agedhorse

Again, just a design choice/preference.

Ashdown DIDN’T get the volume so wrong. It was simply a design choice. By any chance was that tweeter ADDED to the cabinet in the existing port???

Ok, I just ran the numbers and I think you may have gone down a rabbit hole. If the internal dimensions of the box are really 41 liters, a 3" diameter port 2" deep is going to be fine at 100 watts RMS. If you go to a 4" diameter port, the depth will increase to 4" and you will increase the power handling to a little over 150 watts RMS (a better choice).

Bill's right here. What's necessary is to make the best choices so that the compromise can be lived with. Looking back at your first post, are you SURE that your port velocity is being calculated correctly. for a 75mm diameter port, I would not expect that much velocity from a single 10" driver. I'm starting to think that there is an error somewhere... since you are using WinISD, that's the first place I would look. Buggy software is a charitable way of saying it.

The port area is too small, increase the diameter by ~2cm and see if the length remains reasonable. With that driver in that size box, you may not be able to achieve an acceptable tuning.

It's ok for power cords IF a heavier gauge is necessary and the strain reliefs are appropriate. Speaker cords are generally a heavier gauge because the voltage is lower and the current is higher for the same amount of power transmitted.

Correct, it’s unrelated to the power amp (power tubes/valves, transformers, etc.) Proper troubleshooting will narrow down the area responsible for the noise, then it can be appropriately repaired.

Neutrik specifically warns OEM manufacturers of cables against using tinned wires with their SpeakOn plugs for the reasons I mentioned earlier. Assembly with tinned wires also invalidates the safety approvals of the plug since the plug’s safety certification is for untinned wire termination only.

As far as the sound differences in "premium priced cables" and solid commercial/pro/tour grade cables is generally indistinguishable to those participating in double-blind testing. I have seen these tests many times, and seen folks claim things that proved unconfirmable. The exception to the rule is high impedance sources into high impedance loads (instrument cable), when the cable gets long there can be a significant difference between cables due to the capacitive reactance of the cable and how that reactance interacts with the reactance of a passive pickup. You can experience reduced high end, you can experience resonance effects, and you can experience additional noise. The longer the cable, the more noticeable. This has been my experience (over and over again).

Tinning wires with binding screw pressure terminations are a problem because the solder will cold flow under pressure. It's not allowed in avionics here in the states. The regulatory approvals for most pressure screw connectors will specify un-tinned wire only. There may be some exceptions for tin overbond wire in some applications, but only because pure tin does not cold flow as easily.

This is why soldered connections on plugs should always have a mechanical strain relief. Even mechanically attached plugs like SpeakOn have robust strain reliefs built into the connector.

Not for Neutruik SpeakOn plugs. Under high current, the pressure of the termination (without tinned wired) is better than solder and will not loosen with use either.

This is generally fine. Spraying into the amp usually gets incompatible substances where they don't belong, creating new and messier problems to deal with.

Good God I hope not, for the sake of the tech that needs to clean up the resulting mess at least.

Sure hope they don't go spraying things down with "magic cure-all spray", I see plenty of gear damaged from such treatment. ESPECIALLY switch contact cleaners.

Why does your amp need servicing?

The foot switch is no longer available? Didn't it get introduced just last year?

Ok, that's a GB 410 standard, had to go back deep into the archives but it was a model from the mid to late 1990's and was shipped 8 ohm as standard with a 4 ohm optional version as well. I do still have a limited number of recone kits available for this model in both 8 ohms (standard cabinet, series-parallel wiring) and 4 ohms (optional cabinet, 16 ohm driver parallel wiring).

Can’t open the pictures

Can you post a picture?

Yes, this is correct.

IME, most 300 watt RMS speaker that will handle this kind of power may be quite colored due to the heavier suspension and long wound voice coil (compared with gap depth) required for mechanical robustness. This results in significant high frequency rolloff compared with a full range or extended range design.

Some but certainly not all manufacturers provide these specifications. Depending on the circuit topology, the input impedance may be different or the same between passive and active inputs. On the Subway amps, the input impedance is ~1M in both passive and active positions. The specifications for the Subway amps are located in the back of the respective owner’s manuals.

Yeah, I did kind of get that switched around