free shipping at parts express

Tang Band W4-1720 4" Underhung Midbass Driver

Brand:|Model: W4-1720|Part # 264-872
The W4-1720 4" midbass features a long throw, underhung 1-1/4" voice coil driven by a massive ferrite magnet structure.
In Stock
List Price$68.99
You Save26%
Your Price
Buy 4+$48.64
Part # 264-872

Product Details

Tang Band W4-1720 4" Underhung Midbass Driver

A shorting ring on the polepiece is responsible for the speaker's extremely low levels of second and third order harmonic distortion. This impressive motor is coupled to an optimized paper cone with rubber surround, supported by a cast aluminum frame.

Product Specifications
  • Nominal Diameter4"
  • Power Handling (RMS)30 Watts
  • Power Handling (max)60 Watts
  • Impedance4 ohms
  • Frequency Response60 to 8,000 Hz
  • Sensitivity86 dB 1W/1m
  • Voice Coil Diameter1.25"
Thiele-Small Parameters
  • Resonant Frequency (Fs)60 Hz
  • DC Resistance (Re)3.8 ohms
  • Voice Coil Inductance (Le)0.04 mH
  • Mechanical Q (Qms)2.33
  • Electromagnetic Q (Qes)0.51
  • Total Q (Qts)0.42
  • Compliance Equivalent Volume (Vas)0.21 ft.³
  • Mechanical Compliance of Suspension (Cms)0.13 mm/N
  • BL Product (BL)3.82 Tm
  • Diaphragm Mass Inc. Airload (Mms)5g
  • Maximum Linear Excursion (Xmax)5 mm
  • Surface Area of Cone (Sd)57 cm²
Materials of Construction
  • Cone MaterialPaper
  • Surround MaterialRubber
  • Basket / Frame MaterialCast Aluminum
  • Magnet MaterialFerrite
Mounting Information
  • Overall Outside Diameter4.95"
  • Baffle Cutout Diameter3.75"
  • Depth3.25"
  • # Mounting Holes4
Optimum Cabinet Size (determined using BassBox 6 Pro High Fidelity suggestion)
  • Sealed Volume0.08 ft.³
  • Sealed F3114 Hz
  • Vented Volume0.19 ft.³
  • Vented F360 Hz
Tang Band W4-1720 4" Underhung Midbass Driver
  • BrandTang Band
  • ModelW4-1720
  • Part Number264-872
  • UPC844632069604
  • Product CategoryWoofers
  • Unit of MeasureEA
  • Product Rating
    (16 Reviews)
  • Weight4.1 lbs.
  • California Prop 65

    Warning: California residents only. Please note per Proposition 65 that this product may contain chemicals known to the State of California to cause cancer and birth defects or other reproductive harm.

View similar products to the Tang Band W4-1720 4" Underhung Midbass Driver
in the Woofers product category.


Tang Band W4-1720 4" Underhung Midbass Driver
Tang Band W4-1720 4" Underhung Midbass Driver is rated 4.875 out of 5 by 16.
Rated 5 out of 5 by from Fantastic!I bought these about a year ago for a MTMW design to be used as the mids. As I was building the cabinet I built just a tiny little box for 2 of them (paying no mind to dimension or volume) to play music and break them in. The second I turned them on I was blown away! They have horsepower for days, great bass extension, and even without a tweeter I didn't mind the sound.I don't know how I'll do another project without these.
Date published: 2015-01-08
Rated 5 out of 5 by from amazing 4 inch speakerHave had for about a month. Building into a BOOM box with 6.5L per speaker (ported). Really good upper bass, excellent mod range. lower bass is strong and surprisingly detailed. In a boom box, more tan adequate bass. very heavy. Someone compared these to scan speak quality. I would agree very close at a fraction of the cost.Very impressed!
Date published: 2014-05-21
Rated 5 out of 5 by from Incredible sound!Paired this with a Dayton silk dome tweeter. Crossed at 2,500 Hz. Sound was unbelievable...I pushed it too hard and blew it. Already ordered the replacement. These are awesome drivers!
Date published: 2014-03-31
Rated 5 out of 5 by from Does what no other driver canIn ~0.25 cubic foot tuned to 55Hz, this driver gets down into the 40's! Not only does it get there, but it sounds very good up to the 2500Hz crossover point I selected. After modeling a slew of small drivers based on their T/S parameters, I'm confident that there is not a better driver for (almost) full range near field monitors in such small cabinets. Yes, they have their limitations but I'm sure there are many people like me that want a nice sounding desktop system while in the office for near-field listening. They handle enough power to get too loud for me to listen to at a seating location 2.5 feet away. While the driver could easily cross higher, I chose 2.5kHz since the listening position is close and I wanted to reduce error. I did try a 2nd order crossover and didn't like it as much as LR4 but the XT25 tweeter I'm using doesn't have the best performance down low. I personally feel like a dedicated subwoofer would be detrimental for music listening unless you regularly listen to pipe organs, use these in a big room or just want to play loud. Having used many >$200/piece mid-bass drivers, this little 4" driver for around $50 did more than surprise me. The midrange performance is top notch.
Date published: 2013-08-19
Rated 5 out of 5 by from Great driver, clean, fullVery clean mids and a surprising amount of low end extension. Super beefy motor and overall very well made. Check the voice coil leads as they may be close enough to the spider that they could slap at full extension, but just move them a bit and you're fine. At the sale price, I don't think there's a 4" driver that can touch it in performance.
Date published: 2012-03-19
Rated 5 out of 5 by from Drop-in replacement driver for 5" Bazooka tubesI used these to replace blown drivers in some old 5" Bazooka vented tubes (discontinued long ago). They were literally a drop-in replacement with the mounting holes even lining up. No modification required to the driver or enclosure.They're probably too low Q for the enclosure, but this driver gave those old tubes a new life, and I was able to enjoy bass in my car again.
Date published: 2012-03-03
  • 2016-02-10T06:45CST
  • bvseo_cps, prod_bvrr, vn_cps_3.1.6
  • cp_1, bvpage1
  • co_hasreviews, tv_0, tr_16
  • loc_en_US, sid_264-872, PRD, sort_mostRecent
  • clientName_PartsExpressInternational

