Anyone measured T/S values for HiVi M6a?

[Paul Carmody]

HiVi's measurements are usually pretty good, but I'm curious if anyone has measured these drivers themselves to see how they compare.

[mrp]

Heres what I've got before any break-in:

Re 6.551
Fs 54.51
Qts .4943
Qes .5402
Qms 5.814
Le .4497
Mms 22.38
Vas .3033

I use Specified SPL method of 86 dB and diameter of 5".

[Paul Carmody]

Oooh! This models much better than the HiVi specs, like slammin' good!

I am assuming you mean .3033 cubic feet for the Vas? This translates to 8.6 liters. That's significantly different than the HiVi spec of 21.9 liters.

[HareBrained]

Oooh! This models much better than the HiVi specs, like slammin' good!

I am assuming you mean .3033 cubic feet for the Vas? This translates to 8.6 liters. That's significantly different than the HiVi spec of 21.9 liters.

Yeah. In Unibox, these measurements allow for a lower F3 (~37Hz) in 15L than in the PE quoted specs at 20L. I wonder if we'd see the same with the M5's?

[Paul Carmody]

Yeah. In Unibox, these measurements allow for a lower F3 (~37Hz) in 15L than in the PE quoted specs at 20L. I wonder if we'd see the same with the M5's?

Well, the M5a I'll let you know about soon. I've got a few coming in the mail (getting ready to design an HT setup for a friend of mine). I skipped on the M6a because the published T/S specs made it seem basically impractical (needed a large enclosure to get a reasonable F3, breakup peak close to passband).
However, if the published Vas is off, that changes everything. I'll gladly toil with a nasty breakup if I can get some beefy extension from a driver. (hence, my experiment with the Classix).
Now I'm thinking I might want to order a few M6a to measure for myself; maybe they're worth trying after all.

[HareBrained]

Well, the M5a I'll let you know about soon. I've got a few coming in the mail (getting ready to design an HT setup for a friend of mine). I skipped on the M6a because the published T/S specs made it seem basically impractical (needed a large enclosure to get a reasonable F3, breakup peak close to passband).
However, if the published Vas is off, that changes everything. I'll gladly toil with a nasty breakup if I can get some beefy extension from a driver. (hence, my experiment with the Classix).
Now I'm thinking I might want to order a few M6a to measure for myself; maybe they're worth trying after all.

Well, please keep us posted. I'm considering using a set of Mark Audio CHR-70 and the M5* in a FW for computer speakers.

What is the difference between the M*a and the M*N? Are they worth the difference in cost?

[Wolf]

Well, please keep us posted. I'm considering using a set of Mark Audio CHR-70 and the M5* in a FW for computer speakers.

What is the difference between the M*a and the M*N? Are they worth the difference in cost?

The A is cast-frame/unshielded.
That is about it really!
Wolf

[Wolf]

Well, please keep us posted. I'm considering using a set of Mark Audio CHR-70 and the M5* in a FW for computer speakers.

What is the difference between the M*a and the M*N? Are they worth the difference in cost?

I really like the M series of drivers. The midrange is just incredible, and the bass is taut/accurate. Once you kill the resonances they are a great value, and aken to a "Poor-man's Excel", as I have heard a lot. I actually like these speakers better in sound than the "Canvas". My "Mn-14" will not be leaving my ownership anytime soon!



Thought of another difference- sizes.
There used to be an M8N, there is no "A" smaller than 5", and there is no "N" larger than 6" now.

Why aren't there any larger B series drivers than a 4"??

Just rambling,
Wolf

[HareBrained]

The A is cast-frame/unshielded.
That is about it really!
Wolf

I really like the M series of drivers. The midrange is just incredible, and the bass is taut/accurate. Once you kill the resonances they are a great value, and aken to a "Poor-man's Excel", as I have heard a lot. I actually like these speakers better in sound than the "Canvas". My "Mn-14" will not be leaving my ownership anytime soon!

Thought of another difference- sizes.
There used to be an M8N, there is no "A" smaller than 5", and there is no "N" larger than 6" now.

Why aren't there any larger B series drivers than a 4"??

Just rambling,
Wolf

Why do I hear banjo music?

Thanks for the facts. And this is also good feedback. Did you happen to measure the T/S parameters for your M5N's? How close were they to the PE/HiVi advertised specs?

