REDCATT35FR-1
£13.17 · 48% less, betterFs67 Hz −8%
Qts0.34 −6%
Vas1.6 L +12%, worse
BL5.5 T·m +27%, better
Xmax0.55 mm −92%, worse
Sensitivity83.2 dB –
3.5-inch LF driver · SLS series · 30 W
Peerless SLS-85S25CP04-04 4Ω
4 Ω
£25.30
SteadySoundImports · 421 in stock · Ships from Netherlands · All 3 offers
- Fs
- 73Hz
- Xmax
- 6.5mm
- SPL
- 84dB
- Pe
- 30W
- BL
- 4.3T·m
- Vd
- 21cm³
- Qts
- 0.36
- Vas
- 1L
Peerless SLS-85S25CP04-04 is a 3.5-inch 4 ohm LF driver rated at 30 W RMS. The validated T/S data includes Fs 73 Hz, Qts 0.36, Vas 1.4 L, Xmax 6.5 mm, sensitivity 83.6 dB, plus 21 cm³ Vd and 189 EBP. bits tracks UK, EU and US shop prices, price movement, datasheet links, simulator import data, and similar drivers, with a current best price of £25.30.
The published T/S values agree with each other
Thiele/Small
- Fs
- 73Hz
- Qts
- 0.36
- Qes
- 0.39
- Qms
- 5.4
- Vas
- 1.4L
- Re
- 3.2Ω
- Le
- 0.17mH
Motor and cone
- BL
- 4.3T·m
- Sd
- 32cm²
- Mms
- 5g
- Xmax
- 6.5mm
- Vd †
- 21cm³
Power and response
- Sensitivity †
- 83.6dB
- Manufacturer sensitivity
- 83dB
- Power
- 30W
- Impedance
- 4Ω
- EBP †
- 189 · Leans vented
Size and mounting
- Weight
- 0.9kg
Other published values
- Cms
- 0.97mm/N
† Calculated by bits from the published values
What this validation status means
Everything else Peerless lists
LF · Primary · 3.5″
- BL
- 4.3T·m
- Fs
- 73Hz
- Le
- 0.17mH
- Re
- 3.2Ω
- Sd
- 32cm²
- Cms
- 0.97mm/N
- Mms
- 5g
- Qes
- 0.39
- Qms
- 5.4
- Qts
- 0.36
- SPL
- 83.6dB
- Vas
- 1.4L
- Xmax
- 6.5mm
- Power
- 30W
- Impedance
- 4Ω
- Sensitivity
- 83dB
- Calculated sensitivity †
- 83.6dB
- Manufacturer sensitivity
- 83dB
- Weight
- 0.9kg
02
Compare
Same-size drivers, compared with the SLS-85S25CP04-04. Clear differences are green when better and red when worse.
This driverSLS-85S25CP04-04
Best price
£25.30
Fs
73 Hz
Qts
0.36
Vas
1.4 L
BL
4.3 T·m
Xmax
6.5 mm
Sensitivity
83.6 dB
Power
30 W
FaitalPRO3FE22
£18.20 · 28% less, betterFs110 Hz +51%, worse
Qts0.36 –
Vas1.3 L −9%
BL3.7 T·m −14%, worse
Xmax1.7 mm −73%, worse
Sensitivity88.4 dB +4.8, better
Dayton AudioND64-4
£20.20 · 20% less, betterFs103 Hz +41%, worse
Qts0.33 −8%
Vas0.4 L −71%, better
BL4.1 T·m −4%
Xmax1.9 mm −71%, worse
Sensitivity83.1 dB −0.5
Dayton AudioND91-4
£21.14 · 16% less, betterFs74 Hz –
Qts0.41 +14%, worse
Vas1.4 L –
BL4.6 T·m +7%
Xmax4.6 mm −29%, worse
Sensitivity83 dB −0.6
FaitalPRO4FE42
£29.42 · 16% more, worseFs110 Hz +51%, worse
Qts0.38 +6%
Vas1.8 L +26%, worse
BL5.4 T·m +26%, better
