse polarity. I had never removed this tweeter from the cabinet before and it was the OEM PSB tweeter so I assume either the previous owner pulled the tweeter out at some point and wired it backwards when reinstalling it or it could've come from the factory wired that way; either by mistake or on purpose.
I didn't really look at how the tweeter in the first speaker I did the tweeter swap/upgrade on was wired. I knew from looking at the crossover that the yellow wire was Pos+ and the blue wire was Neg- so I just pulled the wires off it without noting how it was wired and then I wired in the replacement tweeter with yellow to Pos+ and blue to Neg- without giving it another thought.
Is there a chance the factory/designer could have wanted the tweeters wired in reverse polarity to the woofers? Could there be any possible advantage to doing that? Lojzek? Anybody?
I didn't really look at how the tweeter in the first speaker I did the tweeter swap/upgrade on was wired. I knew from looking at the crossover that the yellow wire was Pos+ and the blue wire was Neg- so I just pulled the wires off it without noting how it was wired and then I wired in the replacement tweeter with yellow to Pos+ and blue to Neg- without giving it another thought.
Is there a chance the factory/designer could have wanted the tweeters wired in reverse polarity to the woofers? Could there be any possible advantage to doing that? Lojzek? Anybody?
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Hi @Lojzek , I also have PSB Image 2B speakers but I'd like to uprade to BS25C06-04 tweeter instead of BS25C08-04 that you designed it for. The reason is that I've heard more experiences of this driver on PSB Image line that mount the same stock tweeter, which is seemingly 4ohm, as DangerBoy pointed out. BS25C06-04 is 93.5 Sensitivity @ 1W/1m instead of the higher 96.3db of the BS25C08-04. Here are the graphs for BS25C06-04:
https://www.products-peerless.com/en/transducer/27
BS25C6-04 measures 96.5 db @ 2.83V/1m or 93.5 db @ 1W/1m.
Would you be so kind to re-calculate the series resistor ahead to pad down for equivalent response of the original tweeter? I found its model, it is TW1-2AN/P. Some users have used a 1.8 and 1.5 ohms value respectively with BS25C6-04 and this same speaker series, but I don't have measurement gear or multimeter.
https://www.parts-express.com/Peerless-BC25SC06-04-1-Textile-Dome-Tweeter-264-1028
Some useful measurements of my PSB image 2B:
https://www.soundstagenetwork.com/measurements/psb_image2b/
Some measurements by Stereophile of the equivalent PSB Image B25 (same stock tweeter)
https://www.stereophile.com/content/psb-image-b25-loudspeaker-measurements
They measure about 88db or 87.5db both at 2.83V/m
thanks in advance for any help!
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I've just found a recent thread of someone who measured the stock Vifa TW1-2AN/P tweeter impedance, it's about 5.3Ω instead of 4!
https://audiokarma.org/forums/index...crossover-issue-or-both.1049374/post-16867483
Can you re-calculate the resistor accounting for this value and BS25C6-04?🙏He also bought this tweeter, and doesn't know how much to put.
https://audiokarma.org/forums/index...crossover-issue-or-both.1049374/post-16867483
Can you re-calculate the resistor accounting for this value and BS25C6-04?🙏He also bought this tweeter, and doesn't know how much to put.
You are to use BC25SC06-04, so logically any simulation should be based on its own impedance profile,
which is already done, not any other one. Stereophile's review suggests overall sensitivity at 88 dB and this
value can be achieved as already mentioned. Your job is easy.
Find the resistor performing most reasonably by listening.
which is already done, not any other one. Stereophile's review suggests overall sensitivity at 88 dB and this
value can be achieved as already mentioned. Your job is easy.
Find the resistor performing most reasonably by listening.