All systems go !
All systems go !
DRIVE UNITS BY MANUFACTURER:
SB16PFCR25-8
UK STOCK ITEM
The SB16PFCR25-8 by SB Acoustics is a 6 inch 8 ohm midwoofer speaker featuring a blended paper fibre cone, a vented reinforced plastic chassis and an optimised motor system with a high power ferrite magnet. Very smooth extended response with good transients; the performance is exceptional at this price point.
Also available in 4 ohms: SB16PFCR25-4.
Resonant frequency (fs) | 38 Hz | Nominal impedance (Zn) | 8 Ω |
Mechanical Q factor (Qms) | 2.50 |
DC resistance (Re) | 5.6 Ω |
Electrical Q factor (Qes) | 0.48 |
Max power handling | 40 W |
Total Q factor (Qts) | 0.40 |
Sensitivity (2.83V/1m) |
87dB |
Equivalent volume (Vas) | 27L |
Chassis diameter |
176mm |
This 6.5" woofer is really nicely built for the money and easy to use. The response is pretty flat and in a 23 cm wide baffle only exhibited about 3dB of baffle step, meaning a smaller inductor of just 1.3 mH could be used.
Used it in a vented design in 14.5 litres, Fb=38Hz, giving a measured F3 of 60 Hz. I paired it with Audax TW025A0 crossing at around 2.5 kHz. The breakup is pretty easy to deal with using a parallel RC tank across the inductor.
I have no complaints about the sound, with vocals being clear and bass extension acceptable and punchy given the small motor. Achieves reasonably good volumes in a smallish room such as a study. Absolute bargain!
Thanks for the comprehensive review David!
Will & Caroline
Initially intended for a centre speaker in an MTM but ended up in an atmos build with a SB26 005 tweeter . Measurements in a test box resulted in parts ordered from Will and the build . Its not the most efficient driver going with a final 84-85dB at 1m1 watt due to a relative high XO in a two way and BSL. Be prepared to attenuate the tweeter a fair bit to get to 84 dB in a two way . Measuring in a 14 litre stuffed 220mm wide sealed box gave very close correlation for the two drivers ordered. 4 parts in the XO and the measured FRD was near ruler flat from 72Hz to 1KHz (+/_ 1.5 dB, 1/12th smoothed outside ) .. Crossed 2nd order at 2K summed well with 3rd order Tweeter . Waterfall was as smooth as they come .. All looks great at this stage .. Until you come to play some music through them .These are thin , really really detailed, but thin. Getting a match with 90dB speakers needs to volume up by 6-8 dB . Swapped with some Peerless 830657's and these gave more mid range wholesomeness and bass . The sealed box gives good roll off bottom end with F3 at 63hz . No sign of the resonance hump as indicated in the manufacturers FR when tested. The speaker did not fair as well as the Peerless drivers for vertical off axis measurement , horizontally identical , but vertical especially above tweeter axis and the SBA suffers 10 degrees above tweeter axis with XO dropout . Perhaps a NF monitor best use ? Usual great service from Will and the team . Pack and delivery 1st class as per.
Thankyou for your review !
Will & Caroline
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Absolutely first class service again brilliant advice as i always get from Will. Bought some Morel CAT 328-110 Tweeters and they sound sublime and the detail is incredible. Not harsh at all and very airy performs well beyond its price point im so glad Will advised me on this as the perfomance is fantastic. In fact Will has saved me thousands as replacing drivers has saved me investing in new speakers first class service once again.
Very happy customer thansk again.
Up and running again exactly what I needed. Great job Willys. 10/10👊🏻🫵🏻. From start to finish will be use again in near future for crossover upgrade. 1st time using. 100% will use again
Since 1991, I've had Linn Keilidh speakers, which I upgraded a year later to an active system using the Linn Wakonda and two LK100 power amplifiers. Over the past few years, I’ve considered replacing my audio setup with a more compact active system. However, the downside is that it would require a significant investment to achieve a comparable sound quality.
In the end, I opted for an upgrade of the tweeters and new speaker covers after more than 30 years.
The upgrade itself went smoothly using the supplied solder. I’m very pleased with the end result. The upgrade has had a noticeable impact on the soundstage: the bass, midrange and treble all have more space and clarity within the stereo image. This first became apparent to me when listening to vocals—it’s as if you can perceive the space surrounding the voice. And the longer you listen, the more this spatial detail stands out.
I’ve turned the amplifier up slightly, as creating that sense of space seems to require a bit more power.
It’s an upgrade I can definitely recommend.
Wow, just had my Mission 753 upgrades of crossover and also tweeters. What a difference it’s made! The high frequencies are more refined and OMG, the separation and richness of mud and bass if awesome…..much thanks to Willy’s for giving my 753’s a new life 😀😀
Excellent advice from will as usual and exactly what I wanted. These have improved the sound of my current speakers and taken them to another level. Sounds superb I can hear tonal difference's between things that I never heard before. Superb bass drivers dig so deep.
As usual will has been outstanding.
Brilliant to deal with always helpful and gives great service.