1" compression drivers - Emilar, Renkus-Heinz and Beyma

Is there life after Altec?

My first encounter with Emilar and Renkus-Heinz was in a discussion at the Lansing Heritage forum in 2006. Apparently, Jonas Renkus was a principal at both companies in the 70s and 80s. Prior to co-founding these companies, he worked under John Hilliard at Altec Lansing and followed him at Ling Temco Vought (LTV) where they developed a new compression driver with a polyimide suspension aluminum diaphragm. A paper on this research was submitted to the Journal of the Audio Engineering Society in 1966. This association piqued my interest, which triggered my search for affordable Emilar and Renkus-Heinz drivers.

Soon after I arrived in Manila, I became friends with artisanal speaker craftsman Lin Gomez. He is the go to person for Altec, JBL, Jensen, Western Electric or any vintage driver that needs restoration. His company used to be the official Beyma importer. During his closeout sale of Beyma inventory, among those I purchased was a pair of Beyma CP380M.

For the past couple of years, I've been playing with these drivers in the attic mounted either on the Altec 811, RCF H3709 and Altec 32C. But all of my recent critical listening was done through the mono rig driving one side of the Altec 2-way using the following crossover set up.

Crossover

3khz @ 6dB/octave high pass + HF ATT/EQ
for 16 ohm drivers

To keep things simple, critical listening tests were done with the Altec 414A full range and the above crossover was used for the Altec 802D and Beyma CP380M (both 16 ohms) cutting in @ ~ 3000 hz with a 6dB/octave slope.

3khz @ 6dB/octave high-pass + HF ATT/EQ
for 8 ohm drivers

For the 8 ohm compression drivers the above crossover was used and the 414A running full range. The 8 ohm L-pad substituted in place of a 25 or 30 ohm wire wound pot works just as well.

Splitting hairs

For all intents and purposes, these drivers were designed for similar real world applications. Since each manufacturer had their own set of measurement parameters, I deemed the inclusion of driver specifications inconsequential. Anyway, I noted that the minor differences in driver efficiency were well within the shelving range of the attenuator on both crossovers.

My main objective was simply to find out how each compression driver attached to the Altec 32C horn blends with the outstanding midrange performance of the Altec 414A woofer loaded inside the 614 bass reflex cabinet. In an ideal world, the blend should be seamless, with the horn/driver combo just filling in the missing upper frequency harmonic overtones not within the reach of the woofer.

Altec 802D
16 ohm original aluminum diaphragm
Alnico magnet

The 802D has been a musical companion for almost 20 years, so I know it very well. Attached to the 32C horn and playing duets with the 414A, they produce a harmonically rich and luscious midrange along with high frequencies that are silky smooth and extended. To my biased ears, it would be difficult to equal the 32C/802D/414A/614/JELN1600CXO quintet, short of a WE757A ;)

Emilar EC175-8
8 ohm original diaphragm
Ferrite magnet

My first impression of the EC175-8 which lingered all throughout my listening test, was a rich midrange reminiscent of the 802D. Perhaps this was due to its rather subtle presentation of high frequencies which are there, yet not stealing the limelight from the midrange. It's worth noting that this driver has a similar long throat design as the 802D. 

Renkus-Heinz SSD 1800-8
8 ohm original diaphragm
Ferrite magnet

The SSD 1800-8 + 414A was also a coherent combination. But the tonal balance was the antithesis of the EC175-8. The midrange sounded a bit leaner due to more prominent high frequencies. This driver has a short throat/pancake design like the 902-8B below. I wonder if the short throat configuration tends to enhance high frequencies?

Caveat: Based on my internet research, there are no original replacement diaphragms currently manufactured for Renkus-Heinz drivers.

Altec 902-8B
8 ohm original diaphragm
Ferrite magnet

To make things more interesting I borrowed a pair of Altec 902-8B cherished by my buddy Joel. The sound of this driver is similar to the 802D with the midrange not quite as lush but still vivid and involving. Since it had the best high frequency extension and transient response, the sound was invigorating. 