Xmax2.8 mm −56%, worse
Sensitivity89.8 dB +6.2, better
Tang BandW3-881SJF
£30.41 · 20% more, worseFs100 Hz +37%, worse
Qts0.39 +8%
Vas1.9 L +32%, worse
BL4.5 T·m +4%
Xmax0.5 mm −92%, worse
Sensitivity88.7 dB +5.1, better
Sica4 L1 1 SL
£39.28 · 55% more, worseFs120 Hz +64%, worse
Qts0.36 –
Vas1.2 L −16%, better
BL6.2 T·m +43%, better
Xmax2.5 mm −62%, worse
Sensitivity88.8 dB +5.2, better
SB AcousticsSB12PFCR25-4-COAX
£41.40 · 64% more, worseFs58 Hz −21%, better
Qts0.33 −8%
Vas4.8 L +236%, worse
BL3.8 T·m −12%, worse
Xmax5 mm −23%, worse
Sensitivity86.2 dB +2.6, better
Tang BandW3-1231SN
£46.46 · 84% more, worseFs100 Hz +37%, worse
Qts0.34 −6%
Vas1.4 L –
BL4.4 T·m –
Xmax1.3 mm −81%, worse
Sensitivity87.2 dB +3.6, better
WavecorWF118WA07
£47.60 · 88% more, worseFs56 Hz −23%, better
Qts0.36 –
Vas4.9 L +243%, worse
BL4.5 T·m +5%
Xmax4 mm −38%, worse
Sensitivity85.6 dB +2, better
SB AcousticsSB12PFC25-4-COAX
£48.11 · 90% more, worseFs58 Hz −21%, better
Qts0.33 −8%
Vas4.8 L +236%, worse
BL3.8 T·m −12%, worse
Xmax5 mm −23%, worse
Sensitivity86.2 dB +2.6, better
SB AcousticsSB12PACR25-4-COAX
£53.01 · 110% more, worseFs55 Hz −25%, better
Qts0.35 –
Vas4.3 L +201%, worse
BL4 T·m −7%
Xmax5 mm −23%, worse
Sensitivity84.8 dB +1.2
MonacorSPH-30X/8SW
£57.83 · 129% more, worseFs105 Hz +44%, worse
Qts0.42 +17%, worse
Vas1.3 L −9%
BL4.5 T·m +4%
Xmax2 mm −69%, worse
Sensitivity86.9 dB +3.3, better
MarkaudioCHR-90
£59.09 · 134% more, worseFs44 Hz −39%, better
Qts0.36 –
Vas26.1 L +1728%, worse
BL4.7 T·m +10%
Xmax7 mm +8%
Sensitivity89.4 dB +5.8, better
Tang BandW3-1335SB
£62.52 · 147% more, worseFs100 Hz +37%, worse
Qts0.34 −6%
Vas1.2 L −15%, better
BL5.2 T·m +20%, better
Xmax0.5 mm −92%, worse
Sensitivity86.3 dB +2.7, better
WavecorWF118WA01
£77.13 · 205% more, worseFs64 Hz −12%, better
Qts0.36 –
Vas4.3 L +201%, worse
BL4.6 T·m +7%
Xmax3 mm −54%, worse
Sensitivity86.8 dB +3.2, better
Scanspeak10F/8424G00
£84.48 · 234% more, worseFs90 Hz +23%, worse
Qts0.37 –
Vas2.1 L +47%, worse
BL4.8 T·m +12%, better
Xmax2.6 mm −60%, worse
Sensitivity87.8 dB +4.2, better
WavecorWF120BD11
£88.40 · 249% more, worseFs58 Hz −21%, better
Qts0.39 +8%
Vas3.8 L +166%, worse
BL4.2 T·m –
Xmax3 mm −54%, worse
Sensitivity84.7 dB +1.1
WavecorSW070WA02
£96.65 · 282% more, worseFs73 Hz –
Qts0.34 −6%
Vas0.9 L −38%, better
BL4.8 T·m +10%, better
Xmax2.5 mm −62%, worse
Sensitivity81.9 dB −1.7
MorelTIW 634ND
£206.98 · 718% more, worseFs40 Hz −45%, better
Qts0.36 –
Vas16.5 L +1054%, worse
BL6.5 T·m +52%, better
