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HiVi M8a 8" Aluminum/Magnesium Woofer

Brand:|Model: M8a|Part # 297-447
The HiVi M8a provides excellent quality bass definition with good extension (40 Hz), and can be used to great effect in a medium sized 2-way speaker system or as a woofer in a 3-way system.
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Part # 297-447
  • Extremely rigid Aluminum/Magnesium cone
  • Specially made high-loss rubber surround
  • High power handling Kapton voice coil former
  • Air transparent spider
  • High density aluminum die-cast basket
  • Symmetric Motor Drive (SMD) technology

Product Details

HiVi M8a 8" Aluminum/Magnesium Woofer

HiVi's M8a woofer has been designed to deliver outstanding bass reproduction in vented systems. The M8a utilizes a unique one-piece aluminum/magnesium composite cone. The cone's superior rigidity contributes to dynamic and accurate reproduction of transient program material. A high-temperature voice coil former, air transparent spider, and venting of the coil maximize power handling. The M8a provides excellent quality bass definition with good extension (40 Hz), and can be used to great effect in a medium sized 2-way speaker system or as a woofer in a 3-way system. Recommended crossover frequency region for a 2-way system design is 1-2 kHz.

Product Specifications
  • Nominal Diameter8"
  • Power Handling (RMS)80 Watts
  • Power Handling (max)160 Watts
  • Impedance8 ohms
  • Frequency Response30 to 3,000 Hz
  • Sensitivity88 dB 2.83V/1m
  • Voice Coil Diameter1.38"
Thiele-Small Parameters
  • Resonant Frequency (Fs)33 Hz
  • DC Resistance (Re)6.5 ohms
  • Mechanical Q (Qms)4.59
  • Electromagnetic Q (Qes)0.49
  • Total Q (Qts)0.44
  • Compliance Equivalent Volume (Vas)1.49 ft.³
  • Mechanical Compliance of Suspension (Cms)0.61 mm/N
  • BL Product (BL)10.5 Tm
  • Diaphragm Mass Inc. Airload (Mms)38.1g
  • Maximum Linear Excursion (Xmax)5.8 mm
  • Surface Area of Cone (Sd)214 cm²
Materials of Construction
  • Cone MaterialAluminum / Magnesium
  • Voice Coil FormerKapton® / Polyimide
  • Basket / Frame MaterialCast Aluminum
  • Magnet MaterialFerrite
Mounting Information
  • Overall Outside Diameter8.47"
  • Baffle Cutout Diameter7.36"
  • Depth3.54"
  • # Mounting Holes6
Optimum Cabinet Size (determined using BassBox 6 Pro High Fidelity suggestion)
  • Sealed Volume0.56 ft.³
  • Sealed F360 Hz
  • Vented Volume1.74 ft.³
  • Vented F332 Hz
HiVi M8a 8" Aluminum/Magnesium Woofer
  • BrandHiVi
  • ModelM8a
  • Part Number297-447
  • UPC844632021831
  • Product CategoryWoofers
  • Unit of MeasureEA
  • Product Rating
    (11 Reviews)
  • Weight6.31 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 HiVi M8a 8" Aluminum/Magnesium Woofer
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HiVi M8a 8" Aluminum/Magnesium Woofer
HiVi M8a 8" Aluminum/Magnesium Woofer is rated 4.3636 out of 5 by 11.
Rated 5 out of 5 by from Excellent woofer in 3/4 Way ApplicationWhen you first get this woofer out of the box, you will notice just how amazing the build quality is on this woofer. Very attractive cone, the inverted dome look is extremely attractive. The cast frame is extremely sturdy, and the motor assembly is beautiful.I Bought 8 of these for 2 sets of 4 way towers, they are not completed yet; however i have done extensive testing with the woofer itself. Out side of an enclosure if you are doing tone generation then you will notice distortion as you approach the xmax threshold. That being said if you have any music going on with it, it becomes very hard to pick out. I had to play some very bass heavy EDM to really notice the distortion. If you are playing at anything near a reasonable listening level, you will never have a problem with excursion.While testing these drivers i have discovered that they are all pretty similar in parameters, and from 1000 below sound great. The bass in these are very nice, and accurate. Above 1000, just as the response graph would suggest, cone break up starts to occur and you loose your clarity.If you doing anything that is 3 way or more, I would highly recommend these woofers, they will definitely make you happy. For a 2 way you would probably want to go with the Dayton rs-225 or something smaller. I personally think that this is a better deal than the rs-225 for 3 ways, but it would not do well in a 2 way.