Top left: Beyma 8 AG/N 8" fullrange
Top right: Beyma SM115 15" woofer
Bottom left: Beyma CP380M
Bottom right: OB experiment ca. '09

In early 2009 I experimented with the CP380M + 32C coupled to the 15" Beyma SM115 woofer in an open baffle. I was actually quite impressed by the potential of this combination which was the reason I bought them.

Beyma CP380M
16 ohm polyester diaphragm
Ferrite magnet

However, in the context of this survey, the CP380M did not fare as well as the other drivers. Although the sound was quite pleasant with good high frequency extension, I was constantly aware of a transition between the 414A and the horn. Perhaps it was really voiced for a Beyma woofer?

Coda

The Emilar EC175-8 and Renkus-Heinz SSD 1800-8 have their virtues and omissions. If their virtues were combined, then we have a true Altec alternative. Yet despite their minor flaws, mounted on the Altec 32B horn, both easily coalesced with the Altec 414A woofer which corroborated their genetic heritage. If I didn't have the 802D, I could have easily lived with either the EC175-8 or SSD 1800-8 with a slight preference for the EC175-8 just because I'm a midrange hedonist;) 

With regards to the Altec 802D vs. Altec 902-8B, it boils down to a matter of taste as well as availability and affordability. As for the Beyma, when time permits, I will rehash the OB/SM115 + CP380M/horn experiment and post my findings;)

Happy listening!

Austin Mini Maintenance Woes

As soon as I got the brakes sorted...

...I had the exhaust leak fixed. 

In preparation for the summer heat, I installed the 

heater matrix 

to function as an auxiliary radiator.

I was about to take out the clutch master cylinder 

to clean up the rust, but it was too late.

Now I have to wait a few weeks for a replacement clutch master cylinder ;(

Listening Room - JE Labs

Hi-Fi Lounge, late 2008

I started this blog in 2011 and overlooked the fact that I haven't posted details of my systems. Visitors who remember the defunct site will be familiar with most of the components apart from a change in venue.

Stereophonic Hi-Fi

Garrrard 301 

Ortofon RMG309 + SPU GME

SME 3012 + Denon DL103S

Thorens TD124

SME 3012 + Denon DL103R

Audio Technica ATP12T + Denon DL 103

MC step-up transformers
Altec 4722 + Tamura TKS83

Sony DVP NS500V
Dyna FM3 MPX
Scott LT110B FM tuner is out of commission ;(

JEL Preamp DX 

JEL SE300B monoblocks
Tamura F7002 OPTs

JEL SE2A3dx
Tango NY15S OPTs

Radiotron SE2A3
Tango U808 OPTs

JEL Simple 45
Tamura F745 OPTs

JEL SE171A
Tango H5S OPTs

Altec 2-way
JEL/N1600C crossover

Open Baffle, Altec 755As, 755Cs and Altec 755Es are
currently in storage at an undisclosed high security facility ;)

Monophonic Hi-Fi

JEL Mono Playback

Rek O Kut B12H
Tonearms:
Right - Velvet Touch Viscous Damped
Left - Pickering 190 + GE RPX 78rpm stylus
Back - Argonne AR600 + GE VRII Triple Play

GE RPX + Denon DL102

iPod Nano doing double duty as a digital music server and FM receiver
until I find time to fix my other Dyna FM3 tuner
that served in this system for the past 7 years

Tamura line level stereo > mono mixer

+
signal processor ;)

JEL Mono preamp with variable EQ
6SL7 phono + 6F8G line stage

Mono Amps
Left--->Right
JEL SE71A 
Hammond 125ESE OPT
JEL SE10dx
Tamura F7004 OPT
JEL SE2A3dx
James 6123HS OPT

Altec 605B Duplex

Mondrian inspired OB + RCA 501S1

After almost 20 years, both systems have traveled half way across the globe with no significant changes apart from a couple of tweaks ;) 

Altec 32C horn redux

Three years ago I replaced the Altec 811 horns with Altec 32C horns in my 2-way speaker system. I think I now have an unscientific explanation as to why I've been enjoying the Altec 32C.

