Another Electro Voice Interface D/Sentry VI thread.

[absolve2525]

That's awesome, Hunter! I have been rotating between CD players lol. I can definitely notice the bass weight and clarity differences between them. The articulation of the Interface D bass makes it possible to hear subtle differences. I couldn't find any serial numbers on the backs when I tilted them forward. Is it a sticker? I saw some remnants of something paper like on the back of one.

 

[hunter00]

yes both numbers are on a sticker on both speakers.Was just wondering where our speakers in relation to one another as there both series one.
Yes I cant get over the bits and pieces of music im picking up with these fishers that weren't appearent before with even the dynaco mono block amps.Im finished lookin for amps now....

 

[futureman]

I am really enjoying this thread, fellas. I have the interface C II speakers, and I have been looking almost daily for the D's. They are a dream speaker for me!


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[hunter00]

I am really enjoying this thread, fellas. I have the interface C II speakers, and I have been looking almost daily for the D's. They are a dream speaker for me!


Sent from my iPhone using Tapatalk

Yes I don't think those that own them sell,there the kind of speaker that can end your search especially if you need horns and efficiency.Thats why there so great for the tube crowd
hunter

 

[PeterSchut]

Listening tests

Hi Forum,

Last week I took the Interface D set home. I rewired the speakers to be connected direct to the filter. I replaced the fixed VMR wire with a decent one (I used 2.5mm2/AWG12 litze for all speaker units) and all speaker connection went outside the box with the filters behind the enclosure (see pics).

I used biamping with 4 of the 7 amplifiers from my 58kg/128lbs power amp. The amp is 150W@8 ohm and 250W@4 Ohm and every amp has its own 600VA power transformer.
The Interface EQ between pre and power amp. I experimented with having the eq only between the LF section and the mid/HF section direct. Source is a Sonos connect playing FLAC files feeding my own designed Symmetrical DAC (using the fantastic HDCD filter and 4x Burr-Brown PCM1704).

mmmm ... what a great speaker. It does all things so well it is amazing. For a 1978 designed speaker and components I can only conclude that technology has not improved dramatically in the design of speakers and units.
The main virtue that stands out is dynamics and man can this set go loud. all other speakers i ever heard before sound compressed. If the CD has good dynamics it is better then ever before. LF impact is amazing especially with the eq in place. I had the idea that the EQ only in the LF path sounded a bit cleaner but the differences are tiny. Either will work fine.
If you can get a "D" go for it (there is one on ebay now at a steep 3k US$)

So ... I have finished the design of the smaller interface surround speakers with ST350/VMR and a 10"woofer, next is the center channel where I have difficulties getting a VME/ST350 and a 10 woofer in the space that is given for that speaker (see Audio Physic Avanti center in the picture)

Cheers

 

[PeterSchut]

Today's status

Hi Guys,

I have found a suitable 10" woofer for the surround speakers. It is the Eminence Deltalite II 2510. It is the only unit I could find from any brand that works well in a 60 liter enclosure, is loud enough (97db 2.83V/1m) and has the right TS parameters to get a decent frequency response.

I used the Interface 300 enclosure to perform a test with this driver (with 70 liter and tuned around 40Hz) it was close enough to perform a test with the pro VMR, an ST350b and the Interface D filter. The new enclosure will be 60 liter tuned at 50Hz.
The filter (without the 2.5ohm in series with the woofer) works great. I only need to change a value in the VMRpro to ST350b x-over. I lowered the 1.3mH (in series with the VMR) to 0.8mH and I had a perfect flat response. The original filter had quite a hole in the 1-4k region that I didn't understand. Possibly the 9µF needs to become 4.7 to 6.8µF. Also the larger distance between VMR and tweeter influences the measurement quite abit depending on microphone position.
This hole is not visible in the interface Delta measurements with the different Delta VMR and ST350a.

The Eminence 10 inch will be slightly less ideal for the 27 liter Interface Center enclosure but just OK. An EV Force 10 would do perfect here, but they are hard to get, or just too expensive (US, transport, VAT)

Attached the set as it stands now, the Interface Epsylon front speaker, The interface Zeta surround speaker and the Interface Center.
Also two pictures of the Interface 300 with Eminence woofer, VMR pro, ST350b and closed hole where the original tweeter was.

Cheers,
Peter

 

[Glossy]

Sentry 500 high frequency housing

Hi PeterSchut,

I would like to make the timber horn housing for the sentry 500 high frequency driver I have. I am not sure how the design allows room to accommodate the sponge that sits over the dome.

Is it possible you can provide images on how this was done on your unit please?
...or if you are thinking of maybe selling the housing, please let me know.

Ow, one last question, as you have heaps of experience working with timber, does it look difficult or easy to build such a housing?

Thank you heaps, cheers

 

[PeterSchut]

Hi Glossy,
I have sold the Sentry 500. What i remeber is that there is a metal plate on top of the tweeter assembly and just a piece of cloth as a ring that sits between the wood horn and this assembly.
I don't think this is easy as the horn has a precise shape were you need a CNC machine to cut the wood.
If you send me an email address via pm, I will send you all pictures I have.
Cheers,
Peter



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[PeterSchut]

Update (at last)

Hi Forum,
Even though it has been quiet with updates, the project is still very much alive. The old Interface delta's are now in use as my previous speaker set is now completely sold.