BTW, PE still lists the M8N but they're awaiting new stock... the loved ones are always the last to know.

Edit: I compared the specs of the M5a and M5N drivers list by PE to those listed by M***sound. They are significantly different numerically but modeled, there was only a Hz or two difference in the same volumes. Nothing like the M6a data posted above compared to the PE posted data. M***sound didn't have any T/S specs posted for this driver.

[Wolf]

Why do I hear banjo music?

Thanks for the facts. And this is also good feedback. Did you happen to measure the T/S parameters for your M5N's? How close were they to the PE/HiVi advertised specs?

BTW, PE still lists the M8N but they're awaiting new stock... the loved ones are always the last to know.

Edit: I compared the specs of the M5a and M5N drivers list by PE to those listed by M***sound. They are significantly different numerically but modeled, there was only a Hz or two difference in the same volumes. Nothing like the M6a data posted above compared to the PE posted data. M***sound didn't have any T/S specs posted for this driver.

The T/S for all but the M8N is in the Mad-catalog I have, so I don't know why it's not online. Yes- I did measure T/S as I always do for the M5N, but I did not even compare them to the PE specs. I can go into Unibox to retrieve them if you are interested.

I actually prefer the midrange of the M series to the B series. Something about those "golden-tan" concave woofer sones too......
Later,
Wolf

[HareBrained]

The T/S for all but the M8N is in the Mad-catalog I have, so I don't know why it's not online. Yes- I did measure T/S as I always do for the M5N, but I did not even compare them to the PE specs. I can go into Unibox to retrieve them if you are interested.

I actually prefer the midrange of the M series to the B series. Something about those "golden-tan" concave woofer sones too......
Later,
Wolf

It would be great if you could post them. Paul will be posting has M5a measurements when they arrive, and the question came up because of the differences in MRP's measurements from those posted at PE, which resulted in a completely different box. I realize that if I do use the M5, I will probably have to measure (WT3 at least), but it'd be nice to have the additional samples.

[Wolf]

It would be great if you could post them. Paul will be posting has M5a measurements when they arrive, and the question came up because of the differences in MRP's measurements from those posted at PE, which resulted in a completely different box. I realize that if I do use the M5, I will probably have to measure (WT3 at least), but it'd be nice to have the additional samples.

Hi-Vi M5N SPL at 1 W 1 m 85.9 dB
Fs 49.76 Hz SPL at 2.83 Vrms 1m 86.1 dB
Re 6.88 Ohm Max SPL at 10 W 95.9 dB
Qms 6.96 Qts 0.446
Qes 0.48 Effective Qts 0.494
Sd 91.5 cm2 Mms 11.13 g
Vas 10.8 l Cms 0.919 mm/N
Xmax peak 2.50 mm Rms 0.500 kg/s
Le 0.50 mH Bl 7.09 Tm
Le2 0.00 mH Ref. efficiency, n0 0.269 %
Re2 0.00 Ohm Efficiency, n 0.241 %
Nominal Power 10.0 W Applied voltage 8.29 Vrms
Piston range 1017 Hz
External Components Down fire application 0.96
Rs 0.80 Ohm Suggested box type Vented

I think I might've guesstimated the Sd, but other than that, it's what I used.
There you go!
Wolf

[Kapton Planet]

Heres what I've got before any break-in:

Re 6.551
Fs 54.51
Qts .4943
Qes .5402
Qms 5.814
Le .4497
Mms 22.38
Vas .3033

I use Specified SPL method of 86 dB and diameter of 5".

I wouldn't put much faith in that Vas "measurement". The SPL chosen could have been incorrect (spec is 88dB, which would make a difference) and the driver was not broken in. Doesn't Vas go up after break-in?

[Paul Carmody]

This is my measurements of the M5A... seems pretty close to Wolf's measurement of the M5N

Fs 51.80 Hz
Re 6.90 Ohm
Qms 6.74
Qes 0.50
Qts 0.463
Sd 87.0 cm2
Vas 10.9 l
Xmax peak 2.70 mm
(Le) 0.80 mH
SPL at 1 W 1 m 86.4 dB
SPL at 2.83 Vrms 1m 86.8 dB
Max SPL at 1 W 86.4 dB
Mms 9.25 g
Cms 1.021 mm/N
Rms 0.447 kg/s
Bl 6.46 Tm