Upper Left: Altec 32C, Upper Right: RCF H3709
Bottom: Altec 811

Somewhere along the way I acquired a pair of RCF H3709 horns. I was rooting for these horns because they resemble the Altec 32C but with a straight throat. The RCF H3709 to a much lesser degree, still exhibited some congestion and harshness I found objectionable in the Altec 811 in near field listening. Perhaps a judicious amount of damping applied to the thin walls of the RCF H3709 will significantly improve its performance. 

Top: Altec 811
Middle: RCF H3709
Bottom: Altec 32B/C

Based on the throat comparison picture above, I attribute the sonic superiority of the Altec 32C in my listening environment to its unconstricted and constant flare throat. But that's just my empirical observation ;)

Additional Information

Here's a quote from a post by Steve Schell at the Altec Lansing Forum

"...the initial throat portion of the H811b appears to have been designed to narrow the directivity of the high frequencies to partially equalize the on axis response. This is not a great solution for the falling power response of a compression driver, as the on axis response and reverberant field will vary greatly in high frequency content, which our brains interpret as unnatural. I would be tempted to model a horn similar to the 811 where the major flare portion maintains itself back to the driver aperture. The horizontal axis should (as designed) maintain the driver's power response to the limits of the straight horn walls, the driver's falling power response being EQed in the crossover, resulting in a more natural listening result. Just a thought, anyway."

Joe Roberts had nice things to say about the Altec 32A/B/C at the High Efficiency Speaker Asylum and Audiokarma.

Canon P DIY/CLA

After developing my negatives from our Tokyo trip, I noticed a thin band of overexposure on a few frames I shot over 1/125, as seen in the two pictures above. Eventually, I also lost speeds below 1/60. These were indications that the curtain drum and rollers where dirty, dry or both.

So I downloaded and studied the service manual. This manual is just a reverse engineering illustration of how the camera was built. There are no instructions on how to service the camera.

Even if I've had previous experience restoring a Leica II and a few Feds and Zorkis, I ruled out dismantling the shutter mechanism on this more complex camera. I didn't even consider adjusting the shutter tension. My main objective was to gain access to the curtain drum and rollers which were blocked by light baffles so I could flush them with Naptha and then re-lubricate. After this procedure, 1/125-1/1000  looked much better on the CRT screen shutter test. I loaded a test roll.

Test shots after DIY/CLA

@ 1/1000

@ 1/500

@ 1/250

@ 1/15

@ 1/500

@ 1/1000

DIY Audio and Music in Tokyo

My fascination with Japanese culture was sparked by my passion for DIY Audio. As my hobbies expanded to photography and restoring an Austin Mini, I realized that my pursuits run parallel with many Japanese aficionados. As soon as we landed in Tokyo, I searched for bookstores to browse the latest magazine issues related to these interests.

I've written about my collection of Japanese audio magazines and books which I used to order from Kinokuniya Books in NYC. 

I found the Kinokuniya main store in Shinjuku. But my enthusiasm was dampened when I found the selection of vintage and tube related audio magazines was rather sparse. However, I soon discovered that the audio department of... 

...BIC Camera

and...

...Yodobashi Camera stock the latest, as well as more recent issues, of Stereo Sound Tube Kingdom, MJ and other Tube DIY-related publications.

Magazines and books are not light, so I had to choose carefully to comply with baggage allowance limits ;)

Akihabara

A trip to Tokyo for an audio DIY enthusiast is not complete without an Akihabara pilgrimage ;)

Furnished with valuable tips from audio buddies familiar with the area, first stop was Tokyo Radio Department Store.

I headed down to the basement and was greeted by this sight.

But I quickly turned left when I noticed this sign in real life. After more than twenty years of trying to decipher Noguchi Transformer Ads in MJ, I found myself at their store.

It was sad not to see traces of Tango/ISO which ceased operations in mid-2013. There were some Hashimoto and Tamura transformers but not the complete line. 

 I came here mainly for their house brand Noguchi Power Max iron, of which they had plenty in stock. The owner seems to comprehend but didn't speak much English. I knew what SE OPTs I was looking for and that kinda broke the ice. Still, I couldn't engage him in a conversation to get an idea on the local state of DIY/Tube audio.

SE 10 amp with Noguchi Power Max iron + more amps

Diatone PM610 reissue, Fostex, JBL, etc.

