Dynavox 5 incher

[dst]

I thinking about a slim 2.5 way tower with two 5 inch drivers. I know Wolf made a nice 2-way (Vijon) with the Dynavox and it was heard at one of the DIY events. What did folks think of the Dynavox? Is the bass OK, as a Seas, Vifa SB Acoustics or Dayton Ref certainly has better xmax and lower FS.

[MSaturn]

Certainly from a value perspective, the Dynavox is going to lose big to all of those. The RS150 is a steal for the performance. The SB Acoustics 5.5" is reputed to performly poorly in the bass department; SEAS drivers are pretty much always well-built.

[Wolf]

Certainly from a value perspective, the Dynavox is going to lose big to all of those. The RS150 is a steal for the performance. The SB Acoustics 5.5" is reputed to performly poorly in the bass department; SEAS drivers are pretty much always well-built.

MS-
If you vent the Dynavox 5.25" in 15 ltrs, you get an F3 of 32 Hz. I've heard it personally. Can the others do that?

DST- would you like me to work up a Xover for the 2.5-way using the RT1.3 as I did? That should be simple enough to do....

Let me know,
Wolf

[MSaturn]

Bah, a single 5.25" driver simply isn't physically capable of a real 32Hz tone, or at least a respectable one, and two of them are still only about the radiating area of an 8" driver.

[Wolf]

Bah, a single 5.25" driver simply isn't physically capable of a real 32Hz tone, or at least a respectable one.

You need to hear it for yourself...
Wolf

[MSaturn]

You're hearing harmonics.

[Wolf]

You're hearing harmonics.

Why do you think I'm hearing harmonics? Unibox does not lie. The F3 is 32 Hz.



Now- you tell me that ain't 32.51 Hz!

Xmax is good to that point too!



Later,
Wolf

[MSaturn]

Xmax is only good to like 38Hz, and that's at a measly 15 watts. Use a bigger driver ;p

[Wolf]

Xmax is only good to like 38Hz, and that's at a measly 15 watts. Use a bigger driver ;p

But that is at 95dB! If you want your ears to bleed- by all means use a bigger driver.

And remember- that is a logarithmic scale... It is closer to 32 Hz than that.

Later,
Wolf

[dst]

Wolf:

Wow. Yes, a 2.5 xover would be very much appreciated if it is easy for you, but please don't go out of your way.

In the Dynavox reviews on PE I also saw a reviewer list how he was getting some great bass from the 5 incher in a tower with bottom port.

Intersting.

You grooving on the Dynavox mid range as well?

Now, I as thinking of a narrow 6 inch wide baffle for a true thin floorstander, as my home theatre room is long but narrow, and my spouse thinks a narrow speaker is better.

Many thanks.

[dst]

Wolf:

So in a 2.5 way would you think it best to put each driver in its own 15 litre compartment and vent both? Or do a 30 liter with one vent? In regard to two vents and compartments, that is how Vienna Acoutstics does it on their Mozart speaker, which by the way I really like for a thin baffle 2.5 way. The Mozart is kind of my design aim in terms of overall dimensions. In regard to sound, I also think it is one of my favorite commercial speakers in that price range.

[dst]

Wolf:

Not to bug you, what are your thoughts on the Hi-Vi tweeter? As my first thoughts on the 2.5 way were the BG Neo3pdr, but I bet they are somewhat similar.

Again, many thanks.

[dst]

As to the above post regarding the Dayton Ref drivers, yes I realize they are amazing in their value and salute PE for producing such a great value. but I tend to prefer paper and poly cones over aluminum (including the Seas alum and mags), and my current monitors are a Seas poly design and a great, great speaker (Seas P17REX, no longer made but a dandy!), so I was thinking of something different, and have looked at the Dynavox for a long time with a good degree of curiosity,and Wolf's recent Vijon experience further piqued my interest.

[dst]

As to Wolf's 32 hz claim, here is one from the PE review of the Dynavox 5 incher. Most interesting and verifies Wolf's measurements.

-----

Good woofer, but must match with high-end tweeter
Friday, August 1, 2008
Danny V. from Bark River, MI.