Xmax5.5 mm −15%, worse
Sensitivity86.4 dB +2.8, better
MarkaudioCHP-90 MICA
No current priceFs49 Hz −34%, better
Qts0.36 –
Vas20.1 L +1302%, worse
BL4.8 T·m +13%, better
Xmax7 mm +8%
Sensitivity89.2 dB +5.6, better
Tang BandW3-1797S
No current priceFs90 Hz +23%, worse
Qts0.35 –
Vas1.0 L −32%, better
BL4.6 T·m +6%
Xmax1 mm −85%, worse
Sensitivity84.1 dB +0.5
Tang BandW3-1750SB
No current priceFs50 Hz −32%, better
Qts0.37 –
Vas1.7 L +16%, worse
BL8.0 T·m +86%, better
Xmax5 mm −23%, worse
Sensitivity79.3 dB −4.3, worse
CIARENDI3.21
No current priceFs90 Hz +23%, worse
Qts0.38 +6%
Vas1.8 L +26%, worse
BL4 T·m −7%
Xmax2 mm −69%, worse
Sensitivity86.8 dB +3.2, better
WavecorWF120BD04
No current priceFs62 Hz −16%, better
Qts0.37 –
Vas4.3 L +197%, worse
BL4.5 T·m +5%
Xmax4 mm −38%, worse
Sensitivity86 dB +2.4, better
MonacorSPH-30X/4SW
No current priceFs105 Hz +44%, worse
Qts0.42 +17%, worse
Vas1.1 L −23%, better
BL3.9 T·m −9%
Xmax2 mm −69%, worse
Sensitivity87.2 dB +3.6, better
WavecorWF120BD12
No current priceFs57 Hz −23%, better
Qts0.38 +6%
Vas3.9 L +173%, worse
BL4.2 T·m –
Xmax3 mm −54%, worse
Sensitivity84.5 dB +0.9
CIARENDI3.25
No current priceFs77 Hz +5%
Qts0.40 +11%, worse
Vas1.7 L +19%, worse
BL4.2 T·m –
Xmax3.9 mm −40%, worse
Sensitivity84.1 dB +0.5
Tang BandW3-1318SA
No current priceFs100 Hz +37%, worse
Qts0.31 −14%, better
Vas1.2 L −14%, better
BL5.3 T·m +24%, better
Xmax0.4 mm −94%, worse
Sensitivity86.9 dB +3.3, better
Tang BandW69-1042J
No current priceFs35 Hz −52%, better
Qts0.37 –
Vas30.3 L +2015%, worse
BL13.3 T·m +209%, better
Xmax7.3 mm +12%, better
Sensitivity87.1 dB +3.5, better
Tune the match
Choose the published values that matter to your design. Size stays matched to this driver.
Qts
Qes
VasL
Xmaxmm
BLTm
- SoundImports5.0 out of 512 ratings · Checked 13 Oct 2026Read reviews on SoundImports
- Parts Express4.8 out of 54 ratings · Checked 13 Oct 2026Read reviews on Parts Express
Each shop collects its own ratings. Bits shows them as published and doesn't verify them.
| Shop | Price | Against the lowest | Stock | Link |
|---|---|---|---|---|
SoundImports Import VAT and duty may apply | £25.30, the lowest price | 421 in stock | Visit shop at SoundImports | |
Parts Express Import VAT and duty may apply | £15.87 | Back order | Visit shop at Parts Express | |
Lautsprechershop Import VAT and duty may apply | £34.55 | 37% above the lowest price | Special order | Visit shop at Lautsprechershop |
Best price over time
Tracked since 1 Apr