Proson Twin 716 Spinorama measurements (CTA-2034)

[DanielT]

These are some of their brands:

JWS
Proson
Genexxa
Sonab
System One
Dynavoice

You mean the fake Sonab's sold in the 1990s?

It was unclear who owned the Sonab and even Carlsson brand name. That's because Stig Carlsson never submitted a formal trademark/brand name
registration for his brand.

In any case, the "fake" Sonab had nothing to do with Stig Carlsson's speakers. He was not involved in any way with this "fakes". See page two, in the thread below, where Peter Steindel, who knows how it was with that thing, explains:

faktiskt.io • Visa tråd - Äkta Sonab och falska Sonab som såldes på 90-talet?

Genuine Sonab and fake Sonab sold in 90s?

For those who wonder who this Stig Carlsson was, here is some information:

carlsson story

 

[Multicore]

Here is my take on the EQ.
Please report your findings, positive or negative!

For the score rational your journey starts here
Explanation for the sub score

The following EQs are “anechoic” EQs to get the speaker right before room integration.
If you able to implement these EQs you must add EQ at LF for room integration, that is usually not optional… see hints there.

The raw data with corrected ER and PIR:

Score no EQ: 2.5
With Sub: 4.6

Spinorama with no EQ:

• Huge dip in the 1-4kHz region
• Resonances
• Poor directivity

View attachment 412481

EQ design:

I have generated two EQs. The APO config files are attached.

• The first one, labelled, LW is targeted at making the LW flat
• The second, labelled Score, starts with the first one and adds the score as an optimization variable.
• The EQs are designed in the context of regular stereo use i.e. domestic environment, no warranty is provided for a near field use in a studio environment although the LW might be better suited for this purpose.

Score EQ LW: 4.6
with sub: 6.6

Score EQ Score: 5.3
with sub: 7.4

Proson Twin 716  APO EQ LW 96000Hz
December092024-124406

Preamp: -8.00 dB

Filter 1: ON HPQ Fc 50.9 Hz Gain 0.00 dB Q 2.11
Filter 2: ON PK Fc 77.8 Hz Gain -6.45 dB Q 1.77
Filter 3: ON PK Fc 876.9 Hz Gain -1.90 dB Q 4.20
Filter 4: ON PK Fc 1267.4 Hz Gain 2.31 dB Q 6.89
Filter 5: ON PK Fc 1626.5 Hz Gain -0.95 dB Q 0.66
Filter 6: ON PK Fc 2621.1 Hz Gain 8.66 dB Q 1.38
Filter 7: ON PK Fc 8296.1 Hz Gain -2.20 dB Q 6.01


Proson Twin 716  APO EQ Score 96000Hz
December092024-124407

Preamp: -7.90 dB

Filter 1: ON HPQ Fc 50.9 Hz Gain 0.00 dB Q 2.11
Filter 2: ON PK Fc 78.0 Hz Gain -6.45 dB Q 1.77
Filter 3: ON PK Fc 864.9 Hz Gain -1.90 dB Q 6.87
Filter 4: ON PK Fc 1282.2 Hz Gain 4.92 dB Q 5.84
Filter 5: ON PK Fc 1631.6 Hz Gain -2.77 dB Q 1.42
Filter 6: ON PK Fc 2741.8 Hz Gain 8.66 dB Q 1.52
Filter 7: ON PK Fc 8156.9 Hz Gain -2.20 dB Q 5.26

View attachment 412486

Spinorama EQ LW
View attachment 412482

Spinorama EQ Score
View attachment 412483

Zoom PIR-LW-ON
View attachment 412484

Regression - Tonal
View attachment 412485

Radar no EQ vs EQ score
Some improvements
View attachment 412487

Just how automated is the production of posts like these?

 

[Ageve]

You mean the fake Sonab's sold in the 1990s?

It was unclear who owned the Sonab and even Carlsson brand name. That's because Stig Carlsson never submitted a formal trademark/brand name
registration for his brand.

In any case, the "fake" Sonab had nothing to do with Stig Carlsson's speakers. He was not involved in any way with this "fakes

Yeah, I know.

I was going to mention QLN as well. That’s another brand they ruined, but QLN have since recovered, and I don’t think they want to be associated with the Proson-level of quality they had back then.

 

[Spkrdctr]

For the American audience these are the type of speakers sold in big parking lots out of a white van. Absolute junk masquerading as speakers!

 

[beefkabob]

Swedish people have oddly-shaped ears. This is a well-known fact. To them, these speakers are excellent. They also make excellent boats that don't sink on their maiden voyages.

 

[DanielT]

For the American audience these are the type of speakers sold in big parking lots out of a white van. Absolute junk masquerading as speakers!

I found this video interesting. Mainly, starting at 7:18, How to identify (ridiculous, comical) then the next part in the video starting at 9:10, Is it still happening:

 

[Thomas_A]

I remember those brands but never heard any of them. Cheap and poor, I felt no need listening to any of these.

