HiVi M8a 8" Aluminum/Magnesium Woofer

HiVi M8a 8" Aluminum/Magnesium Woofer

Brand:| Model: M8a
Overview
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.
Highlights
  • 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
Part # 
297-447
Weight: 6.31 lbs.  
IN STOCK
List Price$85.99
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Part # 297-447
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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
    (10 Reviews)
  • Weight6.31 lbs.
  • California Prop 65

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

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Reviews

HiVi M8a 8" Aluminum/Magnesium Woofer
HiVi M8a 8" Aluminum/Magnesium Woofer is rated 4.3 out of 5 by 10.
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
Rated 5 out of 5 by from Swan Diva 6.1 DIY SpeakerHaving just completed a copy of the Diva 6.1, I can honestly say they used the perfect driver for their speaker. I question why they went with a paper woofer on the 6.2, due to the outstanding bass provided by the M8A. The two drivers on each speaker produce amazing tight deep bass, as good as any comparable speaker under $2000.
Date published: 2010-07-27

Product Q&A

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HiVi M8a 8" Aluminum/Magnesium Woofer

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

M8A vs. M8N ? Same performance / specs ?

What are the differences between the HIVI M8A & M8N other than the frame ? Similar performance ? The recommended HIVI vented box volume is almost half what your woofer selection guide suggests. Can I use 1 of these drivers in a 2 cu ft. vented enclosure in a 3 way system ? I don't have a sub and am using them in a 15 x 25 ft. room. Are they too small for a full sounding system in that size room ? I have the option of using a lower quality 12 instead, but like HIVI products.
Asked by: Airmover
I believe these HiVi drivers are so similar that you could use either one. I do believe these could be enough to replace a subwoofer (for music of course) when used with the following cabinet.Make a ported cabinet of 1.75 cubic feet (internally). The port diameter should be 2.5" and the length should be 8.5" (I've one below that will be fine). The cabinet tuning frequency is 28 Hz, and the F3 is 30 Hz.
Answered by: mikevv
Date published: 2011-02-28

Is this speaker shielded...?

Just checking to see if this speaker is shielded and if it isafe around electronics. If it is not shielded is there a practical way to shield a speaker?
Asked by: dvdmaximum
This woofer is not shielded. There really isn't a practical way for an end user to shield speakers.Many speaker manufacturers are moving away from shielded speakers due to CRT TVs (older tube type) being replaced by plasma and LCD TVs that do not require an adjacent speaker to be shielded.
Answered by: mikevv
Date published: 2011-02-28

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