Date published: 2015-05-21
Rated 5 out of 5 by from Great look, even better soun!Very surprising bass! Built 1.3 cu. ft. vented box, installed HiVi M8a 8" woofer, HiVi M5a midranges, and Dayton Audio planar tweeters. Amazing sound!
Date published: 2014-02-09
Rated 1 out of 5 by from Nice Looking Woofer that doesn't meet its specsI bought two of these to build a vented system. I measured the Qt at .611. This is a long long way from .43. So far off that the speaker is really unusable for vented systems. The impedance curves shows something nasty going on at about 2400 Hz. No biggie if you are doing a three way system but a problem for 2-way systems. I took an Xacto knife to the woofer's spider too see if I could lower the Q. Got it down to .5 with a lower Fs, of course the Vas goes thru the roof and you need a giant box. Too bad, very cool looking drivers.
Date published: 2012-10-24
Rated 5 out of 5 by from Great MidrangeI know it's a woofer, but the thought of using a metal cone (Aluminum / Magnesium alloy) as a midrange seemed interesting. As a matter of fact, HiVi recommends using some of their similar smaller metal cone woofers as midranges. My thought was that metal cones should make plucked strings/piano/drums sounds sharper. I guess I was right cause it sounds great. Sorry I can't comment on how it plays as a woofer, but it's a great midrange, especially playing jazz. By the way, it gives great voice projection as well.
Date published: 2012-04-06
Rated 5 out of 5 by from Finishing upI using this 8 in woofer for my home theater in my bed room along with HIVI model B3N 3 inch full range speaker. Haveing a TEAC 400 watts 5.1 Home Theater Receiver system I needed to burn off the power so these 15 watt units wouldn't blow. I used 4 20 watt 8 ohm non-inductive resistors in each cube eating up 80 watts.Happy to say this system I built rocks. The system will punch out the full sound of a Wurlitzer Theater Organ. Just what I was looking for.I had a ball building the cabinets. The cubesare 5W X 6H X 3D open faced (no children) saveing from making covers. The gold color caps just finish it off.The 8 inch HIVI is in a old Sony subwoofer cabinet power wattage unknow. Will finish up soon with a new cabinet and power amp.
Date published: 2011-10-27
Rated 5 out of 5 by from great wooferUsed a pair of these for some in-walls in a 2-way, due to their low Fs for an 8" woofer and reasonable Qts. They handle music power superbly in the IB setup and provide over 100dB without distortion or bottoming out in a 15'x40' room. A 2nd-order LPF @ 800Hz and a series notch @ ~2khz flattens response nicely and allowed the Dayton RS28a tweet to cross in at about 1200Hz.Smooth and articulate sounding woofer, for sure. Suspension and cone look about identical to the M8N, the only exception being that the frame on this thing is massive. The mounting flange on this thing is probably a good 1/4" or thicker of solid metal.
Date published: 2011-01-03
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Product Q&A

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HiVi M8a 8" Aluminum/Magnesium Woofer

How this woofer work in 1.4 cubic feet vented cabinet with a three ways design (Midwoofer and tweeter in separate cabinet), the crossover 500 / 2,500 Hz. What is the port dimension?

Asked by: vic23
I would recommend a 2.5" diameter, 8.5" long port for this which will tune to 30 Hz. A good option for this is below.
Answered by: MattP
Date published: 2015-10-26

what tweeter and crossover setup should i use with this speaker for my cabinet speakers?