I had to find a new woodworker for the CNC work as my nephew had too much work. This is now in progress and this week the first parts will be coming out of the CNC machine.

The speakers did change a bit from a construction point of view. First pre veneered MDF ebony, later pre veneered thick veneer (2mm) maple. The final choice is now that the enclosures are built from 22mm MDF and that they will be veneered afterwards with a nice hand selected curly maple in book-matched figures.

I also bought 176kg of bitumen self adhesive plates of 4mm thick weighting 8kg per square meter. I plan to put two layers of this on most panels adding 20 to 30kg per speaker.

The filters for the center and surround are prepared where the final tweaks will be made when the speakers are finished.

This set will be used for music but also movies. I use a fairly old but good sounding surround processor that can only handle the older bitstream signals, none of the more modern signals that only exist on HDMI. A recent test has shown that I missed quite a bit. So the sale of the old speaker set allows to built the new speakers and i have some money left for a new surround receiver. I am going for the recently announced Atmos receivers where I want to add 4 height channels. so a 5.1.4 setup. Using up-firing speakers that will be powered from the new surround receiver. The main channels will be powered from my original 7 channel 58kg monster.

Attached the set as it is being built (except the veneer grain) and a picture of the 3 extra filters in the make for the surround and the center speaker.

More to follow in the next months when the set is being finalized.

 

[totem]

Superb work!

 

[PeterSchut]

Things are moving

The enclosures are in production.
Pictures say more than words, see attached.

We decided at the end that it would be easier to veneer the enclosures later.
I hand picked a nice set of book-matched curly maple veneer...... can't wait.

 

[PeterSchut]

Some more pics

And some more pics,

The enclosures are being damped bu two layers of 8 kg/m2 bitumen adding about 20kg of mass to the bigger front speakers.

Also some pictures of the Center speaker with the recessed 10"woofer where the ST350a gets a coaxial spot in front of that unit.

I have removed two horns of the ST350B's that will be used in the surround speakers (the were scratched). They are sanded with a beam of aluminum oxide and will be spray painted later. Also you can see that this unit is nicely reassessed.

Cheers,
Peter

 

[PeterSchut]

We are getting there

Hi Forum,

Another update. The veneer is on the is placed on the enclosures, a nice book matched pattern on the larger panels with the grain running from left to top to right.

They should be done next Sunday and then I can mount the units.

The plan has increased during my stay on the beach in Spain. I decided to go Full Monty. and add 2 side surround speakers containing only a VMR and an ST350b. and add 4 ceiling speakers containing a s small 5" mid/woofer and a T35b.

This will end up as an Dolby Atmos enabled 7.1.4 set (google if you are interested)
A Dolby Atmos enabled receiver will be available as of next month.

For the rest, just look at the pictures ..... I hope you like them.
Cheers
Peter

 

[PeterSchut]

Almost there .....

Hi Guys,

Attached some more pictures of the progress.
The last bit cost me again a full day (just mounting the front panels)

Man these things are getting heavy.

The next thing is mounting the speakers and filters of the front channels.
Need to do some work on the filter of the center and surround.
I also started to match the 7 VMR's with 7 ST350b's (that is beside the front speakers units as they originated from the original Interface D)

Cheers

 

[Coytee]

Looking very nice!

 

[PeterSchut]

Testing 1...2...3....

Yeah, the front speakers are running.
They sound awesome with much better bass definition and control.
The mid and height didn't change that much as expected, although a slignt improvement is there. cleaner and the sound stage is more spacious. (maybe the elevated mid and high are responsible for that).

But the difference in low end definition is stunning. The enclosure is much more death and damped and that was not the strongest point of the original Interface D enclosure. I could advise owners of the original D to add some bracing and lead bitumen to stiffen the bigger panels.

Well .... see attached pictures for the end result.

Next the center and surrounds......

 

[totem]

Great job, can't say it gets any better than what you have been able to put together!

 

[PeterSchut]

Great job, can't say it gets any better than what you have been able to put together!

Thanks, it has been a big project with many setbacks (the idea started last Christmas) but going the extra mile is rewarding.

 

[Benz67]

Does anyone know where I can get a recone kit for the 12in. woofer in my interface D ? Looked all over the place and can only find the foam surround kits. All the cone kits I found for EV all have the pleated surrounds not the foam like the origional, and I'm not sure they would even fit my driver.

 

[PeterSchut]

Does anyone know where I can get a recone kit for the 12in. woofer in my interface D ? Looked all over the place and can only find the foam surround kits. All the cone kits I found for EV all have the pleated surrounds not the foam like the origional, and I'm not sure they would even fit my driver.

That will be a challenge. Are the defect?
Be careful as you have a newer woofer than mine. With a fully different set of TS parameters.
The 0090 (your version) does not need the 2.5 ohm series resistor and could do without the EQ at a slightly less LF response but also a lower efficiency.

Cheers,