Chienmortbb

Just had a delivery from Thomann, new bass plus all the XLR and SpeakOn connectors. Decision time. Do I do a rough up of the back panel using the existing back panel so I can start on the wiring or wait for the delivery from Quick Panel?

I looked into converting the PA at Poole Town Football Club to run on 12V during an emergency. The solution I found to be best was a a leisure/Deep cycle battery powering a 12v DC to 36v DC boost converter powering a class D amp that runs on a single supply rail. Like many of these things, the boost converter and amplifier module comes from China. Amplifiers based on iCs such as TDA7498(E) and TI's TPAxxxx range work well at this voltage. Remember that there will be loss through the converter (perhaps 20%) and te amplifier will be 90% or so efficient. Also even leisure/deep cycle batteries can never be used until fully discharged.

Yes that would make it easier to get panels made at HiFi2000/Modushop and I might try them for the front panel.

Yes I bought my case about 6 months ago from Modushop. The panel shown above has been orderd from Quickpanel. I have not yet had an ETA but don't expect a really fast turnaround as they re-anodise the panel after machining. Of course the power amp modules are still in China so there is no rush. The cost for that panel including shipping is just over £36. To use anyone else that I have found would have cost over £60. Hifi2000/Modushop now offer a similar service and may be faster however the advantage of Quickpanel and a few others is that they have the software.

The case was originally intended for a new bass amp but that is on hold. The good thing about it is that the sides are chunky aluminium extrusions. As you can see from the picture this maes a nice 230 X 80 mm heatsink. Ideally the fins would be vertical but you can't have everything. AS the font and back panel are also aluminium (3mm thick) this is a fair amount of passive heatsinking for class D amps. I have a nice 80mm fan that I can install if needed. The weight is 1.9Kg, not lightweight but solid. Incidently I have not designed the front panel yet. The rear panel was designed in Quickpanel (www.quickpanel.sk) and has been ordered. I know from experience that DIY panel look homemade so I bit the bullet.

I chose powered amps as it means that the failure of one amp/power supply will not affect the other amp. The main use would be of a single channel feeding both the subs and the top PA speakers. There would also be line outputs for the second channel. This would be the line outputs for a second channel of subs and tops, just by adding another two channel amp. While thinking about the project it became clear that with simple switching the amp could be used as a standard two channel amp or a single channel (bridged amp) outputting well over 1000 watts. Here is a mock up of the rear panel:

It is a steep learning curve for me. One thing I should mention is it is not a low cost option. I would have bought a ready rolled unit if I could.

As I mentioned I wanted to use parts I had as much as possible and I already had the enclosure, https://modushop.biz/site/index.php?route=product/product&path=25_290&product_id=429 I also have the 3e Audio DSP module based on Analog Devices ADAU1701 chip. This is a basic DSP with 2 analogue inputs and four analogue outputs making it ideal for use as an active stereo crossover. http://www.3e-audio.com/dsp/adau1701-2in4out/

I started a thread in the Amps and Cabs forum discussing the shortage of amps. I wanted a new power amp for my PA as I sold my heavy amps and it was as I was looking that I found there was a shortage of amps. Here is the other thread: So I decided I had enough modules and other parts around to build one myself. I had a number of power amp modules plus an enclosure and a DSP module that I wanted to use. I wanted a reasonably high power amp that was versatile, powerful and reasonably easy to repair. However I soon realised that the mish mash of modules I had would not fit the "easy to repair" requirement. I soon narrowed it down to two modules, both powered. These were the ICEPower 125ASX2 and a Connex IRS500SMPS. The Icepower unit can reach close to 500 watts into 4 ohms and the Connex can exceed 500 watts into 4 ohms. I decided on the Connex as the basis of my two channel power amp. I have had each of these units for some time and although sonically and in terms of power, there really is little to chose between them, the ICEPower unit seems to be affected by the worldwide shortage of components whereas the Connex was qouted as 10 days to shipment. In addition the Connex unit was more economical. A;though 125ASX2 is available from China for approc £120, most of theses are counterfiet and again would fall foul of the "easy to repair" clause. The Connex modules came out at about £120 per unit including shipping and Ihave had good support from Connex. I bought 2 and will then have three once the other two arrive (they were shipped 12th November).

If you do it like that you need to pt insulating sleeving on the legs (ie heat shrink and then attache the body to the PCB with silicon. It is easier and better to put the cap in the PCB.

In a bass with an 18 volt preamp, it should be above 18 volts. Type is irrelevant. Don't get fooled by the snake oil of orange drop or oil filled paper.

The only decent Tuner app for the Phone is the Peterson Stobe Tuner it is as much as your Snark but much more accurate.

Precision Ports are probably the leaders in flared port technology. A quick look at their website will give you an idea os the flare required.

This is the Veyron set with all controls set to 12 o'clock, the -3dB point is approximately 30Hz. I did not notice that the top end went out so far. This is the output of the preamp, from memory at the headphone output. In my opinion 35Hz seems to be the optimum -3dB point for an HPF so the concatenated filters in the amp and Thumpinator may weel approximate that.

I cannot vouch for all those manufacturers but I have measured the frequency response of both Ashdown MiBass 2.0 and the Bugera Veyron1001M and both have baked in HPF. As @Phil Starrsays, there is no need for the ultra low end, it just muddy's the sound, can set off unwanted room resonances as well as stealing the headroom from our amps.

From memory the BDI21 has a slightly mid scooped sound. However I never felt is was too scooped aand of course you can nreduce the bas/treble controls to compensate. I have the equipment to measure the output of the BDI21 and of course I have a BDI21 however both are in storage at the moment.

To be fair the BD!21 does give a nice slightly overdriven sound that you cannot get from any amp I have tried.

First thing I tried was the battery.

There is a reason oak is rarely used for guitars and I cannot remember why exactly. I will be back with either a reason or apology.

That is what I have done. I thought about it for a while, I am an electronics engineer but have a number of projects on the go. I have culled my bass collection down to 2 and as the other two are both Fender style 24" thought I would try something different and I loved the colour (now discontinued). Of course I did not have much of a chance to play it but the neck seemed chunkier than my other basses.

Well despite Hermes* best efforts the bass arrived and guess what? No output from the preamp. So I can either strip it out and go passive or fit a new preamp. Or send it back as faulty. Decisions decisions. As for the pickups I could put the ones I originally had in my Fender Aerodyne. I think they mighty sound quite good in this bass. I put DiMarzios in the Aerodyne and they improved that bass. Decisions decisions! *To be fair to Hermes, I sold a bass on here and sent it this week, next day Hermes. It arrived -----next day.

Still waiting! Hermes seem to have had a major problem in the last week with the tracking system just saying major error. It looks to be fixed now and hopefully it will arrive tomorrow. 🤞Here is a picture from Reverb.

That and a number of Aria basses are based on the Matsumoto design that included the Thunder 1/1A. It is a beauty.

I have succumbed. I have a 32" Ibanez Mezzo in Sea Foam Green on the way. Purchased on Reverb. It's not new as I don't think they do this colour in a 4. Pictures when it arrives. Oh and its my first 32". I have tried short scales but did not get on with them. You never know it may turn up in the for sale on here if I don't get on with it.