Asked by: charchar18
You may want to search the forums, as this can be trick to use in a two way setup. I have them in a .65ft^3 sealed box with a Dayton "silky" tweeter. Crossed @ 1600/6db. I had to use some heavy EQ to get them to sound what I considered good. I am now building a vented cabinet with a three way design including a Tang Band W4-1320sif mid range and a Dayton 500/4000hz crossover.For info on a 2-way read this: this helps,Jazz
Answered by: JazzC
Date published: 2015-03-31

I am planning to cross this over at 1800hz in a 2-way system, implementing a zobel network.  Is the Le you mentioned in the previous comment (1.35mH @1khz) still what I should use?  I'm new to crossover design and I'm trying to understand it all.  

Asked by: piggiesonwheels
Using the Le from 1kHz will work fine for this design.
Answered by: MattP
Date published: 2015-03-16

Is the Le value known for this driver?  I am interested in trying it as an upgrade to some Dayton classic 8s I have in a 3 way vented 1.5 cu ft box crossed at 300hz.  I would like to implement a zobel.

Asked by: Dan S 4444
The Le on this driver at 1kHz is 1.35 mH.
Answered by: MattP
Date published: 2015-01-19

Very small sealed cabinet?

How would this woofer fare in a very small sealed cabinet (.25 cubic ft)? I plan to do a 5.1 speaker setup, building all the speakers into the wall so I no longer have towers infront, shelves for the rear, and a large cube sitting in the corner all taking up space. I would like to use a pair of these 8" woofers as my subs, but having them built into the wall seriously limits the size of the cabinet.I'm not an "audiophile", and the speakers this would be replacing is a decent Sony setup with a 12" 180 watt sub that sounds just fine to me, and I've never even really pushed it. So I'm not trying to rattle any windows or anything with them. I would just like them to fairly accurately reproduce low notes and make me feel some shaking when the Death Star blows up and such.As a final thought, the reason this woofer is tops on my list as a sub is because of how visually attractive it is. I would be using either the 4" or 5" version as my mids all around, so having a matching "sub" would make for an attractive setup even when not using it. But I just don't want to spend all this money and time building enclosures inside my walls, to end up with a beautiful looking system that has a low end of 60hz.Anyone have any thoughts on this?
Asked by: oTTo the CzAR
Hi,That size box and type will not produce low end to your liking. The F3 is 74Hz in that size closed box. Even the optimum sealed enclosure isn't going to produce Subwoofer deep bass. This is a woofer designed for 2 or 3-way speaker systems, not subwoofer duty.So, I'd strongly suggest you look for something else for your application. To be honest, you're going to be hard pressed to find anything that is going to produce the type of low end you are desiring in that size enclosure in a typical living room.A lot of car audio subwoofers are designed for smaller enclosures, but even then, sealed designs that small are going to generally require small drivers. Also, they have the cabin gain of the typical car to make up for their lack of output or low end extension in those small boxes. The living room doesn't have the same advantageous transfer function.You might want to think about an infinite baffle setup and look for subwoofers designed for that application instead.Hope this helps.
Answered by: Dr. Zhivago
Date published: 2014-03-09

Recommendations for two woofers in a 2.6 ft3 enclosure

Looking to use either these or the Hi-Vi F8's in tower speaker with dual woofer configuration. Exsisting enclosure has just under 2.6 Ft3. Not sure if this is too large of volume when compaired to the Vas. of driver. Also looking to use P.E. Dayton 2Khz. 2-way X-over part# 260-140. ave not yet made a decision on Tweeters to be used...Any recommendations would be helpful.
Asked by: Bonewah
Using a pair of the HiVi M8a 8" Aluminum/Magnesium Woofers in a tower with 2.6 cu. ft. may be a little less than optimum for these speakers, however you could compensate by adding a tuned port.The mid upper frequency is at 3khz. Any mid - tweeter that has the sound characteristics you desire should work well. These woofers will be tight and not real deep however their transient responce will be very dynamic and pure.Good Luck
Answered by: Nitnub
Date published: 2011-09-10
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