 

[DanielT]

I remember those brands but never heard any of them. Cheap and poor, I felt no need listening to any of these.

If we're talking about white van speakers, there were apparently a hell of a lot of brands and models. Must have been a lucrative scam otherwise why so many? :

...:

white van speaker list that can be updated.

I don't know if there is something like this here but we could post brands we heard or know are whitevan brands. Acoustic Response Series 707 Acoustic Image 3311 / 3312 Acoustic Lab Technology Acoustic Monitor Acoustic 3312 Studio Monitor Acoustic Response Advanced Sound...

audiokarma.org

 

[VVR]

It seems to me that the tweeter is in reverse polarity.

 

[Ageve]

Here's a teardown:

The cabinet is made of 15 mm MDF (~0.6 inches).

This is the only bracing:

A bass port made of paper is mandatory in a Proson speaker.

Lower part of the cabinet:

A cable stapled to the side panel:

It seems to me that the tweeter is in reverse polarity.

Nope. I tried reversing the polarity. See first post.

 

[EXIF68]

Here's a teardown:

The cabinet is made of 15 mm MDF (~0.6 inches).

View attachment 412611


This is the only bracing:

A bass port made of paper is mandatory in a Proson speaker.

View attachment 412612


Lower part of the cabinet:

View attachment 412613


A cable stapled to the side panel:

View attachment 412614


View attachment 412617


View attachment 412618


View attachment 412619


View attachment 412621




Nope. I tried reversing the polarity. See first post.

Forget this Speaker. This is lowest Qualität I have seen in the last time,

 

[Ageve]

Forget this Speaker. This is lowest Qualität I have seen in the last time,

Yep. Hard to forget when you live in Sweden though. These are just a few of the speakers they have released over the years:

(It's really just scratching the surface)

 

[Thomas_A]

The interior opening of the port seems to be very close to the cabinet wall.

 

[Ageve]

The interior opening of the port seems to be very close to the cabinet wall.

Yep, 4 cm:

 

[Juhazi]

Excuse me, but measurement was at 1m distance but mic height was not mentioned. If the mic was at tweeter height as I presume, the axial and horizontal off-axis esponse dip comes from directivity. So it would not be such a problem if measured farther away . We can presume that a floorstander is at least 2m away, most likely 2,5-3m from the listener. This is why evaluation measurement distance should be 2 or 3m (spl corrected to 1m)

 

[Thomas_A]

Yep, 4 cm:

View attachment 412639

Do you know the diameter of the port? A rule of thumb is that the distance should be minimum the diameter of the port.

 

[Thomas_A]

Excuse me, but measurement was at 1m distance but mic height was not mentioned. If the mic was at tweeter height as I presume, the axial and horizontal off-axis esponse dip comes from directivity. So it would not be such a problem if measured farther away . We can presume that a floorstander is at least 2m away, most likely 2,5-3m from the listener. This is why evaluation measurement distance should be 2 or 3m (spl corrected to 1m)

Yes, large speakers need larger measurement distance, generally.

 

[Mnyb]

Yep. Hard to forget when you live in Sweden though. These are just a few of the speakers they have released over the years:

(It's really just scratching the surface)

View attachment 412632

Could these guys also be behind the absolutely terrible Bricklin speakers?

Example

Bricklin 350 högtalare

Utropspris: 1499 kr. Typ: Auktion. Slutar: 2025-01-09 11:01:56. Köp & sälj begagnade & oanvända Stereohögtalare på Tradera.

www.tradera.com

 

[Ageve]

Do you know the diameter of the port? A rule of thumb is that the distance should be minimum the diameter of the port.

6.5 cm.

Could these guys also be behind the absolutely terrible Bricklin speakers?

Example

Bricklin 350 högtalare

Utropspris: 1499 kr. Typ: Auktion. Slutar: 2025-01-09 11:01:56. Köp & sälj begagnade & oanvända Stereohögtalare på Tradera.

www.tradera.com

Yes, they were made by JWS.

 

[Ageve]

Excuse me, but measurement was at 1m distance but mic height was not mentioned. If the mic was at tweeter height as I presume, the axial and horizontal off-axis esponse dip comes from directivity. So it would not be such a problem if measured farther away . We can presume that a floorstander is at least 2m away, most likely 2,5-3m from the listener. This is why evaluation measurement distance should be 2 or 3m (spl corrected to 1m)

Thanks, I know. I usually don't measure floorstanding speakers for that reason. I did a number of measurements at 1m and 2m before the spin (in my living room). That's when I found out that it's not a 2.5-way design (very bad vertical directivity). I had to use a 3ms window because of the 2m distance. That's why the resolution is low in the images below.

As you can see, the on-axis dip wasn't as deep in my living room. I think I was a couple of centimeters off (below tweeter axis) and that's enough to change the response with this speaker. The response at the lower woofer level got worse at 2m for some reason (I re-measured it to make sure, and the mic height was the same for all measurements. I just moved the speaker up and down).