Many moons ago, my friend and I built a two-way floorstander for his "party room". I am a professional designer with a custom loudspeaker hobby business, so I hope that you trust my calculations. We built a 20.53 liter cabinet that measured internally at 6"w.X 6.5"d.X 32 1/8"h. We used a 1.5" dia.X 3.5" port tube for an F3 of 33 Hz. We put 2"high runners on either side of the bottom of the cabinet to lift the speaker off of the floor and ported the speaker at the bottom (similar to older Polk Audio power-port designs). We then experimented with crossover points and decided on a fourth-order filter at 1,800 Hz with a third-order low pass. Although the low x-max of 3 mm. won't allow for high SPL's , The sound was so awesome that we began to laugh when we listened to them...(He calls me "the mad scientist"). I won't tell you about the tweeter that we used,but I would use a high-quality Morel or Scan Speak driver. Seriously people, I have built MANY loudspeakers and, if you experiment a little, you can get these babies to sing! Very neutral sound but are only effective to 2,000 Hz max. Better than most 5" Morels at a cheaper price. If you are into experimenting and can afford the cost, please try our design! You won't be discouraged!!! In this design, maximum RMS is 100 watts of high-current power into 8 ohms. Hope you have as much fun as we did!!!

[Wolf]

Wolf:

Wow. Yes, a 2.5 xover would be very much appreciated if it is easy for you, but please don't go out of your way.

You grooving on the Dynavox mid range as well?

Now, I as thinking of a narrow 6 inch wide baffle for a true thin floorstander, as my home theatre room is long but narrow, and my spouse thinks a narrow speaker is better.

It would be really easy for me, as I have all of the files. It wouldn't take much but converting the files to a 2.5-way setup. The 6" baffle would not be a good choice though, as it's actually a 5.75" driver across the frame. I would say use a solid 3/4" roundover, and use a 7.25" baffle. The midrange is very nice from the LW5 midbass.

So in a 2.5 way would you think it best to put each driver in its own 15 litre compartment and vent both? Or do a 30 liter with one vent? .

I would personally use a whole-volume of 30 ltrs and one port, as it's easier, and you can still brace without sealing off chambers. Not a big issue. Be sure to double the port cross-sectional area though, and keep the same length.

Not to bug you, what are your thoughts on the Hi-Vi tweeter? As my first thoughts on the 2.5 way were the BG Neo3pdr, but I bet they are somewhat similar..

The RT1.3 I believe to have a better transparency than the BG, and I was told several times at Iowa '09 that it was a tossup in some attendee's eyes/ears for the Cryolites and my Vijon, purely for the top-end. I like the HiVi better, and it's cheaper!

As to the above post regarding the Dayton Ref drivers, yes I realize they are amazing in their value and salute PE for producing such a great value. but I tend to prefer paper and poly cones over aluminum (including the Seas alum and mags), and my current monitors are a Seas poly design and a great, great speaker (Seas P17REX, no longer made but a dandy!), so I was thinking of something different, and have looked at the Dynavox for a long time with a good degree of curiosity,and Wolf's recent Vijon experience further piqued my interest.

As to Wolf's 32 hz claim, here is one from the PE review of the Dynavox 5 incher. Most interesting and verifies Wolf's measurements.

While I disagree with the reviewer about the Dyn's top-end, I have heard the 15 ltr vented alignment with great grins across my face. I used the LW5 to 3kHz, and it does this very well.

Now to specifics, would you use the 'onset baffle'? Mine are 8" wide on the main-box, and they don't look big. I cannot say for certain that the response and dispersion will be the same without doing this as I did. However, I don't feel it would suffer very badly if not. And a heads-up, these will probably run you about $500 for drivers and xover parts for the TMM as a rough guess.

Let me know what you want about a few of these things...
Later,
Wolf

[MSaturn]

If other types of these drivers are any indication, the reviewer is probably correct about the top end ..

[shawn_a]

You need to hear it for yourself...
Wolf

Don't you just love it when someone who hasn't actually worked with a driver before can just know everything about it? It simply boggles the mind.

shawn

[Wolf]

If other types of these drivers are any indication, the reviewer is probably correct about the top end ..

Nope, he's not.
I've used it, and I should know.
Wolf

[Wolf]

Don't you just love it when someone who hasn't actually worked with a driver before can just know everything about it? It simply boggles the mind.

shawn

Oh, yes. Absolutely! It's a shame he hasn't used it to have any sort of solid opinion or experience with it.
Cornfuzzled,
Wolf

[MSaturn]

I think you like novelty more than quality drivers.