SE friendly Lowther +...

...Altec 604-8G(?) in an Onken box

I forgot to take a picture, but at the opposite end of the basement is a chassis store that can CNC project cases and enclosures to customer requirements.

Let's go up two and three flights...

TIP: prices are a bit cheaper as you go higher in the building, cheaper rent perhaps? ;)

Parts galore

The custom here is, get yourself a tray and pick all the parts you need.

Then the shopkeeper will tally up your purchase. Neat!

Vacuum Tubes

To someone used to tube pricing from 10 years ago at US Hamfests and Radio Shows, prices here were a bit steep ;)

One Stop Shop
Just about anything one needs to build a tube preamp or amplifier can be acquired at Tokyo Radio Department Store.

Japanese culture is very reserved. They are a very quiet people who minimize talking and maximize working - an ethic I truly admire. As long as you know what you need you'll enjoy shopping in spite of the language barrier.

The Shopping Bag

All within baggage allowance limit - just about ;0

Here's a pair of Noguchi PMF10WS and PMF15WS - roughly the equivalent of the entry-level Tango U808 and Hashimoto HC-203U + a pocket Sanwa DVM. I also got some Alps Blue Velvet 250K and other carbon track pots of different values + miscellaneous parts hard to source in Manila.

Across the street and right under the tracks of the Chuo-dori line is Akihabara Radio Center.

This place is even closer to the JR train station in Akihabara. It has lots of test equipment, electronic parts, tubes, etc. Pricing is similar to Tokyo Radio Department Store but more old school in atmosphere. I saw a stall that had transformers marked Toei which I've seen in vintage Japanese OEM tube equipment sold in the USA in the 50s and 60s. The second floor is a flea market of sorts where items are stored inside glass display cases, each leased by a different vendor. Buyers call on shopkeepers to look at items. I saw vintage speakers, audio equipment, well-made DIY amp projects and even vintage timepieces and cameras. Unfortunately, taking pictures in this building was not encouraged :(

A couple of blocks down and around the corner from Akihabara Radio Center is Kouizumi-Musen or Kouizumi Radio.

Kouizumi-Musen

This store is well stocked with brand new raw drivers, horn and compression drivers, tweeters, crossover components from Fostex and other Japanese makers. They also carry Jensen reissues and Altec drivers, replacement cones and diaphragms from Great Plains Audio.

Speaker kits and cabinets

Tube amp kits and newly manufactured tubes, presumably from China

I was hoping to find a bonsai Altec Voice of the Theater kit which I used to see in MJ and Stereo Sound Ads ;(


LPs in Ochanomizu

Disk Union is a large chain store selling new and used LPs, CDs and other audio software.

They even had a shelf filled with old issues of Japanese audio and jazz magazines.

I picked up a few mono Jazz LPs, mostly Japanese pressings for $2-$4/each.

Due to time constraints, I didn't get a chance to see shops filled with Western Electric, Altec, JBL gear. But while strolling the mid century modern furniture shops in Meguro-dori, I saw this Garrard 401 with an SME 3009 + an interesting tonearm I've never encountered before. I also missed the experience of a Live Jazz bar or a Jazz Kissaten. Definitely next time!


Concerts

The main highlight of our visit to Tokyo were two concerts.

An evening of chamber music at the National Arts Center Tokyo.

Four very fine young and accomplished Japanese musicians along with Maestro Heiichiro Ohyama, violist and music director/conductor of Santa Barbara Chamber Orchestra, treated the audience to an exquisite performance of Beethoven's String Quartet No. 4 in C minor, Op.18 and String Quintet in C major, Op. 29.

Suntory Hall

Itzhak Perlman and Rohan de Silva gave a remarkable recital at Suntory Hall which was the conclusion of their Asian Tour to celebrate Perlman's 70th year.

At the Suntory Hall lobby with friends after Perlman's concert

The day after, I had a great time catching up and reminiscing about our student days at Juilliard with Rohan over dinner ;) 

Finally, this trip would not have been as memorable if my ever supportive muse wasn't by my side ;)

!!!Happy Holidays!!!