Product Q&A

Get your questions answered from other customers
who own this product or have experience with it.
If your question requires design or troubleshooting information,
please email  for a prompt reply.
Tang Band W4-1720 4" Underhung Midbass Driver

Cabinet volume (internal) and vented port diameter (straight) with length? Planning to use two W4-1720's (series for 8 ohms), one W6-1139SIF, and one 25-1719S in each cabinet along with the 260-156 crossover.

Asked by: RealWoodAudio LLC
I would recommend a volume of 0.45 cubic feet for both with a 2-1/2" diameter, 8-1/2" long port for a tuning frequency of 56 Hz.
Answered by: MattP
Date published: 2015-03-16

Which speaker is best - maybe this is it?  Application car audio subs.  Severe limitations - must go  in manufacturer bass box .21cft vented 3" allowing for 2 speakers with outside diameter not greater than 5". Running MTX R251D amp. Suggestions? HELP!

Asked by: Pretender
Please contact our tech support for more help with this question, or 800-338-0531 x1.
Answered by: MattP
Date published: 2014-10-07

The spec sheet shows a range up to 8kHz but the on-axis response on the datasheet shows output beyond 10kHz.  Is on axis output inconsistent?  Or is TB just being conservative because of normal off axis response due to 4" directivity patterns?

Asked by: dp399
Tang Band is simply stating the useable frequency response before "trouble" occurs. I would personally not use this or any similar sized driver much beyond about 4,500 Hz do to beaming.
Answered by: MattP
Date published: 2014-09-03

1 Is a sealed or vented box preferred? 2. what is the optimum size.3 recommended crossover? 4. vented or sealed subwoofer? 5. Size of box?

Asked by: bernieD
Please contact our tech support for more help with this question, or 800-338-0531 x1.
Answered by: MattP
Date published: 2014-08-12

I am planning a 5.1 surround sound system using 3 Tang W4 speakers in MTM configuration with a Planer PT2C ribbon tweeter. The rear speakers will use only one Tang. The subwoofer I have is an AURA 18" unit I bought from you several years ago.

Asked by: bernieD
Please contact our tech support for more help with this question, or 800-338-0531 x1.
Answered by: MattP
Date published: 2014-08-12

I plan to use these units in an MTM configuration with a Dayton electrostatic tweeter. Would you recommend a sealed or vented cabinet What would be the optimum size? What is the recommended crossover.

Asked by: bernieD
Cabinet volume would need to be 0.55 cubic feet for both with a 2" diameter, 6-1/2" long port for a tuning frequency of 48 Hz. A crossover cannot be recommended without knowing which tweeter you plan on using. Please email or call us with any further questions about the design.
Answered by: MattP
Date published: 2014-07-01
  • 2016-02-10T07:31CST
  • bvseo_cps, prod_bvqa, vn_cps_3.1.6
  • cp_1, bvpage1
  • co_hasquestionsanswers, tq_12
  • loc_en_US, sid_264-872, PRD, sort_recentQuestionsFirst
  • clientName_PartsExpressInternational

Recently Viewed Products

Parts Express FacebookParts Express TwitterParts Express YouTubeParts Express PinterestParts Express SpotifyParts Express Instagram
Live Chat Software